Why when we were baby/todler we speak "dah dah dah' in different tone to other people but when we are adults?

Its a communication is what has been referred to as babbling. Did you know that from within the womb, babies are trying to communicate. A return kick to a tummy rub, a punch to a loud song, these are the earliest forms of communication till the infant will begin to vocalize his or her communication from birth. Dahdahdaaah!!!!!!!!