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A newborn baby has approximately 305 bones because a baby skeleton is mostly cartilage. As a person grows up, most of this cartilage turns into bone in a process called ossification. By the time they grow up, they have only 206.

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New born babies have around 305 bones. A baby's skeleton is mostly made up of cartilage. As a person grows up, most of this cartilage turns into bone in a process called ossification. By adulthood, the skeleton has just 206 bones.