human
Babies are born with far more bones than they'll have as adults, because many small bones later fuse together as the skeleton matures.
A typical adult human skeleton has 206 bones. Babies are actually born with roughly 300 separate bones, but as children grow, many small bones — especially in the skull and spine — gradually fuse together into single, larger bones, bringing the final adult count down to 206.
150 is too low a count for either a baby or an adult skeleton, and 300 describes a newborn's bone count, not an adult's, since fusion during childhood and adolescence steadily reduces that number over time rather than leaving it unchanged.
The exact adult count can vary a little from person to person, since some people are born with small extra bones called sesamoids, or occasionally an extra rib, meaning 206 is a typical average rather than an absolute rule for every single person.
human
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