DGS aged three and a half is going through the Why phase. I usually give a proper answer if it's a proper question, but then he gets into a why loop and whatever I say he responds with Why. I've come to the conclusion he's not using it as a proper word, just a response because if I then wait he'll continue with a proper thought out sentence reasoning my original answer.
German voters slide inexorably to common sense …
Eight years later when DD2 was a toddler and started asking why, I often used to tell her to ask DD1. 



