I took Arthur to the children's park in the shopping mall. He was allowed to play there all day, so I took him there twice, once is in the morning, the other is in the afternoon. He conflicted with other children and cried. I asked him what happened but he couldn't tell me. It seems his kicked someone in front of him, then they hit each other. I consoled him and told him that it is wrong to kick others.

Arthur is too young. He doesn't go to kindergarten. He doesn't know how to contact with others.