what are steps of changes fromchildhood to adulthood on the muscl.system?

Question

What are the steps that the muscloskeletal system goes through fron childhood to adulthood to reach 206 bones?

Answer 1

In summary, most of the cartilaginous part of the skeleton fuses to become bony, which subsequently results in fusion of bones, causing the number of bones to reduce to 206 in adults.

I would like to give the example of coccyx (tail bone). In infants, it is composed of 4 separate bones, but later on as the development proceeds, the cartilage between the individual segments calcifies (becomes bony) and as a result there the bone exists as one single piece in adults.