Babies aren't just cute, you know. There's a lot going on behind those button noses and chubby cheeks! Check out these facts you probably didn't know about bubs...

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1. In the womb, they grow a moustache

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iStockphoto

About four months into pregnancy, the unborn baby grows hair on its upper lip which then spreads all over the body. This soft, downy hair is called lanugo and it’s usually shed soon before birth.

2. They have more bones than you

A baby has about 300 bones when its born. But by the time they’re an adult, they’ll only have 206. This is because bones fuse together as we grow.

3.  Newborns can’t shed tears

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iStockphoto

Yes, babies cry a lot, but as their tear ducts are underdeveloped for the first few months of their life, they can’t actually shed tears.

4. They have big brains

A baby’s brain is 10 per cent of their total body weight. In adults, it’s just two per cent. The brain grows faster than any other body part. A newborn’s brain is a third the size of an adult brain…just 90 days later, it’s half the size.

5. Newborns don’t have kneecaps

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iStockphoto

Well, not proper ones. A baby’s knee is made of cartilage and it stays that way for a few years before becoming bone. So, on an x-ray, it looks like they have no knees!

6. Baby girls can have periods

While in the womb, babies are exposed to high levels of female hormones, and after birth these drop – which can trigger a one-off menstrual period. It’s nothing to worry about.

7. They dream…probably

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iStockphoto

Babies spend up to 80 per cent of their sleep cycle in REM sleep – when dreams occur – compared to just 20 per cent for adults. This means newborns could be dreaming for up to eight hours a day! But we’ll never know what their dreams are about…

8. Most have blue eyes

Most white babies will have blue or grey eyes but this doesn’t mean they’ll stay that way. Their true eye colour will develop before their first birthday. However, babies of colour are usually born with dark eyes that remain dark.

9. They’re super strong

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iStockphoto

A baby’s grasp is so strong, they can hold their whole body up (do not try this at home!). Called the palmar grasp reflex, this superhero strength vanishes by their first birthday.