I have a 20 month old son who has terrible temper tantrums. It isnt, however, the tantrums that upset me. It is the fact that when he is mad, he bangs his head. He hits it into walls, furniture, pavement, concrete, you name it. The upsetting thing is that he will do it once, and then cry because it hurts, but he continues to do it over and over again. He will sometimes do it 5 or 6 times before I can get to him to stop him. He gets large bruises on his forehead. Could this be a symptom of Aspergers? Should he get a helmet? What can I do to help him?