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Newborn babies have roughly 270–300 bones, yet adults end up with just 206.

Why does the number of bones decrease as we grow?

Some bones get reabsorbed into cartilage and effectively disappear during development
Bones gradually wear down and erode away over time
Multiple separate bones fuse together into a single bone as we grow ✓

Multiple separate bones fuse together into a single bone as we grow
Through a process called ossification, bones that start out as separate pieces — such as those in the skull and spine — gradually merge into one. By adulthood, this fusion brings the total count down to 206.

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