Baby Morph Episode

Must have been a slow year.

"It's Maud! She's a baby!"

— Mildred Hubble, The Worst Witch, "Miss Cackle's Birthday"

Sometimes an episode will come along where, through some means, one or more than one of the characters is transformed into an infant, requiring their friends to find a way to turn them back.

This is generally done by either magical or technological means (such as taking a potion or being hit by a ray). Sometimes, a villain or trickster character turns them into a baby on purpose, but other times, a hero or a background character is using the magic or technology to attempt something different and accidentally turns the character into a baby.

Sometimes, the character still has some or all of their adult mind, making them a Brainy Baby, but other times, they have been completely transformed, meaning that they cannot do things they normally would be able to do, which means that the other character might have to find a way to turn them back quickly because something is coming up that requires the transformed character's skills. Also, now that the character's a baby, they're dependent, which means that they will have to be, for lack of a better word, babysat until the change can be reversed. This "babysitting" might lead to Cringe Comedy, e.g. "I don't want to be changing my friend/boyfriend/girlfriend/spouse/parent/etc's diapers!"

Depending on the transformation, sometimes the baby's clothes will change to fit them but other times, Shapeshifting Excludes Clothing so the other characters must find some clothes to dress the baby in (sometimes an Improvised Diaper).

Subtrope of Fountain of Youth. Often overlaps with Parents for a Day. If this is done to a villain, it can be an attempt at Raise Him Right This Time (especially if it becomes permanent).

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Examples

Anime & Manga

• The 100 Girlfriends Who Really, Really, Really, Really, Really Love You: Chapter 28 features the girls (except Hakari) turned into babies thanks to one of Kusuri's drugs (again). Chapter 84 does it again, with Hakari herself and the girlfriends who had been introduced since as the victims instead, and plenty of Lampshade Hanging from the others. Chapter 167 does it again with the next batch of girlfriends, and even more Lampshade Hanging about how this is becoming a tradition.
• Happens in Good Luck Girl! to Ichiko when Momiji tricks her into inhaling a gas that turns her into an old lady, but the boxes were mixed up and she became a child instead.
• Part 3 of JoJo's Bizarre Adventure has an enemy Stand user named Alessi who has ability. He transforms Polnareff into a toddler, and Polnareff must endure a deadly game of cat-and-mouse before his adult mind finishes catching up with his child body. The woman who cares for Polnareff during this time is also turned all the way back into a fetus. However, Alessi then makes the mistake of turning Jotaro into a little kid, only to learn that Jotaro was just as badass as a child.
• In chapter 41 of the Miss Kobayashi's Dragon Maid Spin-Off Elma's Office Lady Life, Elma turns into a baby after eating a weird mushroom off the ground. The other girls have a rough time looking after her.
• In Natsume's Book of Friends, Natsume is turned into a young child by a youkai as repayment for his help, since it only sees it as a way to extend his short human life and cannot see why it would be a problem. Natsume's friends Taki and Tanuma watch over him while Madara tracks down the youkai responsible to make it reverse its "gift".
• In a chapter of the Japan-only Neptunia manga Megami Tsuushin, Neptune has to watch over Nepgear, Uni, Rom and Ram after they were accidentally turned into babies.
• Pokémon Journeys: The Series has Ash, Goh and Dawn alongside their Alternate Universe counterparts get turned into toddlers thanks to a fight between Dialga and Palkia warping space and time. This also devolves their Pokémon all the way back into eggs. Everyone is ultimately restored when Arceus (or an afterimage of the Pokémon) is summoned to break up the fight.
• The Pretty Cure franchise has multiple examples of this trope, most notably in All-Star Memories, the fifteenth anniversary movie.
• In one episode of Sgt. Frog, Kululu was accidentally turned into a baby by one of his inventions, and Keroro has to find a way to repair it to turn him back while Natsumi and Fuyuki have to babysit him.
• The Stitch! anime has two episodes involving Experiment 151, also known as Babyfier (who first debuted in Lilo & Stitch: The Series; see the Western Animation folder below):
  • The second season episode "Link-age" has Babyfier (along with several other experiments) sent by Dr. Hämsterviel to Izayoi Elementary School to try to get Stitch's good deed counter. Babyfier ends up transforming nearly everyone in Yuna's class, Yuna's Gramma, Pleakley, and Jumba into babies, and Stitch is forced to babysit everyone while Yuna and Penny find the ingredients for the antidote.
  • The third season episode "Toddler-fier" has Hämsterviel modifying 151 to turn people into toddlers instead, rechristening the experiment as "Toddler-fier". The experiment transforms Yuna, Hiroman, Dolores, Jessica, Toriko, and Makiko into toddlers, causing much trouble for Stitch and Yuna's older cousin Tigerlily, the latter who had a date with a man in the episode.

Asian Animation

• In Season 3 episode 48 of Happy Heroes, Little M. accidentally turns Big M. into a baby using one of Doctor H.'s inventions. Careless S. takes in the babyfied Big M. and cares for him for most of the episode.
• The Lamput episode "Memory Loss" is a mental variation. An accidental injury causes Fat Doc to think he's a baby, so Slim Doc and Lamput take it upon themselves to be his caretakers.
• The first episode of the Mole's World cartoon's second season, "Good Boy, Bad Boy", begins with the villain Kula accidentally being turned into a baby when his pet lahm Shaiza drops a potion. The babified mage finds his way to Molele and Uncle Bodhi's house and makes the former mad when he keeps messing around with his toys.
• In episode 13 of Nana Moon, Keke discovers a scroll containing a magic spell that causes whoever it hits to de-age. The spell makes the king of Moon Haven and Grumble turn into babies.
• Pleasant Goat and Big Big Wolf:
  • In episode 10 of Smart Dodging, Slowy eats his candy invention which turns him into a baby for the most of the episode and the goats have to babysit him. Weslie and Slowy get captured by Wolffy and he invented a potion which can turn Slowy back to normal, and Weslie instead uses Slowy's candy to turn Wolffy into baby and Wilie's "brother", while Slowy can clone himself.
  • Again in episode 37 of Flying Island: The Sky Adventure, Slowy eats a fruit that turns him into a baby and he is taken in by the Elder Stars. The goats have to figure out a way to turn him back to normal for the next several episodes.

Comic Books

• In issue #52 of the Animaniacs comic, Pinky and the Brain turn into young children after the former accidentally spills the latter's new age-reversal potion all over them.
• Batman is turned into a baby in one issue of the Batman comic, entitled "Batman Becomes Bat-Baby!" Though he still kept his adult strength, agility and intelligence. So really all the villains did was make him a harder target.
• In the SpongeBob SquarePants comic "Spongebob Babysitterpants", Spongebob accidentally turns Mermaid Man into a baby when he plugs in one of Man Ray's old machines. At the end of the story, Barnacle Boy, the Swashbuckling Sidekicks and Man Ray are also turned into babies.
• Superman's Girl Friend, Lois Lane
  • In Issue #10,◊ Lois is changed into a baby. And she's still a baby at the end of the story!◊
  • In Issue #33,◊ Lois turns the tables on Superman when he becomes a baby.
  • And it happened to Superman yet again in Issue #57.◊
• The Fifth Week Event Young Justice: Sins of Youth involved the adult heroes (most notably the Justice League of America) being turned into children by Klarion the Witch Boy, while at the same time the teen heroes were transformed into adults and had to keep an eye on their suddenly immature mentors. Klarion also assembled a team of kiddified villains, including "Black Adam Jr", "Private Cold", "Kid Amazo" and "Minima".
• An unrelated Young Justice storyline saw Empress's parents turned into babies by the villain Baron Agua Sin Gaaz, who also happened to be her grandfather. (Well, strictly, they were killed but their souls were reborn in baby clones of themselves.) This was not reversed, and she was still caring for them when the book ended.

Fan Works

• In Accidental War Criminal Acquisition, malfunctioning machinery reverts Starscream's frame into a sparkling's.
• In Baby Boom, a fanfiction of The Loud House, Leni accidentally triggers a machine Lisa built, turning herself and all her sisters (sans Lily who's already a baby and Lisa who was out) into babies. The fanfiction has two possible endings. In the first one, the effects of the machine wear off and they turn back to normal but four of their pets (Charles, Cliff, Geo, and Walt) have turned into baby pets, and in the second ending, they stay as babies and have to grow up again.
• In the Invader Zim fic Baby Gazzee, Dib discovers a spell that causes people's physical age to match their emotional age. When it's accidentally cast on Gaz (who often resorts to violence and tantrums when she doesn't get her way), she's turned into a baby; while her mind is intact, everyone else's memories are altered to believe she's always been one and treat her as such. This lasts most of a week until Dib finds Gaz's unaltered birth certificate, which restores his memories enough for him to undo the spell.
• In Baby Miss Hardbroom, Miss Hardbroom from The Worst Witch turns into a baby.
• In the My Little Pony: Friendship Is Magic fanfiction A Baby Zebra's Apple Turnover, Apple Bloom accidentally turns Zecora the zebra into a baby.
• In The Decepticons Revenge, the Decepticons use a special gun to turn Elita One, Chromia, Ironhide, Ratchet and Skyfire into sparklings. Starscream later uses the gun on himself.
• Dimensional Links: This trope happens to all 17 Links when they come in the Ocarina of Time world. Because they end up in the future, Ganondorf tricks everybody into time travelling in the past, de-aging everyone by seven years. This results in everyone (except Shadow but he's a shapeshifter) becoming too young to fight, and about half of them become toddlers or even babies.
• In the Agents of S.H.I.E.L.D. fanfic The Little Guy, Leo Fitz is inexplicably turned into a baby and Coulson’s team has to take care of him while Jemma figures out a cure.
• Kedabory's Muppet Mania: In Crestfeather's episode, Bunsen's time machine mistakenly turns Beaker into a baby. Bunsen is tasked with watching him until the time machine recharges.
• In the My Little Pony: Friendship Is Magic fanfiction Pound and Pumpkin Cake's Adventures (and Misadventures) in Potty Training, the chapters "Diamond the Dazzling Foal" and "Diamond's Dazzling Diaper Day" involve Diamond Tiara turning into a baby while babysitting the Cake twins due to Pumpkin Cake's unstable magic.
• In Sunset Shimmer Hunts the Undead, Sunset Shimmer drinks a potion given to her by Zecora as a Christmas present, which turns her into a baby the next morning. It is ultimately a well-meaning trick, as it gave her adoptive mother Celestia a chance to be the mother she always wanted to be but had been denied to her because of her duties in protecting Canterlot from all manners of monsters for the past twenty years. The potion is designed to simulate all of human development from infant to fully-grown adult in the span of a week so as not to wear out the enchantment of the long-held dream for Celestia. During that time Sunset retains her memories, so for this trope in particular Sunset becomes a Brainy Baby the first morning, unable to speak but realizing that Aunt Luna slipped some sugar into her baby bottle behind Celestia's back.
• In this piece of Sleepless Domain fanart, main characters Kokoro and Undine are magically turned into babies, leaving poor Zoe to take care of them until they return to normal.
• In Second Sunrise, a malfunctioning weapon turns several of the Autobot frontliners into sparklings.
• Ultra Fast Pony: In the episode "Makin' Babies", Twilight teaches Sweetie Belle where babies come from (magic, of course). Sweetie Belle tries to cast the spell herself, and instead turns the main adult cast into babies.
• In this piece of Inanimate Insanity fanart, all of the members of The Bright Lights (except for Test tube) have turned into babies due to one of Test tube's inventions. And now Test tube has to babysit her infant teammates while looking for a cure to change them back at the same time.

Film — Live-Action

• Star Trek: Insurrection: The effect that the atmosphere of a planet has on people is that it rejuvenates them into teen-age/early 20s having this effect on the Enterprise crew (except Data of course) making them not only more rebellious against authority but also with some comedic effect specially regarding Worf.
• Twilight Zone: The Movie remakes one of the original show's episode into one of the segments with the residents of a nursing home turning into children.

Literature

• In Charlie and the Great Glass Elevator Grandpa George and Grandmas Josephine & Georgina take overdoses of Wonka-Vite, which de-ages George & Josephine to babies and Georgina becomes minus two years old.
• The unfocused time magic surrounding the creation of The Last Continent results in the Dean becoming a sulky thirteen year old and the Librarian becoming a baby orang-utan. The effects are temporary, in the Dean's case being reversed when he remembers what puberty was actually like, and his body decides it's not going through that again.
• In the Paul Jennings story Pink Bow-Ties, an age machine that can make people turn younger or older is used by a mean-faced man to turn himself into a baby. He then accidentally makes himself older and dies.

Live-Action TV

• In the "Fountain of Youth" episode of The Mighty Boosh, Howard and Vince are reduced to babies after drinking water from the eponymous fountain.
• Star Trek: The Next Generation: episode "Rascals" has a transporter accident turning Captain Picard, Guinan, Keiko O'Brien and Ensign Ro turn into prepubescent kids.
• Star Trek: Voyager: Downplayed in "The Thaw". The mysterious clown entity turns Harry Kim into a baby (his worst fear) but only for a moment.
• The Twilight Zone (1959) episode "Kick the Can" has the residents of a retirement home de-aging to their childhood thanks to magic. This episode was remade in Twilight Zone: The Movie (directed by Steven Spielberg). Even the cat of one of the residents becomes a kitty.
• The Worst Witch: In "Miss Cackle's Birthday", Maud is unhappy and her friends try to make a potion to cheer her up but it turns her into a baby instead.

Video Games

• Done a few times for gags in the Crash Bandicoot series:
  • The ending to Crash Bandicoot 3: Warped has Cortex and Tropy morphed into infants as a result of the malfunctioning Time Twister, with Uka Uka at the brunt of their bickering.
  • Both the standard and 100% ending of the DS version Crash of the Titans have different characters devolved into babies by Nina's ray gun. The standard ending of the game has her laser deflect and change her. The 100% ending is strangely the "bad ending" with her double crossing Crash and Cortex, zapping Crash into a baby and usurping Cortex' plan successfully.
  • Crash Team Racing Nitro-Fueled has baby versions of Crash and Coco unlockable coinciding with the Back N. Time Grand Prix. Baby Cortex and Tropy join them after the Gasmoxia Grand Prix.
• In Dragalia Lost's Elementary Escapades event, Ranzal and Louise become schoolchildren thanks to a controlled failure of one of Sinoa's experiments. Alongside the Waterwyrm Mercury, who has taken a humanoid form, they are tasked with investigating a school Emile has set up in the Dyrenell Empire. However, they must do so before the effect of the experiment wears off. Shenanigans ensue.
• In Granblue Fantasy, Anne's second Fate Episode has her accidentally transformed into a toddler when she tries to protect Grea from some unknown magic mist. Owen, Grea, and the Captain then have to figure out how to restore her while taking care of the now young Anne.
• In The Simpsons video game The Simpsons: Virtual Bart, the titular character has to complete a series of virtual simulations, one of which is where he is turned into a baby.
• In SINoALICE, the Sanctuary of Nursery Rhymes event deages Alice, Little Mermaid, Dorothy and Aladdin to babies with Parrah and Noya tasking Cinderella into taking care of the four of them until they turn back into their normal selves. Cinderella ends up getting attached to the 'children' after 5 years of being a Struggling Single Mother and as a result, Parrah and Noya declare the world they gave her to raise the kids in a 'failure'.

Web Animation

• In the A Day With Bowser Jr episode Rise of Fawful, Fawful hits Bowser with a laser beam that turns him into an infant.
• Koit: The reason why this is in the Web Animation section, not Music, is because it doesn't feature in the lyrics but does feature in the animation for one of the songs, namely the song "Magical Piss" about a man whose pee has magical properties, shows him peeing on an old woman and turning her into a baby.
• In Manga Soprano, most stories featuring Shotae are expected to be this.
  • What If The People You Love Suddenly Turned Into an Infant and Became More Adorable? (sic): Shotae shows up out of nowhere and sprays infantilization medicine on Alto, turning him into a toddler. Thankfully, Kanade dispatched her and took Alto to her place to take care of him for the time being.
  • I met a magician.And the age of a boy in my class dropped.... (sic): Shotae struck again, turning Kairi into a baby by waving her magic wand and spraying infantilization medicine on him.
• The My Little Pony: Tell Your Tale episode "Making a Foal of Me" revolves around Sunny, Izzy and Hitch being transformed into foals, with the pegasus sisters Pipp and Zipp having to look after them. Another episode called "Nightmare Market" involves all of the main characters transformed into foals at the eponymous location, and Alphabittle is the one to look after them.

Web Original

• Protectors of the Plot Continuum: At one point, the Continuity Council of Gallifrey-in-Exile (plus one) get de-aged into various stages of childhood. Chaos ensues.

Web Video

• Oxventure: The episode "Watch Out!" has Prudence magically transformed into a baby about halfway through by a magic watch.

Western Animation

• The Adventures of Jimmy Neutron, Boy Genius: Jimmy Neutron accidentally transformed his own grandmother into a baby in "Granny Baby".
• In the Adventures of Sonic the Hedgehog episode, "Musta Been a Beautiful Baby", Robotnik invents the Decrepitizer to age Sonic into a senior so he won't be fast. Scratch and Grounder accidentally put the Decrepitizer in reverse, de-aging Sonic, Tails, and eventually Robotnik into babies. At the end of the episode, Robotnik is aged into a senior.
• An unusual villain's example in Adventures of the Gummi Bears has the Ogres de-aging due to a freaky kitchen accident when Gummiberry juice get mixed with baby formula. Grammi finds one of the Ogres and tries to Raise Him Right This Time but the effect is only temporary as contact with water breaks the spell. She succeeded to some degree as the Ogre remembers her care and defends her when Igthorn threatens to hit her.
• Atomic Puppet presents an interesting variant in "Lil' AP", in which AP and everyone else in Mega City except Joey gets their minds reduced to a toddler-like state by a supervillain to make them all easier to enslave and give Joey the problem of having to take care of an infantile AP.
• In the Batman: The Brave and the Bold episode "The Menace of Mr. Mind!", Batman gets hit by Dr. Sivana's age-reversing ray, probably as an homage to the Bat-Baby comic mentioned above. (The spin-off comic also had a Bat-Baby story, in which he's hit with a spell by Felix Faust, and must team up with Sugar and Spike to reverse the effects.)
• Ben 10 features a literal Fountain of Youth (though it's more of a natural pool or spring). Max turns into a 10-year-old and is revealed to be similar to Ben at that age. Ben and the Omnitrix aliens turn into toddlers and need to be cared for as such.
• The Bump in the Night episode "Baby Jail" has Mr. Bumpy turned into a baby while trying to give a bottle of baby formula to a crib full of babies and the largest of the infants, Big Mike, squirts some of the formula into his mouth. Bumpy spends the rest of the episode attempting to help the babies escape and is ultimately returned to normal after Molly Coddle burps him.
• Camp Lazlo had an episode where Raj begins relying on mail order high-tech gadgets to the point that his limbs atrophy from lack of use and he later turns into a baby. Lazlo and Clam leave him in Scoutmaster Lumpus' care until he begins to steadily return to his proper age, then the episode ends with Slinkman taking care of Lumpus after he becomes a baby in the same manner.
• Courage the Cowardly Dog: In "Little Muriel", Muriel gets turned into a rambunctious 3 1/2-year old toddler thanks to a freak incident with a tornado. After getting run ragged trying to care for Muriel, Courage manages to get her back to her normal age by dropping her into a tornado in the Southern hemisphere (where, thanks to the Coriolis effect, tornadoes spin in the opposite direction).
• Dexter's Laboratory. The episode "Don't Be a Baby" has Dexter accidentally turn his parents into babies after creating a machine that was supposed to age up Dexter and Dee Dee so they could go see a movie.
• Doc McStuffins: In "Lambie and the McStuffins Babies", Lambie, Stuffy, Hallie and Chilly got transformed into baby toys. They did it again in "Adventures in Babyland" along with Doc while still searching for CeCe.
• Dogs in Space: In "Settle Down", the Pluto's crew (except Stella, but including Kira) are transformed into puppies thanks to a shady salesman giving them a potion.
• An episode of Donkey Kong Country had Donkey Kong become Baby Kong after drinking one of Cranky's potions. At the end of the episode, King K. Rool drinks the potion and turns into a baby.
• In the Ed, Edd n Eddy episode "Every Which Way But Ed", the Eds de-age themselves by literally running through flashbacks and are reverted to babies. Edd tries to get them home, but Eddy has Ed literally drop a house on him just so they can scam a quarter out of Edd.
• The Fairly OddParents!:
  • In the episode "Baby Face", when Timmy hides from Francis in a room full of infants, he wishes to be turned into a baby to avoid detection. Although he retains his intelligence, he can no longer talk, meaning he can only wish to return to normal by spelling it out.
  • "Poof's Playdate" has Timmy come up with a plan to supply Cosmo and Wanda's son Poof with other fairy babies to play with by inviting Jorgen Von Strangle, the Tooth Fairy, Juandissimo and Cupid to a pancake party and having them turned into babies. Cosmo and Wanda end up turning themselves into infants as well to join a wagon ride with the rest of the fairy babies, leaving Timmy with the task of having to distract his parents from discovering the fairy babies and finding a way to restore his godparents to their normal ages so he can undo his wish and restore every fairy baby besides Poof to adulthood as well.
• The Fanboy and Chum Chum episode "Crib Notes" has Kyle turn into a baby as a side effect of a spell he cast with the intent of gaining crib notes he could use to cheat on a test he can take to be allowed back into Milkweed Academy.
• The Fresh Beat Band of Spies final episode "Fresh Beat Babies" had Squee Z. Dumpkins returning with her Fuzzibunkins, who start turning Commissioner Goldstar, the Fresh Beats, and the whole town into super cute babies.
• The Futurama episode "Teenage Mutant Leela's Hurdles" features the Planet Express crew growing younger after falling into a pit of "rejuvenating" tar. The Professor tries to fix this problem but ends up getting worse, making them rapidly de-age. The Professor and Leela (who refused the treatment) are only ones not to de-age all the way down to a baby. Though Zoidberg actually goes through different evolutionary stages, ending with him turned into sentient coral with siblings ready to Bud from him.
• In the Hotel Transylvania: The Series episode "Holy Babies", Mavis and Pedro are turned into babies.
• In the Jackie Chan Adventures episode "The J-Tots", Jade uses a spell that accidentally turns Jackie, Uncle, Tohru, El Toro and Viper into toddlers. She also does this to the Chang gang during their fight in order to even the odds. While the J-Team are turned back into adults, the Chang gang aren't (at least on-camera. Since they never appear again, it's unknown if they were changed back.)
• The Johnny Bravo episode "Look Who's Drooling" has Johnny become a baby after accidentally drinking a potion Carl made.
• Johnny Test had an episode where Bling-Bling Boy turned himself into a baby to get closer to Susan. He also turned Johnny and Dukey into a toddler and puppy. A later episode also had Susan and Mary turn themselves into babies so Gil Nexdoor would take care of them.
• In the Justice League Unlimited episode "Kid Stuff", Morgaine le Fey transforms Superman, Batman, Wonder Woman, and Green Lantern into 8-year-olds after Mordred uses his magic to remove all adults from Earth and keep children on the Earth.
• In the Kim Possible half-episode "Nursery Crimes", Ron is repeatedly transformed into a baby and back to normal.
• Krypto the Superdog has this episode "Puppy Problems" where Mechanikat and Snooky transformed everyone in the Dog Star Patrol-including Krypto himself-into puppies. In the end, Krypto transformed Mechanikat into a kitten.
• Lilo & Stitch: The Series has the episode "Babyfier". It features the titular Experiment 151 doing this, transforming all of Lilo's family and Gantu into babies. Once that was reversed, she sends the experiment to the animal shelter where she first adopted Stitch so the experiment could make older dogs young again and more likely to be adopted.
• The Magic Key: In “The Fountain Of Youth”, Wilf drinks from the eponymous fountain and ends up reverting to a baby, with Floppy the dog also turning into a puppy. Neither of them spends too much time in this state before being restored by the Fountain Of Age, however.
• One episode of Men in Black: The Series has Jay and Kay escorting a girl from a race that ages rapidly in Earth's atmosphere, thus requiring her to use a device to rejuvenate herself. When the girl is kidnapped, the rejuvenating device is broken, causing its liquid components to splash all over Kay, who grows progressively younger as a result.
• The Mickey Mouse Clubhouse episode "Goofy Baby" involves Professor Ludwig von Drake's invention turning Goofy into a baby and the rest of the cast looking after him. The Sequel Episode "Goofy Babysitter" reversed the roles — now it's Goofy trying to look after his transformed friends.
• In Milo Murphy's Law, "Backwards to School Night" sees this happen to the parents of the show's trio.
• In the Mini Beat Power Rockers episode "Baby Dolores". Dolores accidently makes a wish via a new phone app which transforms her into a baby. She at first hates it but grows to love it causing mayhem in the daycare while the babies try to clean up her mess and turn her back before their parents come to pick them up.
• The Monster Farm episode "Pablum Problem" had a mishap with Dr. Woolly's growth ray result in Dr. Woolly, Count Cluckula, Frankenswine, Goatasarus Rex, Zombeef and Cowapatra being turned into babies, with Jack having to look after the infants until he could fix Dr. Woolly's invention and turn the monster animals back into adults.
• An episode of Monsters vs. Aliens (2013) has the President become a baby after being hit with Dr. Cockroach's Youth Ray.
• The Oggy and the Cockroaches episode "Back to the Past! (Featuring Olivia)" has a witch putting a curse on Oggy, Bob and Jack for tearing up her hat,^note They didn't do that though. It was the cockroaches, who put the blame on them, turning them into children. At the end, though, they do turn back into normal while the cockroaches are turned into children.
• The Phineas and Ferb episode "Agent Doof" has Phineas and Ferb accidentally getting turned into babies by Doof's inator. However, they're still as inventive as ever, at one point dismantling a motorcycle.
• In an episode of Rainbow Butterfly Unicorn Kitty called "Fountain of Too Much Youth". Miguel learns his favorite malt is on the kids menu. So him and Felicity go on a quest to find the fountain of youth. When he finds it, he takes a huge gulp turning into a toddler. But since he was supposed to swim not drink. He starts getting younger and younger. So Felicity has to babysit her friend who is becoming more and more a little baby on a journey to the Wheel of aged cheese. After back and forth between baby and teen/adult. Miguel is restored but Felicity is a baby. At the end she is back to normal but all 4 of the main characters get wet and episode ends with them as babies.
• Tom and Ben are turned into babies in the Talking Tom Heroes episode "Baby Potion". At the end, when they turn back to normal, the 2 are wearing diapers and are understandably embarrassed.
• Egon is slowly transformed into a baby in The Real Ghostbusters episode "Three Men and an Egon".
• The Scooby-Doo and Scrappy-Doo Show episode "Scooby-Dooby Goo" had Scooby and Shaggy temporarily turned into babies after Scrappy forgets to take them out of a steam machine at the gym.
• The Smurfs (1981):
  • "Gargamel's Second Childhood" has the eponymous wizard de-aged to a child and his apprentice Scruples turned into an adult due to a spell gone wrong. This, nevertheless, is used by Gargamel on his advantage to win the trust of the Smurfling who does not recognize him. Of course, as Failure Is the Only Option for him, at the end of the episode, a further miscalculation turns him into an elderly man and Scruples into an infant.
  • Another episode takes from the comics, having Gargamel turn himself into a Baby Smurfling to infiltrate the Smurf Village.
• Sofia the First: In the episode "Two Princesses and a Baby", Amber initially wants to have her birthday all to herself instead of sharing it with her twin brother, James, so she goes to Cedric and asks him to turn James two months younger than her for the day. However, due to a magical mishap, James is turned into a toddler and Amber and Sofia are forced to watch him until Cedric can turn him back to normal, before their parents return to the castle with their birthday gifts for the twins.
• One episode of SpongeBob SquarePants featured Plankton turning everyone into babies to steal the Krabby Patty formula.
• Steven Universe: In "Steven's Birthday", Steven tries to fake a growth-spurt on his fourteenth birthday after realizing that he hasn't physically aged since he was around eight years old. Unfortunately, the strain of making himself taller with his Gem shape-shifting abilities causes him to temporarily revert to infancy. Connie comforts Steven by assuring him she'll be his friend no matter how long it takes to get him back to normal, and by the next day Steven is back to his old self. And as a bonus, he's grown his first facial hair!
• Super Mario Bros. cartoons:
  • The Super Mario Bros. Super Show!: Princess Toadstool became a baby in "Two Plumbers and a Baby" after falling into the Fountain of Youth. The same thing happened to King Koopa (under the alias of King Goo Goo Ga Ga Koopa) near the end of the episode.
  • The Adventures of Super Mario Bros. 3: In "Toddler Terrors of Time Travel", Kooky Von Koopa's Time Travel Tube turns him, King Koopa, Mario, Luigi, and Toad into babies.
• The Tak and the Power of Juju (2007) episode "Little Chief" has the Chief of the Pupununu long to relive his youth, so he asks Tak to use his magic to make him a teenager again. Tak instead turns the Chief into a baby by mistake, which becomes a problem when the rest of the Pupununu tribe start panicking over the absence of their Chief and the Chief has grown too accustomed to the Pupununu people taking care of him to fulfill his obligations as the Pupununu's leader.
• The Ultimate Spider-Man (2012) episode "Itsy Bitsy Spider" has Loki utilize his Norn Stones to turn Spidey, his team, and Thor all into little kids (represented in the series' chibi art style), all so that he can claim himself the elder brother. The example is twisted a bit, as the characters all act and think the exact same, just a lot smaller.
• Victor and Valentino: Victor, Valentino, and Don were turned into babies in "Escape from Bebe Bay" after they used too much youth cream.
• The Wacky Adventures of Ronald McDonald: Birthday World has the plot involve Ronald and friends being turned into toddlers and babies by Professor Pinchworm as part of the evil scientist's plan to conquer the world by de-aging the rest of the planet's population. Pinchworm turns into a toddler himself after the gang foil his plan and return to their normal ages.
• The WordGirl episode "Big Baby" has Mr. Big accidentally transforming himself into a baby using his new invention, forcing Leslie to watch over him.
• Yogi's Treasure Hunt: In "Secret Agent Bear", Yogi and his friends spoof the James Bond movies. During this time, they accidentally fall into the Fountain of Youth, turning the adults into little kids and the kids into babies. When Dick Dastardly discovers the water's effects, he plots to use said water to turn the world's leaders into babies so he can take over the world. When Yogi and his friends foil Dastardly's plan at the end of the episode, Dastardly and Muttley get turned into babies.

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