Sure, all babies are cute, but that doesn't mean they aren't also extremely weird. Babies are eating, sleeping and pooping machines that double their weight in their first few months of life. And they pack a whole lot of oddness in while they're at it.

Here are 10 ways babies are much weirder than adults.

1. Babies grow mustaches in the womb. And then eat them.

During the second trimester of pregnancy, all babies (boys and girls alike) grow fine hair on their upper lips that then spreads to the rest of their bodies. In most cases, University of Sydney anthropologist Stephen Juan tells The Register, this hair — called lanugo — falls out before the baby is born and is reabsorbed (or eaten) by the baby in the womb.

2. Babies don't have kneecaps, sorta.

Baby sucking on toesLook, Ma, no kneecaps! A baby's lack of kneecaps and supple bones gives him amazing flexibility. (Photo: hartphotography/Shutterstock)

Have you ever noticed how flexible a baby is? This is partially because babies have soft, supple bones and large sections of cartilage. A newborn baby's patella (kneecap) is made almost entirely of cartilage, says WebMD. As they get older, areas of hard bone start to form, eventually hardening into a kneecap around age 10-12.

3. Babies have more bones than adults.

Baby in skeleton costumeIt's hard to believe that so many bones fit into such a tiny package. (Photo: Dmitrijs Dmitrijevs/Shutterstock)

You might think that their little bodies would house fewer bones than adults. But babies are actually born with around 300 bones, whereas adults only have 206, reports KidsHealth. As time goes by, some of those bones ossify or fuse with others to create bigger bones, particularly in the spine and skull.

4. Newborn babies don't shed tears.

Newborn baby cryingNewborn babies don't have the tears to back up their sorrowful cries. (Photo: Jaromir Chalabala/Shutterstock)

Sure they shriek. They wail. And they can kick up a good fuss. But newborn babies don't shed tears. While their tear ducts and glands are working, they don't yet produce enough extra fluid to do anything more than lubricate the eye, pediatrician Vincent Iannelli tells Parents. Those big, fat baby tears don't come along until the baby is a few weeks — or even a few months — old.

5. Babies develop a sense of taste before they're even born.

Baby laughingIn the womb, babies are born with taste buds all over their mouths, allowing them to taste a variety of flavors. (Photo: Flashon Studio/Shutterstock)

Even in the womb, babies start developing a sense of taste. During the first two weeks of pregnancy, taste buds start forming where a baby's tongue will be, reports What to Expect. These receptors will eventually allow them to recognize flavors — sweet, sour, bitter and even umami, a recently identified taste associated with hearty, savory foods like meats and mushrooms. What a pregnant mother tastes, her baby tastes too.

6. But they can't taste salt.

Stern babyMaybe this baby isn't happy because he can't taste salt! (Photo: Kichigin/Shutterstock)

One taste they can't sense? Salt. Research suggests that newborns cannot taste saltiness until they are about 4 months old.

7. They prefer to turn to the right.

Sleeping baby with head turned to the right.Researchers found that 65 percent of babies prefer to turn their heads to the right. (Photo: Vasilyev Alexandr/Shutterstock)

Researchers aren't sure why, but studies show that the majority of babies (about 65 percent) prefer to turn their heads to the right. And the preference may be connect to right-handedness later in life.

8. Babies can breathe and swallow — at the same time.

Breastfeeding babyAdults can breathe and swallow separately, but babies can do both at the same time. (Photo: Soloviova Liudmyla/Shutterstock)

Adults can breathe or they can eat, but they certainly can't do both. But babies can! From birth through the first few months of life, babies can breathe and swallow simultaneously, reports Live Science. That definitely comes in handy during those marathon nursing sessions.

9. All babies develop amnesia.

Cute and surprised babyAre you saying I didn't come from the stork? (Photo: Balic Dalibor/Shutterstock)

In a phenomenon known as "infantile amnesia," babies forget most of their first three years of life. Neuroscientists think this might be because the sections of the brain that record memory are not fully developed for a baby's first few years. Either way, it's the reason that most of us can't remember those carefree kneecap-less, mustache-eating days of childhood.