Is it a boy thing?

So Emmit likes to hit himself A LOT. We didn't go through this with Grace, so we are thinking this must be a boy thing. He hits himself after we tell him no and he has started to throw himself down to the ground and kick and scream.
Is this normal?
Oh I almost forgot to mention the amount of head butting that is happening.
Are we going to be on Dr. Phil in 10 years?
Oh yeah and the little monkey REALLY likes to feed himself with his own spoon or fork. It's a mess, but totally worth moments like this.