It is known that a person has 350 bones at birth, but by adulthood their number decreases to 206. So why should this happen if in theory everything should be the other way around?
The fact is that changes in the number of bones in the skeleton are associated with the process of human evolution. For example, babies have milk stitches, which are soft areas on the skull. Over time, these stitches close and eventually a strong skull is formed.
The main factor associated with decreased bone number is ossification. In other words, it is the process of soft tissue eventually turning into bone. This happens in newborns. It consists of cartilaginous formations, some of whose elements later turn into bone.
As the child grows, some bones fuse together. This happens, for example, in the spine. The same applies to arm and leg bones.
Therefore, the skeleton of an adult becomes less mobile than the skeleton of a child.
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Source: Ferra
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