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Babies are born with about 300 bones, but grown-ups have only 206.

Babies are born with about 300 bones, but grown-ups have only 206.

As you grow, some soft, separate baby bones slowly fuse — join together — into single, stronger bones, for example in the skull and the spine. That's why adults end up with fewer bones than babies.

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Your heart beats about 100,000 times every day. Your heart beats about 100,000 times every day. You are a little taller in the morning than at night. You are a little taller in the morning than at night. You can’t tickle yourself. You can’t tickle yourself. Your bones are alive, and they grow with you as you get bigger. Your bones are alive, and they grow with you as you get bigger. Your funny bone isn't a bone at all — it's a nerve in your elbow. Your funny bone isn't a bone at all — it's a nerve in your elbow.