My ds is 3 next week. He has been going through a phase of pushing, hitting and slapping other children for about 3 months now. Usually when he does it I take him home, do time out etc. I figured he would grow out of it in time. Within the last two weeks, he has progressed to biting. Badly. He bit a friends dd a few days ago on her upper arm which drew blood and she now has an infection which requires antibiotics. I feel so utterly dreadful about this, I ask him why he bites and he says he doesn't know, he just does it. I've cancelled his party (he threw a massive tantrum when i told him but tough) because I can't constantly watch what he's doing and i would hate for this to happen again. I suspect he was bitten by another child at some point which is where he has learnt it from. I feel our only option is to keep him away from other children until he stops. AIBU?