K.N.
First this is perfectly normal, second he will NOT really hurt himself, he will quickly learn what toys really hurt and what toys it's just kinda fun to do it with, my oldest used to bang his head on the floor and there have been several posts on here about such behavior. but like any other behavior in a child so young it's all about cause and effect, obviously make sure he has soft toys or at least toys wihtout sharp pointy edges for right now, and let him go, he'll get tired of it sooneror later and he'll be jsut fine.