My son is going to be 7 in a couple of days, he has been showing really agressive behavior at school, he has never shown this kind of behavior before. he has struck 3 children at school, and today his teacher has said that if this happens again he will be expelled. i am trying to talk to my son that hitting is wrong, but he still continue to do so. i am so stressed out and become very emotional about it i do not know what to do. we just moved to a new city and he is attending a new school, can that be a factor? i need some help and the people at school do not offer any advice on where i can get help.