My son has been biting for a few months now. He seems to do it mostly when he is tired but not always. I try to go to the victim first and not give him the immediate attention. Long story short- should I be keeping him away from all kids (He has a 3 yr old sister -and she has friends- you get my point)? Should I just keep close monitor on him? Should I limit his time with children? I want him to learn proper behavior and I know he needs disciplne for this. How do I do that at his age? Thanks!