They fuse because of age.
You do not really 'lose' bones but some fuse together. Particularly the bones in the cranium.
because fetal bones fuse together
Yes, we are born with over 300 bones and some fuse together leaving 206 in adulthood. Examples are the scull, sacrum and coxyx.
they fuse together
Babies have more bones than adults but the only way this is, is because numerous bones the babies have are not yet fused together. For example, the skull of a baby is several different bones, after a while they fuse together to form the complete skull.
Puppies' bones typically finish fusing together by the time they are around 18 months old.
The three bones that fuse early in life are the sacrum, which is formed by the fusion of five sacral vertebrae, the ilium, and the ischium. Together, these bones form the pelvic girdle, which provides support and protection to the organs in the pelvic region.
206, although infants will have more - these extra bones will then fuse together as they grow.
because as you grow up bones fuse together and become stronger
They fuse together.
Because children have more bones than adults. They is because the bones fuse together when the children are growing. A baby has 300 bones at birth. But because bones fuse together during the "growth period", adults have less bones and they end up with 206 bones.