Express Delivery

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, where the woman's pregnancy is depicted relatively normally but her labor and (especially) delivery are implausibly quick.

Anime and Manga

 * 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.

Comic Books

 * Happened to Ms Marvel in a fairly Squick inducing storyline in The Avengers in the Marvel Universe.
 * In the DC Comics, one member of the China's Great Ten is Mother of Champions, whose entire super power is her ability to go from conception to birth in three days. She also gives birth to litters of kids with Super Strength and who age ten years for every day they're alive.
 * 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 teams hq she looks about seven months pregnant  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 wolfs having an average gestation period of two months.

Film

 * Abraxas Guardian Of The Universe has the evil alien Secundus impregnating a woman, who not only gives birth in a matter of seconds, but doesn't even get her pants off.
 * It is natural for alien hybrids in Species to mature inhumanly fast. In the second film, they do it so quickly, they go out with a bang.
 * In the Robin Williams film Jack, the title character is born rather improbably, and quite unexpectedly, at 10 weeks' gestation; this reflects his 'four times normal speed' growth rate.

Literature

 * pregnancy in Twilight, due to
 * From Dune Messiah, Chani's twins come to term superfast
 * In the Women of the Otherworld universe,
 * Occurs in two Christopher Pike novels - The Grave and The Last Vampire 4: Phantom.
 * Done artificially to heroine Morn Hyland in Forbidden Knowledge from The Gap Sequence. The pirate who was holding her prisoner was irritated that her pregnancy was making it hard for him to rape her. (Why yes, it is a Stephen Donaldson novel. How could you tell?)
 * gives birth to her daughter Laurel in Nick O'Donohoe's The Healing of Crossroads after a three-month gestation.
 * In The California Voodoo Game, a loa-spirit in the tournament adventure impregnates  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).
 * Anne Rice's 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, for no other reason that the lols, seemingly. This is the most normal thing in a series full of incest, paedophilia, black magic and gratuitous bonking. (Yes, this troper isn't that fond of Anne Rice...)

Live-Action TV

 * Deanna Troi has an express-lane pregnancy courtesy of a passing energy being on Star Trek: The Next Generation.
 * "The Alpha Child" in Space: 1999.
 * Taken to extremes in Garth Marenghi's Darkplace, when a man is raped by the mutated eye-ball of a sex offender and then immediately gives birth.
 * On Xena: Warrior Princess, Gabrielle carried and gave birth to her Fetus Terrible in one day.
 * 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 without regular doses of pituitary hormone. Oh, and the woman? She died.
 * This case gets called back in season 3, when
 * 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.
 * Combined with Mister Seahorse in the Round the Twist episode "The Big Burp". Pete becomes pregnant by holding hands with a dryad after peeing on her tree. After an accelerated pregnancy, he gives birth through his mouth while handcuffed to his worst enemy.
 * In The Young Ones episode "Cash", Vyvyan (male) appeared to go from conception to term in less than 24 hours. It's just that kind of show.
 * Happens to Cordelia (and several other women) in the season one Angel episode "Expecting."
 * And again when, though this one lasts at least a few weeks or possibly months in-story.
 * Sort of invoked in Torchwood, when.
 * Tess in Roswell after sleeping with
 * "So an Altron pregnancy lasts only six weeks?"
 * In both Being Human (UK) and Being Human (USA) 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,

Machinima

 * When Tucker in Red vs. Blue gets turned into a Mister Seahorse by an alien, he gives birth to "Junior" in a very short amount of time.

Music

 * In the Abigail album by King Diamond, Miriam becomes pregnant and gives birth to the Fetus Terrible Abigail in the same day.
 * This happens repeatedly in the music video for Chromeo's "When The Night Falls" via Distracted by the Sexy. However, it becomes Fan Disservice/possible Nightmare Fuel in a hurry, but turns out to be.

Video Games

 * 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 Okami, 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.
 * 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.
 * 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, that's equivalent to a month and a half. But who wants to wait two months to see their kid, anyway?
 * 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 the Player 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.
 * 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 the Player 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.

Real Life

 * 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.