Line #21 Main/KiddieKid


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8	[[quoteright:349:[[ComicBook/{{Runaways}} https://static.tvtropes.org/pmwiki/pub/images/costume_designs_childish.png]]]]
9	[[caption-width-right:349: [[DamnedByFaintPraise Nice drawings you have there, Molly.]]]]
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11	->'''Mrs. Zales:''' Katelynn! Clothes ''on!''\
12	'''Katelynn Zales:''' ''[naked]'' I'm a turkey!\
13	'''Mackenzie Zales:''' God ''dammit'', Katelynn! I'm sorry, Deandra.\
14	'''Deandra:''' Oh no, no problem. This girl actually reminds me a lot of myself when ''I'' was two.\
15	'''Mackenzie:''' ...She's seven.
16	-->-- ''WebAnimation/TheMostPopularGirlsInSchool'', "[[Recap/TheMostPopularGirlsInSchoolS03E04 A Very Deandra Thanksgiving]]"
17
18	You turn on the TV and start watching it. Apparently, some child actor is guest starring. But wait a minute. How old is his character? He says he's X, but he's acting like X minus 5. What kind of 14-year-old gets really excited over a balloon? 10-year-olds don't ([[PeripheryDemographic usually]]) watch Creator/NickJr! Wait, a 12-year-old [[StillBelievesInSanta still believes in the Tooth Fairy]]? Why is a 15-year-old still playing with toys? To put it simply, that character is a Kiddie Kid.
19
20	Basically what happens when MostWritersAreAdults is applied, but instead of the writers writing about issues relevant to them, they try to guess what kids act like and [[OlderThanTheDemographic hit below the target age]]. On other occasions, writers may have a kid of the appropriate age in mind, but the director winds up casting a child in the role who's [[DawsonCasting much older than intended]] (this is especially prone to happening in adaptations). This may also happen when a show featuring teenagers is being [[OlderThanTheDemographic marketed to younger kids]], so they make the teenagers act like the target audience.
21
22	Website/TelevisionWithoutPity was biting about this in a recap: "Scriptwriters who have no experience with real children tend to write them as perpetual babies" and then gave an imagined scene from the then-current season of ''Series/JudgingAmy'' where the main character becomes furious that her daughter knows what the word "sex" is, as if her daughter is a kindergartener, even though the daughter (and the daughter's actress) was entering adolescence when the TWP recap was published.
23
24	In more justified cases, the kid in question has not had a conventional upbringing (e.g. they're orphans, homeschooled, or sheltered), causing them to have a naïve outlook. They may also act younger than their age due to being neurodivergent. ValuesDissonance may also play a part: in Japan, for example, childishness is considered cute (at least in girls).
25
26	Can be a side-effect of CompetenceZone. Contrast WiseBeyondTheirYears and ActingYourIntellectualAge. Related to MenaceDecay. When it's an ''adult'' behaving younger than their stated age, it's ManChild and/or OneOfTheKids. If the character actually ''is'' supposed to be very young, but looks older because of the age of the actor playing them, that's DawsonCasting.
27
28	This can be TruthInTelevision for some, since not everyone acts as mature as or shares the same interests as others.
29
30	----
31	!!Examples:
32
33	[[foldercontrol]]
34
35	[[folder:Advertising]]
36	* One ''WesternAnimation/DoraTheExplorer'' commercial had an elementary-school-aged girl who was obsessed with and kept talking about the show, which was supposed to be for preschoolers.
37	[[/folder]]
38
39	[[folder:Anime & Manga]]
40	* ''Manga/CaseClosed'': Conan, as a high-schooler trapped in a child's body, also acts rather immature from time to time, to the point where his child-age friends call him out on it.
41	* ''Anime/CodeGeass'': Subverted with Nunnally. She's introduced at age fourteen but her [[OlderThanTheyLook design]], voice, and [[TheIngenue Ingenue]] personality all suggest she's younger. Her older brother Lelouch also coddles her in part because she's [[DisabledMeansHelpless blind and partially paralyzed]]. During the second season, which takes place a year later, Nunnally's more mature side becomes more apparent.
42	* Lampshaded in ''Anime/CuteHighEarthDefenseClubLove'' with Yumoto. He is 15, but generally acts much younger than that. When one MonsterOfTheWeek turns him and his friends (who do act more like actual teenagers) [[FountainOfYouth into elementary school children]], the other boys point out that Yumoto didn't change at all.
43	* Son Goku from ''Manga/DragonBall'' looks like an 8-year-old well into his mid-teens and has the wisdom of a child even younger than that. For the record he never quite grows out of this and becomes a ManChild when he reaches adulthood.
44	* Lampshaded in regards to Arale from ''Manga/DrSlump''. Her creator intended her to be 13, but several characters have pointed out that she doesn't look or act like a teenager.
45	* Zigzagged with Wendy (12 years old) in ''Manga/FairyTail''. She is quite intelligent and regularly acts just as mature/like an OnlySaneMan to the other protagonists, who are 5-7 years older than her. But she seems to have a love for stuffed animals and toys that most 12-year-olds have outgrown. She has a rabbit backpack, [[GirlsLoveStuffedAnimals has her room filled with teddy bears]], and in one of the OVA's, she eagerly carries around a doll and wails like an infant when it is destroyed. She also sometimes shows CheerfulChild traits.
46	* ''Manga/{{Gintama}}'': Kagura zigzags this trope. She is fourteen, but how mature she is seem to vary depending on the situation. She is usually very childish, often hanging around with the neighbourhood children and playing games like bug catching and beetle fights with them, and early in the the show she seemed to be extremely naïve and gullible (though, that one might be because she just arrived on earth and didn't know anything about the planet), but other times she act her age, and is seen hanging out with other girls the same age. And then there are those times when things get really serious and she can act [[WiseBeyondTheirYears surprisingly focused, determined and level-headed for a 14-year-old.]]
47	* Midori Asakusa from ''Manga/KeepYourHandsOffEizouken'' often displays shades of this when caught up in her various fantasies, typically getting so deep into them that she starts acting them out with various items and architectural elements in a given environment like a little kid, even though she's in her first year of high school. Among other such moments, she dons a rusted bucket and pretends it's a space helmet while repairing the Motion Picture Club's dilapidated building, which she visualizes as herself mending a broken spaceship. She even wears light-up sneakers, which Tsubame lampshades as being more for kids.
48	* Nana and Narumi from ''VideoGame/{{Kimikiss}} Pure Rouge'' are 16, but they look and act half their age. In one episode, they are shown to care about romantic love by having their ubiquitous plush frogs marry.
49	* The main characters in ''Manga/KOn'' are all high school girls (and they even graduate by the series' end, then go to college in a spin-off), and yet act more like 8 or 11-year-olds than most ''middle schoolers'', yet alone high schoolers. Even Mio, the supposedly "mature" one, acts more like a very-slightly-more mature 12-year-old than anything.
50	* ''Most'' girls in ''Manga/LuckyStar'' are in their late teens, but the PuniPlush art style [[ArtisticAge makes them look younger]] and they often talk about things that grade school kids would more likely talk about (such as how to eat certain foods or what kinds of animals they'd be). Tsukasa is innocent, keeps a whole bunch of stuffed animals in her room, and mentions wearing character-print underwear. Konata and Yutaka are OlderThanTheyLook even InUniverse, and Yutaka thinks like an eight-year-old (her very first ''line'' is "Upsy-daisy"). And then there's Misao and ''her'' antics, such as making "pocky" by filling a straw halfway with chocolate milk.
51	* Aoko from ''Manga/MagicKaito'' is 16-17, but is noted to act like a little girl sometimes and [[ThirdPersonPerson her speech patterns]] are quite child-like. It seems to come from [[HeroicSelfDeprecation her lack of self-esteem, however.]]
52	* ''Franchise/{{Naruto}}'':
53	** The titular character from ''Manga/{{Naruto}}'' is a strange case. In Part 1, he is just a little bit immature, but not enough to qualify for Kiddie Kid. Thing is, all of his peers are affected by MostWritersAreAdults, so the difference in maturity by his peers qualifies him for this trope. In Part 2, he grows up and acts his age, though. The in-universe explanation is that he's [[ClassClown acting out for attention]], which may explain his lack of maturity.
54	** Himawari from ''Manga/{{Boruto}}'' is implied to be ten, but acts and is treated more like a six-to-eight-year-old.
55	* ''Anime/NeonGenesisEvangelion'': Asuka is 14 years old, but at the end of it all, she's more like a spoiled child younger than her, perhaps as a result of being severely emotionally upset by what happened earlier.
56	* ''Manga/OnePiece'':
57	** Tony Chopper may count. He's 15, and only a couple years younger than Luffy, but he can also be very cowardly and is extremely gullible. Some people on the crew, like Zoro, defend him like a child caught in a battlefield when the situation calls for it. Slightly averted by the fact he really is competent on the battlefield, but his younger instincts get in the way. Part of it might have to do with that he was 8 years old when he ate the Human-Human fruit granting him his human-like capabilities.
58	** Usopp counts as well, he's 17 but hangs out with a group of 8-year-olds and plays with them all the time.
59	** Luffy himself is 17, [[TimeSkip now 19]], years old and he certainly doesn't act like a teenager that age. He has the curiosity, love of adventures and new experiences, simple-minded logic, naivety and BrutalHonesty typical of a much younger child. Only in very rare situations when he gets pissed off or serious enough, he may show some leadership skills and actually act more mature than your average teenager. His childishness is complimented by how [[ArtisticAge he looks like he has barely reached puberty yet]].
60	** Carrot is one as well. She is at least a teenager, but act very curious, cheerful and energetic, and is naïve to the point that the aforementioned Chopper is the one acting like a CoolBigBro to her. Justified by the fact that Carrot has zero knowledge of the world outside of her birth country of Zou, so she marvels at everything she discovers like a child, and seems quite gullible.
61	* Rebecca Miyamoto from ''Anime/PaniPoniDash'' is a ChildProdigy an MIT graduate and high school teacher at age ten, [[InnocentProdigy but often behaves in ways that remind the viewer that she's still very much a child]]. However, the way she behaves at times only make her seem much younger than even eleven, as she does things like throw tantrums, hide behind things and cry when frightened, address people by made up nicknames, or scream at the top of her lungs under stress.
62	* Azusa Shiratori from ''[[Manga/RanmaOneHalf Ranma 1/2]]'' is sixteen years old but acts like a two-year-old toddler most of the time, [[https://youtube.com/watch?v=W0jbv0Zr21Y she throws violent tantrums, even bawls and screams like the big crybaby she is over some headphones Mikado wouldn't let her have.]]
63	* ''Manga/SailorMoon'': At fourteen Usagi is a carefree crybaby who loves childish things, just wants to have fun and can't keep up with the kind of schoolwork expected of her age. She eventually grows out of it over the course of the manga. Except for writing kanji, which is a RunningGag that continues even after she becomes Neo Queen Serenity, and other guardians treat it as a sign of Usagi still being a child at heart.
64	* Played for drama with Yuki from ''Manga/SchoolLive'', who is a high schooler but seems far younger. She wears a kitty-themed hat, has a backpack with angel wings on it, and is an AllLovingHero. This is also reflected with her pink hair. Yuki acts so young that she's a ReplacementGoldfish for [[spoiler:Rii's sister]], who is a ''grade schooler''. [[spoiler:Of course, this may just be one way she avoids the trauma of accepting that she's living in a zombie-infested hellhole.]] This trope is also deconstructed as [[FriendlessBackground prior to the story Yuki had no friends]] because the other girls thought she was weird.
65	* Yaya Yuiki from ''Manga/ShugoChara'' is around 10-11, but she often acts like a BrattyHalfPint. However, this is actually {{Justified}} in the story itself-- this behavior comes from her InfantSiblingJealousy towards her younger brother. She desires to be loved and coddled by the people around her, so she acts like a big baby to get attention.
66	* ''Manga/TimeStrangerKyoko'' reveals Ui to be this upon her awakening. Justified, as Ui has been in suspended animation for years, and she has never gained the chance to mature. She's like a young child in an older teenager's body, who goes about her heart's desire like any child would.
67	* Rebecca Hopkins from ''Anime/YuGiOh'' seems like she's playing this trope straight at first. She's twelve, yet she's still carrying a teddy bear around, talks to it and uses it to talk for her, dresses childishly, and looks like she's about to throw a temper tantrum when Yugi get's the upper hand in their duel. However, it's quickly revealed that all this is an ''[[DeliberatelyCuteChild act]]'' to throw off her opponents. In her next appearance a couple seasons later, she dropped the little kid act and started acting her age. For the most part anyway.
68	[[/folder]]
69
70	[[folder:Comic Books]]
71	* This is intentionally done with Jughead from ''ComicBook/ArchieComics''. He's rather immature for a teenager his age. He even mentioned in [[Radio/TheAdventuresOfArchieAndrews the 40s radio show]] that he was fond of ''Howdy Doody'', which was aimed at kids almost ten years his junior. His immaturity was originally shown off by his hat - in the early 20th century young boys would often cut up their father's old fedoras - however the fact has been lost by audiences over the years. Many think it's similar to a Burger King crown though, which has a similar effect.
72	* ''ComicBook/{{Foxtrot}}'': Jason (a 10-year-old TVGenius) is terrified of girls getting mushy with him, sometimes even dropping the term "cooties" as though it were an accepted scientific phenomenon. Occasionally lampshaded by his usual target and SitcomArchNemesis Eileen whenever he's planning a stupid prank worthy of [[ComicStrip/CalvinAndHobbes Calvin]]. [[CharacterDevelopment He has gotten a little better in this regard over the years.]]
73	-->'''Eileen:''' Um, Jason, are you in the fifth grade because you skipped a few years?
74	* Molly from ''ComicBook/{{Runaways}}'' acts younger than her true age, [[TheFakeCutie intentionally]], because it gets her attention and makes her feel loved. Plus, it gets adults to underestimate her. Which is useful, because if the emphasis is on the "cute" in CuteBruiser, then people aren't expecting it when the cute little girl tosses them across the block (just ask ComicBook/{{Wolverine}}). This did lead to a brief storyline in one run where she wonders if she's doomed herself to ''always'' be seen as this by the rest of the group, however, and contemplates whether she should take a friend's FountainOfYouth offer.
75	[[/folder]]
76
77	[[folder:Comic Strips]]
78	* ''ComicStrip/ForBetterOrForWorse'' has a few examples due to WritersCannotDoMath:
79	** Downplayed since the characters are toddlers, but 2-3 year old Richard and later his sister Leah are treated more like infants. They still drink from bottles despite kids that age drinking from sippy cups, and Richard still eats mushed up food and speaks in simple babble such as "Ya-Gah" despite kids that age eating the same food as adults and speaking at least 2-3 word sentences. While Richard later ages into a normal elementary school age child, Leah was PutOnABus along with the rest of the family.
80	** April behaved like a toddler from 2-9, to the point where she still physically looked like a toddler and spoke mispronounced words.
81	** Michael and Deanna's son Robin acted more like a baby than a toddler, rarely speaking in sentences, going through PottyFailure well after he was fully toilet trained and gullible (he infamously ate a mud pie believing it was chocolate ''after he watched Meredith make it.'').
82	** All of the kids said "and" without pronouncing the D at the end even when they were teenagers. Most kids in real life outgrow this type of speech impediment after they finish kindergarten.
83	[[/folder]]
84
85	[[folder: Fan Works]]
86	* ''Fanfic/DanganronpaKommSusserTod'': The cast are high schoolers, and most of them do act maturely. Chie, on the other hand, acts incredibly childish as a result of being sheltered from sensitive topics such as death, what with her childish obsession with frogs and immense attachment to [[CompanionCube her "Kero-chan" bag]].
87	* PlayedForDrama in ''Fanfic/InfinityTrainBlossomingTrail'': Hop is usually depicted as a pre-teen who is capable of handling himself and is off on his own adventure to be a great Trainer. However, by the time we cut back to him when he's been stuck in The Fog Car (aka ''Franchise/SilentHill''), he's somehow mentally regressed to a six or seven-year-old boy, acting affectionate and childlike to [[VideoGame/SilentHillHomecoming Alex Shepherd]] to the point he's asking for bedtime stories and drinking chocolate milk and butter cake before bed. This is presumably due to what Walter and Henry wish to enact for a ritual, needing seven people to embody certain aspects, and Hop represents "Delight".
88	[[/folder]]
89
90	[[folder:Films -- Animation]]
91	* In ''Literature/AlicesAdventuresInWonderland'', Alice is 7 years old, so her personality makes sense. Most adaptations, including Disney's ''WesternAnimation/AliceInWonderland'', {{age lift}} her to 10-12, so in these versions her personality comes off as slightly immature for her age. It makes more sense for a 7-year-old to be utterly bored by books without "pictures or conversations," or to cry a big pool of tears when she finds herself grown into a giant. The fact that most of these film adaptations then cast a girl who is more in the range of 14-16 makes matters even worse still.
92	* ''WesternAnimation/MonstersInc1'': Zigzagged with Boo, who is implied to be about two since she's potty trained but clearly still a toddler. Her vocabulary is more like an eighteen-month-old consisting mostly of babbling, but her drawing skills are rather advanced for a two-year-old.
93	* Done intentionally with Peter from ''WesternAnimation/PeterPan''. He has a VagueAge but seems to be nearing adolescence. However, he acts like a much younger boy than his YoungerThanTheyLook appearance suggests. He doesn't want to grow up and avoids maturing at all costs. In the book, it describes him as a boy who has not yet lost his first baby tooth, which would reasonably put his age at about 6 or 7 at most.
94	* In ''WesternAnimation/TurningRed'', this is downplayed. While Mei is your typical junior high girl who is experiencing the [[HormoneAddledTeenager awkward emotions of puberty]], crushes on [[LikesOlderMen older guys]], idolizes a BoyBand with K-pop and Western influences, and often separates herself from her family in favor of her friends, part of her is still a little girl, as she carries around a ''Tamagotchi'' and [[GirlsLoveStuffedAnimals decorates her room with stuffed animals]], one of which in particular, Wilfred, is her SecurityBlanket which she still sleeps with.
95	[[/folder]]
96
97	[[folder:Films -- Live-Action]]
98	%% * Most children in the 2009 ''WesternAnimation/AstroBoy'' movie act a few years younger than their stated ages.
99	* Robin in ''Film/BatmanForever''. The part was written for someone much younger than Chris O'Donnell, leading to jarring moments, such as Alfred convincing an obvious twenty-something to stay with Batman / Bruce Wayne by bribing him with a cheeseburger.
100	* ''Film/ChildsPlay2019'' aged Andy Barclay up to 13 (from 6 in the original film). It's hard to imagine a 13-year-old boy being excited over a doll like Chucky, never mind that it's {{creepy\|Doll}}-[[UncannyValley looking as hell]] even before it goes homicidal.
101	* In ''Film/DownInTheDelta'', the autistic toddler Tracy still sleeps in a crib, even though it's noted that she's too old for it.
102	* ''Film/{{Fred}}: The Movie'' ages the titular 6-year-old {{Cloudcuckoolander}} to a teenager, but he acts the exact same as in the [[WebVideo/{{Fred}} web series]].
103	* In ''Film/{{Jack\|1996}}'', Creator/RobinWilliams plays a 10-year-old kid with a disorder that makes him age at 4x the rate. He, however acts like he's five, in part because he was sheltered and homeschooled until fifth grade.
104	* ''Film/JurassicWorld'': Gray's character was supposedly written as autistic at first. While this wasn't specifically mentioned in the final film, it explains his Calvin-levels of excitement at seeing dinosaurs.
105	* Played tragically in ''Film/{{Logan}}''. Eleven-year-old Laura acts more like a child several years her junior due to her poor upbringing. In one scene, she begins to eat mashed potatoes with her hands, and even when she's given a fork, she doesn't know how to hold it correctly.
106	* In ''Film/TheMajorAndTheMinor'', Creator/GingerRogers must pretend to be 12, which she does by acting like she's 6.
107	* Possibly why Denny from ''Film/TheRoom2003'' acts so weird--he appears to be in his late teens or very early twenties, and was played by a [[DawsonCasting 26-year-old]], but acts like a (strange) little kid who's just on the cusp of puberty and doesn't quite know how to handle it.
108	* In ''[[Film/Shazam2019 SHAZAM!]]'' and ''Film/ShazamFuryOfTheGods'', teen Billy as his own self is quite mature. When he is his Shazam self though, he acts and talks in a much less mature manner.
109	* In TheFilmOfTheBook ''Tom's Midnight Garden'', Tom becomes this. While the book doesn't specify any age, it's pretty clear that he's a little boy. However, in the film, he is very obviously a young teen, and the actor who plays him, Anthony Way, is fourteen at the time of filming. Consequently, Tom's games in the garden with Hatty, while age-appropriate for the little boy depicted in the book, come across as rather childish for the young teenager we see in the movie.
110	* Susie in ''Film/TooMuchTheRobotWithAHeart'' appears to be around 10 or 11, but acts very immature and childish for her age. The main plot is kicked off by her running away from home to be with her robot, who is now her best friend.
111	[[/folder]]
112
113	[[folder:Literature]]
114	* The characters in ''Literature/TheAdventuresOfArchieReynolds'' don't act like the 12-year-olds that they are. Their behavior is consistently bizarre and childish, and Archie is seen getting excited over a water pistol, something he's somehow never seen before.
115	* An Creator/AgathaChristie short story uses this as a plot point: a teenager who gets really excited about showing a magic trick involving hiding a diamond to win a bet ends up ''really'' losing the diamond. It turns out she's part of a gang of jewel thieves, using her OlderThanSheLooks appearance to appear truly innocent. The detective who solves the case sums it up by saying "Children aren't that childish."
116	* Holden from ''Literature/TheCatcherInTheRye'' is a mild example. He's seventeen but even he admits that he often acts as mature as a twelve-year-old.
117	* In the ''Literature/ConfessionsOfGeorgiaNicolson'' series, Georgia's younger sister Libby could qualify as this as she does not age along with Georgia, though she should be about six by the end of the series. She still isn't toilet-trained, [[BabyTalk speaks only in toddler-gibberish]], still uses a pushchair, and [[NoSocialSkills her social skills only extend to shouting embarrassing things at passersby and cheerfully torturing her male "fwends" at nursery school with make-up and garden implements]].
118	* In the ''Literature/DiaryOfAWimpyKid'' books, Greg's friend Rowley is one -- although he's in early middle school, he prefers to hang out with six-to-eight-year-olds, be it holding a birthday party at the local SuckECheeses or having several kids from karate class for a sleepover.
119	** In "Diary Of An Awesome Friendly Kid" he mentions his mom helps bathe him. Most children (aside from special needs kids) learn how to do this when they are early elementary school age.
120	* ''Literature/EleanorAndPark'':
121	** Eleanor’s brother Ben is eleven (later twelve) and still plays with toy cars and doesn’t seem to hang out with the other boys his age. Eleanor actually hopes that he’s a late bloomer, as there’s no room for two of them to be teenagers in their DysfunctionalFamily.
122	** Her other brother, two-year-old Little Richie, seems to act more like a baby. He never speaks and still rocked and carried around by their sister Maisie.
123	* {{Subverted}} in the ''Literature/HarryPotter'' books. In the earlier books, Ginny Weasley was only one year younger than the Trio, but was treated and described as though she were several years younger. In later books, it's made clear that she had always had a stronger personality and was more shy due to both her childlike crush on Harry and being the Weasley family's only daughter among several boys, so she starts acting more outspoken as time passes. You can debate all day whether this was a {{Retcon}} or planned all along, but either way the subversion is there.
124	* ''Literature/TheInstitute'': Avery Dixon, one of the gifted kids taken by The Institute. He is ten, but he both [[OlderThanTheyLook looks]] and acts at least several years below that age (in his first scene he throws a tantrum like a toddler). Lampshaded by the other kids, with Kalisha theorizing that it's because Avery is a very powerful telepath, meaning he could live a pretty sheltered life and never had to learn social skills needed to pick up cues (like judging what people say by their expression and tone of voice).
125	* In the first half of ''Literature/LittleWomen'', 13-year-old Beth generally acts like a younger child, especially in the way she still plays with dolls and treats them as if they were alive. All four of the March sisters are innocent for their ages, since their parents believe in letting children be children as long as possible, but it especially stands out with Beth.
126	* In ''Literature/NoOneNeededToKnow'', Heidi thinks that her sixteen-year-old Autistic brother Donald acts more like a nine- or ten-year-old. He still likes make-believe games involving pirates, superheroes, and aliens, which eleven-year-old Heidi is already starting to outgrow.
127	* in the '' Literature/RamonaQuimby'' series, Ramona herself tends to behave as someone her age should, as is also the case for her sister Beezus and best friend Howie. Such is not the case, however, with Howie’s little sister Willa Jean. In the first book, Ramona is four years old and Willa Jean is around two, able to walk and say a few words. By the last book, Ramona is in the fourth grade while Willa Jean is around four or five, able to speak better but still “messy” and too young for school, with a toddler’s tantrums, etc.
128	* In ''Literature/TomsMidnightGarden'', Hatty is one of these at one point. When she falls out of a tree, her aunt remarks that she shouldn't even be climbing trees at her age. Justified as Hatty is socially isolated, being ignored (at best) by her relatives, with her only friend being a [[spoiler:time-traveling]] little boy.
129	* ''Literature/{{Wicked}}'': Fiyero's nine-year-old daughter Nor still [[StillSucksThumb sucks her thumb]], has a [[ElmuhFuddSyndwome lisp where r's are pronounced like w's]], and generally acts younger than she is. In Nor's case, it's just her as other kids don't act this way; it's implied Nor is spoiled.
130	* In ''Literature/WutheringHeights'', Edgar and Isabella Linton are introduced fighting over who gets to hold the family lapdog like a pair of 5-year-olds, Edgar crying and Isabella throwing a shrieking tantrum. Edgar is 15 in this scene and Isabella is 11. Of course, this was presumably an intentional choice to show the weak, spoiled nature of the Linton family. Also, it's only described secondhand by [[TragicVillain Heathcliff]], who despises the Lintons and might be an UnreliableNarrator.
131	[[/folder]]
132
133	[[folder:Live-Action TV]]
134	* When they're not interested in romance, the ''Series/BigTimeRush'' band can be rather goofy. In one episode, Kendall tries to tell his mother that the guys are mature...while Logan and James are playing with chicken nuggets shaped like dinosaurs in the background.
135	* Cindy from ''Series/TheBradyBunch'', much to the annoyance of her actress Susan Olsen. The final season episode "The Snooperstar" had her obsessed with becoming the next Creator/ShirleyTemple and singing "On the Good Ship Lollypop," despite being 12 years old. It was later revealed that this episode was originally planned for much earlier in the show's run, but ExecutiveMeddling kept it until the last season, when it no longer made sense.
136	* Most early LongRunner TV shows where a kid main character's actor outgrew the original premise, most infamously the 1950s TV series based on ''ComicStrip/DennisTheMenaceUS''; contemporary ''Series/LeaveItToBeaver'' was another case. Writers and showrunners accustomed to radio (where, as in animation, children were often voiced by adult women) had a learning curve to deal with.
137	* ''Series/GetSmart'': In one episode, a weapon is meant to regress people's minds into the mind of an eight-year-old, yet when the Chief is hit with it, he takes a nap. Eight-year-olds don't usually take naps unless they're sick or sleep-deprived.
138	* ''Series/DoctorWho'' had characters like this in the early years:
139	** Susan in ''Series/DoctorWho'' suffered from this in some stories, such as getting far too excited about going paddling in the sea and getting a new dress in "The Keys of Marinus" and her general childish reactions in "The Daleks" (displaying disproportionate screaming, rolling-around-on-the-ground terror when the Daleks allow her to return to the TARDIS through a spooky-looking nuclear wasteland containing no living things and confirmed to be safe, and giggling uncontrollably at the Daleks' funny voices). Part of the reason her actress Carol Ann Ford left the role so early was because she was frustrated with her character being written this way, although it can be {{Justified}} by the fact that Susan isn't human, and is from a species that is considered a kid until they're hundreds. Her replacement companion, Vicki was written convincingly like a clever fourteen-year-old.
140	** This was sometimes done intentionally in serials aimed at younger audiences in order to allow older characters to serve as AudienceSurrogate characters. For instance, Steven (in his early 20s) and Dodo (a teenager) both act quite childish in "The Celestial Toymaker", doing things like laughing at clowns making the other jump, and getting cross with a creepy schoolboy character for cheating, being rude and not sharing sweets. It's a sharp contrast to their behaviour in "The Ark" and "The Savages", science fiction stories aimed at older children and teenagers, where they act their ages.
141	* In the ''Series/{{Emergency}}'' episode "Alley Cat," the firemen rescue a girl from a plane crash who looks about twelve, but acts closer to four. She calls her parents Mommy and Daddy, refers to her injured, unconscious father as "asleep in the plane," does an impression of a lion, and even calls her mother's bandages a "funny hat" and asks if she can have one. The adults around her act accordingly, with lines like "Why don't you one, two, three, four drink your milk?" The children of ''Emergency!'' usually act at least somewhat like their age, so her behavior is jarring.
142	* Played with in ''Series/GoodLuckCharlie'' with P.J. as a fan The Gurgles, a singing group for toddlers and TV show of the same name.
143	* Ben from ''Series/{{Friends}}'', Ross' son from a prior marriage. The more he showed up in later seasons the more "the same age" he remained, even though the actor playing him was obviously getting close to being 12, rather than being young enough to actually ''believe'' in Santa Claus, for example. He was all but forgotten after Emma was born, and only received mentions in passing.
144	* Scott from ''Series/HipHopHarry''--the actor portraying him is a teenager, but he acts very childish; he doesn't know how to cross the street by himself, he doesn't know what a lot of things are, and he thinks it's a good idea to feed hot dogs and ice cream to a hamster.
145	** Sometimes, when children's shows want to portray {{Audience Surrogate}}s who can do more complicated things than their target audience can, like perform intense choreography or explain what it's like to live with a disability, they'll bring in an older kid who tends to fill this role. While ''Series/SesameStreet'' and ''Series/BarneyAndFriends'' have each done this a couple of times, Kiddie Kid moments happen fairly frequently on ''Hip Hop Harry'', because the child actors on that show are hip-hop dancers who are all at least nine years old, and they're playing to preschoolers.
146	%% * Reese from ''Series/MalcolmInTheMiddle'', in the later seasons, especially with regards to school and authority figures in general. Despite being over a year older than Malcolm, in many contexts he seems like Malcolm's several-years-younger brother. <-- That doesn't explain how he acts childish.
147	* Boyd from ''Series/LastManStanding''. One episode lampshades it, in which he, as a 9-year-old, asks an adult to put holes in a box so his stuffed animals can breathe. Another episode has him, at age 10--meaning, a 4th or 5th grader--, shrieking in fear and running away from cheesy Halloween decorations in a school-run Haunted House, and later whimpering about facing the "scary monsters" like he's in pre-school.
148	* Dewey from Series/MalcolmInTheMiddle starts off the series as a 1st grader (making him 6 to 7 years old) however in several episodes he behaves like someone way younger than his age. For example, throwing a tantrum when his parents won't buy him a "Sleepytime Herbie" doll.
149	* The ''Series/MidnightCaller'' episode "Do You Believe in Miracles?" has a thirteen-year-old girl who spouts adorable one-liners like "Maybe he was grumpy because [[EightiesHair his hair]] hurt. It looked really sharp!" Surprising, since other episodes have kids her age who act more realistically adolescent.
150	* Screech from ''Series/SavedByTheBell''. He is the character with the least character development[[note]]which is saying A LOT for a show not exactly known for deep, fleshed-out characters to begin with[[/note]], and the goofiest to boot. It doesn't help that his actor is a few years younger than his costars, yet his character is the same age on the show.
151	* ''Series/{{Smallville}}'': In one episode, Lana Lang is haunted by the ghost of a childhood friend, Emily. Emily was stated to be 10 years old, but she looks and acts much younger, with handwriting that looks more like a 2nd grader and interests and speech patterns more typical of a 4- or 5-year-old. In flashbacks, Lana appears to have been an improbably immature 10-year-old as well, since she didn't act very differently from Emily.
152	* In the ''Series/StarTrekTheNextGeneration'' episode "Rascals", Picard, Ro, Keiko, and Guinan are [[FountainOfYouth de-aged into twelve-year-olds]]. They have the mentalities of adults, but when they (with the exception of Keiko, who never tries to act like a kid) try to act like children, they behave more like six-year-olds than twelve-year-olds. Picard, in an attempt to persuade a Ferengi to let him see Riker, stamps his foot and shouts, "Now!" over and over for instance, and Ro and Guinan jump on a bed.
153	* PlayedForDrama in ''Series/TheTwilightZone2019'' episode "The Wunderkind," in which Oliver Foley, an eleven-year-old [=YouTube=] star, becomes President of the United States thanks to a savvy campaign manager. His first official act as president is to demand that everyone get free video games; he throws wild temper tantrums; and he refuses to get a female dog because GirlsHaveCooties. It's somewhat [[JustifiedTrope justified]] in that Oliver is a SpoiledBrat with ExtremeDoormat parents who coddle him endlessly and grant his every whim, so he feels no need to mature--and it's made worse when he fills his cabinet with [[YesMan sycophants]] who bend over backwards to indulge him. [[spoiler: Oliver's extreme immaturity ends up killing his campaign manager, as his fear of doctors makes him enact a law which states that ''only'' children can be surgeons, leading to a bored ten-year-old slicing the manager to bits on the operating table.]]
154	* Cat Valentine from ''Series/{{Victorious}}''. Despite being a teenager in performing arts high school, Cat's demeanor is pretty much like a child with her baby voice, extreme naivety, and impulsive nature. Some of her most immature moments involve swallowing keys that were given to her and wanting to lick red lasers because she was curious about the flavor.
155	[[/folder]]
156
157	[[folder:Music]]
158	* "I Saw Mommy Kissing Santa Claus" was originally sung by a thirteen-year-old. The song, however, is clearly supposed to be sung by a far younger child. The wording and even the premise are too immature for most tweens.
159	[[/folder]]
160
161	[[folder:Theatre]]
162	* In the original story of ''Literature/TheNutcracker'', Marie is seven years old. But in most productions of [[Theatre/TheNutcracker the ballet]], [[AdaptationalNameChange Clara]] is cast with an eleven- or twelve-year-old dancer, or even with [[DawsonCasting an adult ballerina playing her as about twelve]], since the role's dancing demands are typically too much for a younger child. This means the audience needs to suspend their disbelief that a nearly teenaged girl should be so enamored of a simple nutcracker doll.
163	[[/folder]]
164
165	[[folder:Video Games]]
166	* Alba in ''VideoGame/AlbaAWildlifeAdventure'' is supposedly ten or eleven, if the opening cutscene in which you briefly play as her as a baby, followed by narration saying "ten years later" are clues to go by. However, she is super short, smiles all the time, and acts like more like a preschooler than a fifth grader. The way players make her nod her head to say yes and shake it to say no make her come across as super childish, and she carries around a picture book with pictures of animals and a sound effect button to hear what they sound like, the kind of gimmicky book a little kid would own.
167	* ''VideoGame/CorpseParty'': Yuka is meant to be 14 years old, but not only acts, but even [[OlderThanTheyLook looks like she's in elementary school]]. Justified by [[SpoiledBrat having her parents eating out of her hand and never getting any maturing life lessons]].
168	* In ''VideoGame/EnsembleStars'', Tori looks and acts [[OlderThanTheyLook much younger than he is]], but at least that's part of a deliberately cutesy act for him. Mitsuru, on the other hand, just naturally acts more like a primary schooler than the 15-to-16-year-old he is in canon. It says something when he sees Tomoya and Hajime as an older brother [[DudeLooksLikeALady and sister]] when even they come across as younger than they really should.
169	* ''Franchise/FireEmblem'':
170	** In the original ''VideoGame/FireEmblemShadowDragonAndTheBladeOfLight'' and ''[[VideoGame/FireEmblemMysteryOfTheEmblem Mystery of the Emblem]]'', [[TheHero Marth]] is rather naive and acts decidedly childishly, despite being 16 in the former and 19 in the latter. [[DependingOnTheWriter This was changed in the first game's remake]], in which he acted WiseBeyondHisYears, before the third game's remake reverted to his original personality, albeit somewhat toned down.
171	** In the Japanese version of ''VideoGame/FireEmblemAwakening'', [[Really700YearsOld Nowi]] the [[OurDragonsAreDifferent Manakete]], who looks about 11 or 12, acts like she's about 9 or younger, complete with ThirdPersonPerson dialogue, [[spoiler:in contrast with her daughter Nah who looks like she is barely 8 and [[WiseBeyondTheirYears acts at least twice that]]]]. The English version changes this somewhat, where she has HiddenDepths and is more mature than she lets on.
172	** From the same game, [[TheHero Chrom]]'s little sister [[TomboyPrincess Lissa]] is 16, still afraid of a multitude of things, talks and acts childishly, has a high-pitched voice, and is a prankster. Depending on which ages the official profiles are using, she can be ''[[OlderThanTheyLook 18]]'' post-TimeSkip.
173	* In ''VideoGame/HeavyRain'', Jason and to a lesser extent, Shaun, are incredibly stupid for their age. Near the beginning of the game, Jason, age 10, is alone with Ethan in the mall. Ethan immediately tells him not to wander off, only for him to ignore his father, wander around in a jam-packed mall, and leave the place to watch TV at a nearby store. When Ethan finally sees him across the street, Jason '''runs without looking for cars and gets hit and killed'''. Two years later, when Shaun is the same age, one level is basically Ethan taking care of Shaun on a typical school afternoon. This includes Ethan making him a snack when at his age he could just look for something himself, sending him to bed at 8PM at the age where boys go to sleep between 9PM-10PM, and Shaun asking for his precious teddy bear. Shaun's case is a little TruthInTelevision since he comes from a broken family and coping with his brother's death, Shaun could complain to his mom and Ethan would lose custody if he didn't give as much care as Shaun expected, but he isn't completely excused. Apparently in earlier versions of the game's production, Jason was going to be 4 or 5 instead of 10, which would've made his behavior more understandable, but Sony felt that the death of a child that young would've been too tragic for players. He was aged up but his behavior wasn't corrected to match.
174	* In ''VideoGame/HonkaiImpact3rd'', the twins Rozaliya and Liliya Olenyeva are officially between 12 and 14 years old, but their favourite pasttime, at least in the Dorm mode, is hide-and-seek. In one such interaction, Rozaliya guilt-trips their slightly older, and far more mature, fellow orphan Bronya (who'd rather play video games) into playing hide-and-seek with her.
175	* ''VideoGame/TheIdolmaster''
176	** Main Branch: At age 14 Iori carries a stuffed bunny wherever she goes, although said bunny makes less appearances in the 2nd Vision games after she turns 15, Yayoi is [[IncorruptiblePurePureness very]] [[ThePollyanna innocent]] and acts more like a grade schooler than a 13/14-year-old, at the age of 12 Ami and Mami thought that receiving a reply from a letter to Santa is definitive proof of his existence, 16-year-old Yukiho still believes in Santa and 15-year-old Chihaya is also implied to as well, and 17-([[ManChild later 18]])-year-old Takane enjoys shows intended for preschoolers, [[CloudCuckooLander although this is treated as unusual]].
177	** ''[[VideoGame/TheIdolmasterCinderellaGirls Cinderella Girls]]'': Chika Yokoyama genuinely believes Usako, Arisu's puppet, is really alive and talking. Chika is 9.
178	** ''[[VideoGame/TheIdolmasterSideM SideM]]'': Pierre is 15 but much like Yayoi is incredibly innocent and naive for his age. Kanon acts excessively cutesy for a 9-year-old boy and like Iori is often seen with a stuffed bunny, but this may just be because he's InTouchWithHisFeminineSide.
179	* ''VideoGame/IWasATeenageExocolonist'': Nomi-Nomi is into EntertainmentBelowTheirAge, generally acts like a overenthuastic child despite debuting at thirteen years old, is prone to CuriosityIsACrapshoot during expeditions and is shorter than anyone else among the PlayerCharacter's peers.
180	* ''VideoGame/TrailsSeries:''
181	** Tita Russell from ''VideoGame/TheLegendOfHeroesTrailsInTheSky'', not so much for her behavior (though she still has her moments of immaturity), but rather, the way the other characters treat her. She's 12, and a GadgeteerGenius prodigy at that, but all of the characters talk to her in an almost condescending way like they would a much younger child, including Estelle and Joshua, who are only four years older than her! This forms a substantial part of her CharacterDevelopment, as being treated like a kid frustrates her to no end, and she takes on increasing responsibility and danger to prove to the competent adults that she can pull her own weight with the best of them.
182	** Similarly, Millium in ''VideoGame/TheLegendOfHeroesTrailsOfColdSteel'' is supposedly 13 but acts more like a six-year-old, often acting like an impulsive, hyperactive child and tiring herself out.
183	* Sherry Birkin in the original ''VideoGame/ResidentEvil2'' is supposed to be 12, but her personality, voice, and even her size are all more suited to a 6 or 7-year-old child. She's still rather small for her age in the remake, but sounds and acts more like a real 12-year-old.
184	* Bowser Jr. from the ''Franchise/SuperMarioBros'' franchise doesn't have his age stated, but he appears to be somewhere around eight to ten years old. In his early appearances in spin off games like ''VideoGame/MarioKart'' and ''VideoGame/MarioGolf'', he would throw a tantrum and cry ''loudly'' as if he was four years old. Baby Mario and Baby Luigi, both being younger than Bowser Jr., don't cry as loud if they lose a game and they mostly show distress instead, while Diddy Kong, who appears to be about the same age as Junior, rarely cries loudly and usually just shows disappointment. Junior's SoreLoser attitude was toned down in later games where he now expresses anger and frustration when losing a game.
185	[[/folder]]
186
187	[[folder:Visual Novels]]
188	* Deconstructed in ''VisualNovel/UminekoWhenTheyCry''. The fact that 9-year-old Maria acts younger than she is causes her to be bullied in school, and infuriates her mother to the point of abuse. In the first four arcs, other characters often [[LampshadeHanging lampshade]] how young she acts despite her age. It's implied that Maria's behavior stems at least partially from some form of learning disability.
189	[[/folder]]
190
191	[[folder:Web Animation]]
192	* ''WebAnimation/TheMostPopularGirlsInSchool'': [[TooDumbToLive Katelynn]] [[ExtremeOmnivore Zales]] is seven, but she acts like she's two. The dialogue regarding that matter is at the top of this page.
193	[[/folder]]
194
195	[[folder:Webcomics]]
196	* Nina Delacroix from ''Webcomic/EerieCuties'' is 14, but for most of the strip she looks and acts like as if she was half of that age. [[spoiler:Justified in that her development has been deliberately stunted to prevent her from manifesting the reincarnated spirit of an ancient and deadly vampire queen. And then subverted when it turned out her older sister was the chosen one all along.]]
197	* Sarah of ''Webcomic/LasLindas'' is the youngest and most emotionally immature of the cast (not counting Digit, the AI). Her age has never been fully established (she's somewhere between late teens and early 20s), so this trope or ManChild could apply.
198	[[/folder]]
199
200	[[folder:Web Videos]]
201	* WebVideo/TheNostalgiaCritic admits to being bullied at school for acting younger than his age. This serves as {{foreshadowing}}, as later he realizes from a bad phone call to a director that he's not acting like a normal twenty-eight-year-old man should.
202	* Jeffy Jeffy from ''WebVideo/SuperMarioLogan'' starts off as a preteen, then teenager, and finally a young adult, yet plays with children's toys and acts like a hyperactive five-year-old. Not to mention, he still wears diapers.
203	* Mocked by WebVideo/DrewGooden in his [[https://www.youtube.com/watch?v=bibPGJBDILQ&t=981s review]] of ''Christmas Mail'', where he singles out the parents in the background watching their fifteen-year-old son play on a jungle gym like he's a little kid.
204	-->'''Drew (as parents)''': I'm so proud of our almost adult child!
205	[[/folder]]
206
207	[[folder:Western Animation]]
208	* ''WesternAnimation/AmericanDad'': Steve Smith is a DependingOnTheWriter version of this. While most of the time he acts like your stereotypical HormoneAddledTeenager, some episodes give him childish mannerisms and interests such as toys and playing pretend. He even still has a babysitter in one episode, in spite of being around the same age as her.
209	* ''WesternAnimation/AsToldByGinger'': Macie turns into one in the episode "Family Therapy" after her parents start treating her like a four-year-old after forgetting her birthday. She starts to enjoy playing on a Rocket Tykes Swingset and a My First Jungle Gym, going to the local SuckECheeses, has her thirteenth birthday party at a petting zoo (with kiddie-style decorations), and even starts dressing more like a four-year-old. Ginger notes that Macie is liable to get bullied if this continues, and repeatedly tries to fix the problem. Macie gets annoyed at Ginger's intervention (and ends up being proven right when the most popular kids in school think the petting-zoo party is some sort of post-modern statement and dub it the coolest thing they've ever seen). In an interesting subversion of the trope, the episode ends with Macie admitting that she ''knows'' this behavior is far too juvenile for her: she's just making up lost time with her parents, and assures Ginger that she'll be talking with them about treating her like a teenager soon. Given that she ends up back to her old self, this presumably works.
210	* In ''WesternAnimation/AtomicBetty'', Sparky is supposed to be the same age as Betty, but he acts way more childish and irresponsible than her. He frequently gets distracted on missions by food or other exciting things, and in "Toy Hystoria" he bawls like a baby over the fact that he won't be getting any Christmas presents since Santa was kidnapped.
211	* ''WesternAnimation/TheBatman'': Batgirl is high school aged, but she acts ([[OlderThanTheyLook and looks]]) more like a middle-schooler would, especially with how she bickers with Robin, who's at least a couple years younger than her. Though she does mature noticeably in the fifth season when she's a college freshman.
212	* ''WesternAnimation/BeavisAndButtHead'': For a teenager, [[DumbBlonde Beavis]] is shown to be quite immature. In "[[Recap/BeavisAndButtheadS5E01HeldBack Held Back]]", he enthusiastically joins the other kindergarteners in finger painting and coloring. And in "[[Recap/BeavisAndButtheadS6E09Babysitting Babysitting]]", he enjoys himself by playing the toys that are meant for the little children, who he's supposed to be babysitting.
213	%% * Gene Belcher from ''WesternAnimation/BobsBurgers'', is this combined with {{Cloudcuckoolander}}.
214	* ''WesternAnimation/{{Braceface}}'': In the episode "Act Your Age", 14-year old Sharon dates a boy named Pablo, who turns out to be only 12 years old. However, at several points in the episode, he behaves like someone younger than that. He wears shoes with velcro (which most boys his age don't); his 13th birthday party has clowns and loot bags (this last one is even lampshaded by Sharon, who mentions that her brother, who's younger than he is, doesn't do this). Most boys that age would think they were too old for something like that. However, this is justified to show how much younger he is than Sharon.
215	* ''WesternAnimation/TheClevelandShow'': Something is not right with Cleveland Jr. Most people just view him as an optimistic nerd, but he also can't let go of some childhood memories. He still plays with his "Larry the Leopard" stuffed animal, and acts as though it's a real person, he often gets easily tricked by Rallo, who is ''5 years old'', and he wants his dad to kiss him goodnight. This is [[LampshadeHanging explicitly stated]] as weird in-universe, and others his age typically avert this trope [[RuleOfFunny unless it's funny]].
216	* ''WesternAnimation/CodenameKidsNextDoor'': Almost every member of the titular group is an exaggerated stereotype of children, even the nine- to twelve-year-old ones who should be more mature. They all love soda pop, [[StockYuck hate vegetables]], and act rather innocent.
217	* ''WesternAnimation/DextersLaboratory'': Dee Dee, who is elder to her titular brother, is implied to be a sixth grader. This would put her actual age somewhere between ten and twelve. However, she tends to behave as if she were much younger than Dexter, always [[TheThingThatWouldNotLeave invading his secret laboratory]], acting nosy to Dexter's business, and crying quickly over being snapped at. In terms of her more child-like aspects, she's a GirlyGirl who performs ballet, loves the color pink, [[AllGirlsLikePonies ponies]], and [[GirlsLoveStuffedAnimals stuffed animals]].
218	* ''WesternAnimation/DCSuperheroGirls2019'': The Tween Titans, this continuity's Teen Titans, behave more like six-year-olds than preteens.
219	* ''WesternAnimation/FamilyGuy'': Chris Griffin, DependingOnTheWriter. Some episodes will have Chris behave like a normal teenager, which has become more common in recent seasons, and others will make him easily entertained and somewhat shallow minded, as well as playing childish tricks anybody his age could see through, at age 15. Since his father is a ManChild, and since he is very similar to him, it may run in the family.
220	* ''WesternAnimation/{{Futurama}}'': Cubert is a 12/13-year-old who looks and acts like he's around 9. A plot point of one episode was about how he felt the need to imitate everything he saw on his favourite TV show, even if it didn't make sense.
221	* ''WesternAnimation/HeyArnold'': Harold is one of the most immature characters in Mr. Simmons' 4th grade class, as he often cries and has been shown playing with a Barney Expy doll on multiple occasions, and yet he's actually ''four years older'' than the rest of his class, since he celebrates his bar mitzvah in one episode.
222	* ''WesternAnimation/{{Jellystone}}'': Auggie Doggie is eleven years old, yet she's totally okay riding around in a stroller and her EstablishingCharacterMoment has her [[HollywoodToneDeaf scream-singing a song about kittens]] to cheer up a lady in the hospital. Possibly [[JustifiedTrope justified]] due to Doggie Daddy's comedic overprotectiveness, but still. Parodied in "Mr. Flabby Dabby Wabby Jabby" when Shazzan says that the kids are too young and innocent to watch a horror film, and should instead watch a movie that appears to be about ''actual babies.''
223	* ''WesternAnimation/JimmyTwoShoes'': The titular character is a teenager, yet he's very excitable, gullible, and childish and seeks for fun wherever he goes.
224	* ''WesternAnimation/{{Kaeloo}}'': Kaeloo is a preteen, but she enjoys childish things like fairy tales, tea parties, and jumping rope, which are deemed childish even by the characters in the show who are younger than her.
225	* ''WesternAnimation/KimPossible'': Ron Stoppable tends to dip into this territory. A prime example is in the episode "Coach Possible" where, unlike most high schoolers, he doesn't mind hanging out at the local SuckECheeses and is horrified when the villains steal, then redress his favorite animatronic. ''"PIZZAPOTAMUS!!! [[BigNo NOOO!!!"]]''
226	* ''WesternAnimation/KingOfTheHill'': Bobby Hill in later episodes. Even though he is supposed to be 14 years old, he occasionally acts very childish. This is mainly a case of DependingOnTheWriter; in some episodes he is fairly intelligent and mature and in others he is incredibly whiny, foolish, and immature. The 13th season has some of the worst offenders, with episodes like "Master of Puppets" and "Reborn on the Fourth of July".
227	* ''WesternAnimation/TheLoudHouse'':
228	** Downplayed with 11/12-year-old [[Characters/TheLoudHouseLincolnLoud Lincoln Loud]], who mostly acts his age, but owns a stuffed rabbit named Bun-Bun, which he cares for with an affection most kids his age would have outgrown.
229	** Leni, the second of Lincoln's older sisters, is 16/17, but due to being TheDitz and having a [[AttentionDeficitOohShiny short attention span]], she's often entertained by things commonly used for small children (like finger painting in "Schooled!" and a kiddie puzzle in "Lock and Loud"). In "Changing the Baby", she cries like a baby and even says, "Agoo".
230	** Luan is 14/15 years old, yet has a fondness for puns, pranks, clowns, novelty toys, and childlike comedy in general.
231	** 13/14-year-old Lynn is not above throwing tantrums when she doesn't get what she wants, and exhibits very poor sportsmanship for a PassionateSportsGirl. Her childishness is particularly exhibited in "Cereal Offender" (where she rides on a shopping cart and wrecks many aisles at a supermarket), and in "Sitting Bull" (where she plays on a tire swing in the backyard with her younger twin siblings, 6/7-year-olds Lola and Lana, which her four older sisters deem her immature for).
232	** CJ Casagrande is another 13-year-old who likes playing pirates with his family and Lincoln. In this case, CJ's behavior is justified because he has Down Syndrome.
233	** Lincoln's best friend Clyde [=McBride=] also has a shade of this, since he's a fan of ''Blarney the Dinosaur'' (an {{Expy}} of ''Series/BarneyAndFriends''), which is aimed at a much younger age demographic than him.
234	* ''WesternAnimation/MakingFiends'': Charlotte is a 4th-grader with the mindset of a pre-schooler, showing a considerably egregious imagination, enjoying toys and games most children of her age would have outgrown from, singing childish songs, and being overly optimistic about pretty much everything.
235	* ''WesternAnimation/MaxAndRuby'': Max starts out at 3 and speaks in one-word sentences. As a 4-year-old, he speaks in complete sentences but not in fluent English. He is the only kid in his class unable to do so.
236	* ''WesternAnimation/MiraculousLadybug'': [[Characters/MiraculousLadybugChloeBourgeois Chloé Bourgeois]] is 14/15 and very much behaves like she was 6, still carrying around a teddy bear and believing in things such as Santa Claus and cooties as well as having the temper of a literal spoiled child. Most of this stems from her MissingMom and her father constantly enabling her behavior. Neither parent, however, is willing to own up to this.
237	* ''WesternAnimation/MoralOrel'':
238	** Shapey, Orel's younger [[spoiler:half-]]brother, is seven years old, but behaves like a toddler. Unlike most examples, it isn't treated as normal, as it's clear that Shapey's issues are the result of his dysfunctional household. [[spoiler:In the DistantFinale, it's implied that he was able to outgrow it and become a functional adult.]]
239	** Orel's father, Clay, was shown to also not act his age, acting like a 5 or 6 year old when really he was 12. This was because his mother spoiled him rotten, and all the attention she gave him made him constantly act like her precious little baby, which greatly annoyed his father.
240	* ''WesternAnimation/TheOwlHouse'': [[Characters/TheOwlHouseLuzNoceda Luz Noceda]] is a young teen of high school age with the wonderment and rowdiness of a child at least in their elementary years. She plays with dolls and action figures at her current age too. {{Justified\|Trope}}, as her fixation on fantasies is attributed to years of social isolation, societal pressure, and [[spoiler:grief following her father's death at a young age]].
241	* ''WesternAnimation/{{Recess}}'': A CompressedVice in the episode "Bonky Fever," where Mikey becomes obsessed with Bonky the Dragon (a parody to Barney), and starts to act more and more childish as time goes on. This includes crying like a baby after getting gently tapped with a dodge ball, throwing a temper tantrum in the cafeteria after the lunch lady refused to give him an extra pudding for his Bonky doll, and asking T.J. to walk him to the bathroom so he can "go potty." This is because he's turning ten, and he's starting to realize that GrowingUpSucks.
242	** In "Yes, Mikey, Santa Does Shave" he's the only one of his friends who still believes in Santa.
243	* ''WesternAnimation/RosiesRules'': Played for laughs. Crystal boasts about how she's 12 and very grown up, only to squeal seconds later when she sees balloon animals.
244	* ''WesternAnimation/Rugrats1991'': Downplayed for Chuckie. He's two, and while he mainly behaves like a two-year-old, the only word he can say [[BabyLanguage to the grownups]] is "No".
245	* ''WesternAnimation/TheSimpsons'':
246	** Ralph Wiggum is this combined with {{Cloudcuckoolander}} and ambiguous disorder, he often acts more like a four or five-year-old rather than an eight-year-old.
247	** [[Characters/TheSimpsonsBartSimpson Bart Simpson]] in several later season episodes is often seen acting far younger than a ten year old, most likely as a result of having his BrattyHalfPint characterization {{Flanderiz\|ation}}ed. This is emphasized by Marge and Lisa buying him easy reader books and videos meant for very young children.
248	** Milhouse had never seen chapter one of ''WesternAnimation/FindingNemo'' until he came across it by accident. When asked to [[Recap/TheSimpsonsS11E9GriftOfTheMagi bring a toy to school]], he chooses one that's for three-and-under.
249	** Rodd and Todd Flanders are being raised by a hyper-conservative Christian fundamentalist father.
250	* ''WesternAnimation/SonicTheHedgehogSatAM'': This version of Tails is intended to be ten years old, which would make him older than his game counterpart, who is stated to be eight. However, he acts as if he were junior to [[VideoGame/SonicTheHedgehog1 his game counterpart]]; Tails is not allowed to be a Freedom Fighter for his own safety, which closely matches the way adults would realistically treat a ten-year-old, but it still doesn't explain his immature personality. He also calls Sally "Aunt Sally" despite there only being a slight age gap between them.
251	* ''WesternAnimation/SouthPark'': [[Characters/SouthParkEricCartman Eric Cartman]] is a terrifying and hilarious example, often appearing juvenile and violent. He is obsessed with sweets, claims psychic powers, and enjoys playing with stuffed animals and dolls. His mother Liane's [[PushoverParents carefree parenting]] prevents him from growing up.
252	* ''WesternAnimation/SpongeBobSquarePants'': Pearl may be a teenager, but she dreams about having tea parties, and on occasion, she makes drawings of sea-unicorns. This was mostly in the [[CharacterizationMarchesOn earlier seasons]]; later seasons have her acting more like a stereotypical teenage girl.
253	* ''WesternAnimation/StevenUniverse'': [[Characters/StevenUniverseStevenQuartzUniverse The titular character]] has a VagueAge for the first season and a half, but "Steven's Birthday" reveals him to be turning fourteen. His MuggleBestFriend and LoveInterest, who is not even thirteen but is more mature, is shocked. Aside from the fact that he still sleeps with a teddy bear and generally acts like he's under eleven, Steven also [[OlderThanHeLooks looks quite younger]]: because [[HalfHumanHybrid his mother]] was [[TheAgeless an ageless alien]] whose species have their physical forms match their mental ages, this ended up applying to Steven as well, with his dad showing Connie a scrapbook showing that Steven hasn't physically aged since he was eight. ''[[WesternAnimation/StevenUniverseFuture Future]]'' would finally have a more mature (but emotionally unstable) Steven who finally looks his age (at that point, 16).
254	* ''Franchise/TeenageMutantNinjaTurtles'':
255	** In ''WesternAnimation/TeenageMutantNinjaTurtles1987'', they’re more like ''Tweenage'' Mutant Ninja Turtles at times. [[DependingOnTheWriter It actually kind of depends on the writer]]; some episodes they act age-appropriate or like grown men.
256	** Mikey in ''WesternAnimation/TeenageMutantNinjaTurtles2012'' is this, especially compared to his brothers. "Journey to the Center of Mikey's Mind" shows that Mikey is a little kid in his mind and still has yet to mature, despite being a teenager, which is why he can charm Leatherhead and why he never thinks ahead and refuses to take blame (see "Mikey Gets Shellacne").
257	* ''WesternAnimation/TinyToonAdventures'': The main characters are treated as teenagers, and in their less wacky moments usually act like them (though it fluctuates). But never Dizzy Devil, Lil Sneezer, or Elmyra, who, despite being in the same class as the other characters, consistently act far younger than they ought to (which [[KavorkaMan doesn't stop Dizzy from having multiple attractive human girlfriends]].)
258	* ''WesternAnimation/TheVentureBros'': Hank and Dean Venture are around sixteen when the series begins, and yet their behaviors and speech patterns are on par with those of elementary schoolers in a 50s sitcom. This is mainly played for laughs in earlier seasons, mocking squeaky-clean supposed teenagers in older media, but it becomes increasingly justified later, as it's revealed just how horribly sheltered their upbringing is and that they've lost a fair bit of life experience as a result of being clones. By the fourth season, they end up forced to mature somewhat, though they're still a few years behind their peer groups.
259	[[/folder]]

Context Main / KiddieKid