I have twins who have just turned 2. One bites the other constantly. There does not seem to be any malice involved, they will be playing nicely and then one bites. Unfortunately the bitten twin is often covered in nasty bites. He is becoming quite traumatised by it all. I give the bitten twin a lot of attention when he is bitten and ignore the biter. When I have tried to discipline the biter, through time out or shouting he just laughs.
I have asked my HV for advice and she said the biter would grow out of it.
The pharmacist suggested keeping the bitten twin topless and slathered in sudocrem so that he tastes bad to the biter!
Everyone else, my mum, MIL, playgroup ladies, childminder etc says I should bite the biter every time. I just can't bring myself to bite my child. It seems barbaric but on the other hand the bitten twin is in pain.
YANBU: Do not bite your toddler
YABU: Bite your toddler