When you were born, you had about 350 bones. But by the time you finish growing, you will have just over 200! The missing bones won't have fallen out or disappeared. Instead, as you get older, some of your smaller bones will join together to make bigger ones.
[Without bones inside you to give you a shape, you'd be like a floppy, squishy bag.]
[Your bones are partly made of a hard stony stuff called calcium, but unlike stones they are alive. They get bigger as you grow up.]
[The longest bone in your body is the one above your knee, called your thigh bone.]
[Bones are hard and strong. They help to keep the softer parts inside you (like your brain) from getting hurt.]
[Most of us have twelve pairs of ribs, but some people have an extra pair. Your ribs help to keep your lungs and heart safe.]
[Although your skull is made of lots of bones, most of them are fixed together. Only your jaw bone moves.]
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