When I was trying to find the exact number of bones in a newborn (adults have 206, kids have ~300, was looking for the number in a 9-month fetus, really), I found this answer to some other question…I don’t know why, but I thought it seemed relevant.
You’d be floppin’ around like a Raggedy Ann doll. You wouldn’t even be able to stand up, walk or even sit up in a chair. Without your bones you’d simply be a pile of organs, guts, skin, water and biochemical goo on the floor. You want bones. Bones are good.
All I found regarding newborn baby bone number is 270. I recall a few bones that develop after birth (like the patella), but I didn’t think that over 30 bones were formed between the initial count and the time that everything ossified.
L’anatomie de l’homme, suivant la circulation du sang. M. Dionis, 1723