Many of the new born babies " bones " are actually seperate pieces of soft, flexible cartilage that gradually fuse together as they grow.
New born babies born with 270 to 300 " bones ", an adult skeleton has only 206 bones.
Having multiple, seperate skull bones allows the baby's head to compress slightly. It helps in natural way of pregnancy.
Flexible spots between skull bones provide room for the brain to expand quickly during infancy.
Pliable skeleton helps the infants to absorb the effect of falls and tumbles while they try to learn crawling and walking.
As the person matures, calcium and other minerals harden the soft cartilage to solid bones.
Similar bone segments grow together to form single, larger and stronger structures.
This is notable in skull, spine and pelvis regions.