A pregnancy that goes from conception to birth in at an extremely fast rate, often caused by an external (possibly supernatural) factor.
In Science Fiction, this is often because of some other hugely advanced race knocks up a different one, possibly a human, and the hybrid offspring gestates at an enormously fast rate, either normal for the other species, and grows to term in a matter of days. Or, if it's created like a robot, the creation is sudden and wasn't announced in previous episodes, and the whole process takes a very short time.
This is sometimes just when Writers Cannot Do Math or they are using Comic Book Time or Webcomic Time and lose track of what the hell is supposed to be happening.
Tends to go hand in hand with Fetus Terrible. Contrast with Longest Pregnancy Ever. Not to be confused with Instant Birth, Just Add Water, which is where the woman's pregnancy takes the usual forty weeks but her labor and (especially) delivery are implausibly quick. Also, please do not confuse this with Instant Home Delivery, which has nothing to do with birth.
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In Dead Leaves, Retro and Pandy have sex, and she is visibly pregnant roughly ten minutes later; Not long after that, the baby just kind of... comes out of its own volition, but ages super fast and dies in short order.
Fetus Terrible Yuca Collabel from Immortal Rain resurrects himself in a pregnancy that lasts little more than two months...and is already in the form of a prepubescent boy when he bursts out of his mother's stomach ala Aliens.
Squick for her and for the audience, but originally a occasion of mirth and rejoicing for the rest of the Avengers — including Beast offering to sit in as a living teddy bear for the resulting child — until Carol explains what happened to her and gives the Avengers an epic What the Hell, Hero? speech.
If she mates with one of her teammates, the offspring have other superpowers, as well - though in the case of the radioactive Socialist Red Guardsman's children, the birth was painful unlike any she'd had before.
In the aftermath of Marvel's Civil War, Tigra discovered she was pregnant by the Skrull impersonating Hank Pym. She disappears shortly after Norman Osborn takes power without so much as a baby bump, reappearing in time to take part in the Siege of Asgard. Afterwards she reveals that she'd already given birth to a son, William, in the time between her escape from Osborn and her joining the battle there. Handwaved with a throw away line about her race of cat people having two month gestational periods.
When Rahne from X-Factor reappears at the team's hq she looks about seven months pregnant leading poor Rictor to believe it's actually his child while she's actually only been pregnant for several weeks. This is explained in a throwaway line by her child being a wolf-god/wolf-mutant hybrid with wolves having an average gestation period of two months.
The Dark Destroyer in the second Atari Force comic book series pulls this on a backwater planet creature that he enters into to become born in the form of Martin Champion, speeding up the process to the point where it ends up killing the mother.
In theWomen Of The Otherworld universe, Elena's pregnancy only lasts five months, due to her being a werewolf. Somewhat unusual in that neither Elena nor her mate suspect anything unusual about her being as large as a fullterm pregnancy at only five months—Elena complains frequently about the inconvenience. Their cluelessness is justified since she's the first known female werewolf and thus she's having the first werewolf pregnancy. The Express Delivery is explained as splitting the difference between the duration of a typical human pregnancy and a typical wolf pregnancy.
BJ gives birth to her daughter Laurel in Nick O'Donohoe's The Healing of Crossroads after a three-month gestation. This is because Laurel's father is a faun; they mature quickly.
In The California Voodoo Game, a loa-spirit in the tournament adventure impregnates Mary-Martha and its offspring grows to full term over the course of a few dozen hours. Subverted in that the semi-divine fetus changes its mind at the last minute and decides to stay put, inverting this trope into the Longest Pregnancy Ever (possibly permanent).
In Anne Rice's Taltos, the Taltos grow faster if the woman in question is aware of her pregnancy and sings to them while being pregnant; this happens within a few minutes at one point. They also age superfast once actually born, becoming adults and able to have their own children within minutes. This leads to a very squicky scene in which a newborn Taltos is forced to impregnate its own mother before it is promptly burnt alive, for no other reason that the lols, seemingly. This is the most normal thing in a series full of incest, pedophilia, black magic and gratuitous bonking. (Yes, this troper isn't that fond of Anne Rice...)
In the second episode of Fringe, Our Intrepid Heroes were called in to investigate the case of a woman who got pregnant, reached full term, and gave birth in around fifteen minutes. The offspring died of old age in a half hour. The father was part of a government experiment and would also age very rapidly and ultimately did without regular doses of pituitary hormone. Oh, and the woman? She died.
This case gets called back in season 3, when Alt-Olivia's pregnancy is accelerated to delivery in a few days as part of Walternate's master plan.
Aeryn Sun does this in the Farscape: Peacekeeper Wars miniseries. Handwaved by her saying that soldiers of her species are genetically designed to become pregnant and come to term in a matter of a week or so and give birth in minutes (not to mention the part where a pregnancy can be in stasis without growing for up to seven years—my, but that military is efficient). It being a crossbreed between herself and the human John Crichton, labor to birth takes an incredibly long time—about half an hour at most.
In both Being Human and Being Human (Remake) Nina and her American counterpart Nora experience accelerated pregnancies of about twice the human rate of fetal development due to the fetus being a werewolf/half werewolf respectively.
In season one of Riget, Dr. Petersen's pregancy develops at a frighteningly fast rate. In the finale, she gives birth, to a fully-grown man.
Soap: Corinne has only been married a month but her doctor says she's five months pregnant. She swears she didn't have sex with anyone else during the four month mystery period but her husband doesn't believe her. She gives birth just a few weeks later; turns out the baby is a devil-child.
When Tucker in Red vs. Blue gets turned into a Mr. Seahorse by an alien, he gives birth to "Junior" in a very short amount of time.
Marsupials. They have a placenta, just like eutherians (placental mammals), but it's formed differently, so that its connection is weaker. Birth therefore happens in about 2-4 weeks, and the baby is still very small and embryonic. It makes its way up to the mother's pouch and continues its development there.
Aphids (the little white insects you sometimes see eating your rose bushes) are literally born pregnant.
The hack of Dig Dug called Baby Maker involves a naked man having sex with naked women underground. The sexual experience makes the woman plump up really quickly. At the end, a baby explodes out of the stomach. Dude sure is fertile.
The DS-only sequel to Ōkami, Okamiden, stars Chibiterasu, Ammy's son, and Susano and Kushi's son. Not so remarkable? The second game takes place nine months after the end of the first.
Kuni is adopted, this is made explicit after the end of chapter one, and Chibi is a demigod, same rules don't apply.
The game hints that Ammy shifting the Balance Between Good and Evil by defeating Yami is the cause of Ammy and all the other brush gods having children.
Dragon Quest V sees your hero's wife going through this: depending on how quickly you play through the plot, she can go from marrying you, to confirmed pregnant with your children, to having said children, in a matter of hours... or only a few in-game days.
Normally, a pregnancy in The Sims takes 3 Sim Days (3 hours of normal gameplay.) There exists, however, a cheat that allows you to reduce the pregnancy to less than 1 Sim Day.
In fact, there are mods that allow a female sim to give birth right after she gets pregnant
Justified, considering the length of an actual pregnancy would be impossible
Most Harvest Moon games have you wait 60 in-game days (two in-game seasons) from the announcement of the pregnancy until the birth of the child. Not Animal Parade. Exactly seventeen days after your spouse remarks, "If we're going to have kids, we've got our work cut out for us", the child is born. And the second one only takes fourteen days. Even in Harvest Moon time *
Rune Factory 2 and 3 have 15-day pregnancies. 1 and Frontier make you wait a reasonable amount of time.
In Baldur's Gate II: Throne of Bhaal, a romance with Aerie leads to a pregnancy that is rushed through within the storyline of the expansion, which is unlikely to take more than a few weeks of game time. Even slightly more absurd than by real-life terms, because she's an elf, and the pregnancy should take a whole year. There's no in-story reason for this, nor is it acknowledged. (Some have suspected Aerie of lying about not having been with any man before thePlayer Character, but that would make just as little sense simply for the reason that then she would have been very visibly pregnant already for a long time.) It is possible to play through the whole plot before the baby is born, hiding the timeline absurdity from view.