Human infants have around 270 bones, which later fuse to form 206 to 213 bones in adults. The reason for the variation in the number of bones is that different people may have different numbers of vertebrae, ribs, and digits. They come in various sizes, shapes, and strengths to meet the needs of fine-motor or strong-arm activities.
About 300 bones make up the body of a baby at birth. These ultimately fuse to form the 206 bones adults have. Some of the infants’ bones are entirely composed of cartilage, which is flexible and soft. As we grow, the cartilage expands and is gradually superseded by bone with the help of calcium.
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