My 3 year old son has a really embarassing habit of lying on his front and doing what i can only describle as humping. I have talked to him about why he does it and he says that it makes his willy feel nice. do i need a psychiatrist or have other people had experience of this. Please tell me he will grow out of it. Thought about getting in touch with HV but to be honest my one never seems to know anything i cant read for myself in a book. is it somthing to worry about and will he just grow out of it. We have to make sure he doesn't lay on his tummy to play dead lions at parties!!!