How many bones does a newborn baby have?
Not many, newborn infants have more cartilage than bone at birth. This is why newborns are so limber, cartilage is more pliable than bone. Bones form and develop over time by a process called endochondral ossification. The cartilage is slowly replaced by calcified bone matrix, it is remodeled by the action of osteoblasts and osteocasts. Calcium salts are slowly laid in the cartilaginous tissue and form hardened bone tissue, this is called calcification of the bone.
A good example of this process is the development of the infant cranium. Newborns have "soft spots" or fontanelles in the skull that slowly grow, calcify, and fuse together to form the hardened bones of the cranium. When the bones eventually fuse together or articulate they form the cranial sutures.
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