Why do babies have more bones than adults?

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Why do babies have more bones than adults?
https://www.choa.org/medical-services/wellness-and-preventive-care/parent-resources/all/7-ways-kid-bones-are-different-from-adult-bones#:~:text=Babies%20have%20more%20bones%20than,and%20some%20bones%20fuse%20together.

I think babies are born with 300 bones but by the time they are adults, they have 206 bones. So almost 1/3rd of their bones fuse together.

Is there any significant reason that babies need all these bones or is this just a mystery in our anatomy?
Why do babies have more bones than adults?
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