I have a 4 1/2 year old son and an 18 month old son. My older son went through a horrible biting phase from 1-2 1/2. It stopped for the longest time until recently. Background: There is a 2 year old girl at the babysitter with my boys who on the first day but my child who was 6 mos. on the nose. My older son does not like this girl, when I ask why he just says "I don't know, but I don't like her." I have always repeatedly told him that we are kind to other people and while he may not like her he will be nice to her. The sitter has also told him that if he doesn't want to play with her, fine but he needs to be nice to her.
Well this morning I got a text that my son and another little girl were playing hide and seek, the girl he doesn't like tried to play and my son bit her on the cheek. I've seen a picture and I'm sure there will be a terrible bruise. I just don't know what to do anymore. We have tried everything we can think of in the past to explain to him about being nice to her and I'm at a loss. I know he needs punished but I don't want to punish without him understanding and learning. I want to teach him how to make a right choice and I don't know how. Any advice would be greatly appreciated.