I just wanted to get some feedback about whether this behavior is normal. 13 month old DS is always banging his head on stuff. Sometimes he does it for no reason and sometimes he does it when he's angry or frustrated. For example, he'll find something on the floor in the kitchen and try to eat it, and when I take it away and he starts crying and banging his head on the floor. Then he cries even more because he hurts his head. Sometimes he also throws himself back suddenly and hits himself on something.
 The other day SO and I took him for a walk in his stroller and SO said "look he's biting himself". I looked down at his arm and he had bitten himself hard enough to leave bite marks. This behavior kind of freaks me out. I have a six year old dd and I don't remember her doing any of this stuff. Is this normal boy behavior or something I should be concerned about?











