1. Nipple stimulation is the only scientifically proven method of legitimately bringing on labour.

Rubbing or rolling a woman's nipples when she's full term can stimulate the release of a hormone called oxytocin, which can cause contractions. This method is called "the comfort technique".
2. The longest known pregnancy lasted for a year and 10 days.

Pregnancies normally last around 280 days, but as Beulah Hunter from Los Angeles discovered, sometimes they can last over a year.
4. There are more twins born in Central Africa than in anywhere else in the developing world.

6. It's possible to fall pregnant through oral sex. In fact, one woman conceived after oral sex and a knife fight.

A girl from Lesotho born without a vagina became pregnant when she was stabbed in the stomach after performing oral sex on her boyfriend. Seriously. This is an actual thing that happened.
7. From the second trimester onwards, babies pee in the uterus. Then they drink it. Then they pee again. Then they drink it. You get the picture.

8. In fact, amniotic fluid is mostly sterile urine.

9. A baby starts making its first poo, called meconium, at around 21 weeks' gestation. However, it won’t pass it until after its birth.

11. Baby girls are born with all the eggs they will ever use, but boys don't develop sperm until puberty.

Although some new research shows that women can produce new eggs later in life.
12. Rabbits, dogs, pigs, whales, and humans all start as eggs roughly the same size (around 0.2mm).

14. For every 2,000 babies, one is born with a tooth.

16. Babies cry in the womb.

It's clear from 4D scans that babies frown in the womb, but scientists have also been able to tell from measuring their breathing patterns that unborn babies also cry. This, they say, isn't necessarily because they're upset – they're just practising.
17. A woman's uterus expands to more than 500 times its normal size over the course of a pregnancy.

19. In addition to her uterus, a woman's feet and heart increase in size during pregnancy.

Pregnant women's hearts grow to handle the increased volume of blood in the body, and feet swell due to fluid retention and the stretchiness of pregnant ligaments.
20. A baby's fingerprints are set within the first three months of pregnancy.

21. Orgasms can cause contractions.

Not true contractions, but Braxton Hicks or "practice" contractions. Don't get too excited, though, as simply having a full bladder can bring them on, too.