You’re born with 300 bones, but by the time you become an adult, you only have 206

You’re born with 300 bones, but by the time you become 

an adult, you only have 206

• A baby’s bones are not hard and strong like an adults bones but slowly, year-by-year the bones change and become hard and strong – it’s called ossification.
• When you're born you have about 300 bones but by the time you're an adult you only have about 206 bones because some of your bones join together as you grow.
• Your bones use calcium to grow strong and hard.
• Your bone cells are constantly being replaced. (Although an adult might be 35 most of their skeleton is under 10 years old.)
• The strongest bone in your body is your femur – your thighbone.
• The smallest bone in your body is in your ear.
• Your skull is made up of 22 bones