how come other mammals start growing teeth way before human infants ?

Question

I read that kittens start growing teeth around 2-4 weeks of age, for puppies it’s 6 weeks, but humans start getting them in around 6 months, why?

In: 2

Answer 1

Humans have to give birth a lot earlier than most mammals because we have giant heads to accommodate our giant brains. Any longer in the womb and the baby just wouldn’t fit out anymore.