Eli5: Why are human babies born so ill prepared for the world, compared to some other mammals who are born much more well equipped?

Question

Eli5: Why are human babies born so ill prepared for the world, compared to some other mammals who are born much more well equipped?

In: 2

Answer 1

This is something called altriciality, which most marsupials, rodents, primates, cats and dogs have, and several species of bird.
And the reason for why, is cause birth is easier that way, imagine if pregnancy lasted for 2-3 years instead in humans.