How many bones does the human body start out with?

The human body starts off with 270 bones at birth, then that number decreases to 206 as the body enters adulthood due to bones fusing together

On average, a baby would born with 270 bones.

As we grow up, some of the bones would be joined together through various types of membranes in order make us able to do a much complicated movements compared to when we're still a baby.

At the peak of our adulthood, people on average would have 206 bones in total.