Ever notice that are animal for the most part are born able to walk and communicate.
Did you know that you were born premature. All human babies are, why?
Simple it has to do with the evolution of the Human brain and the Human Female pelvis bone. It short the birth canal at some point in our evolution reached it's max size but the brain didn't. So in order to allow a babie to pass threw the birth canal humans had to evolve the ability to have premature babies safely.