Making bonesBaby's bones are consist of a very soft and bendy substance called cartilage. Slowly when the baby keeps grow, the cartilage hardens and transform into bone.
More and Less
You were born with more then 300 "soft" bones, but as you get older dan bigger, many of the bones became fuse together. By the time you are 23 you will have 206 fully formed hard bones inside your body.
Baby bones are entirely consist of soft and growing cartilage.
Adolescent bones are mostly bone, with a small amount of cartilage
Adult bones have stopped growing. Most no longer contain cartilage.
Cross-section of an ear the cartilage sits between two layers of skin.