My 18mo DS is incredibly aggressive and it's really starting to concern me. He's been like it since he was about 9 months but recently it's got really bad. He hits, bites, scratches, head buts etc. When DH and I ( am everyone else!) tell him no and to play gently, he just laughs. I'm really concerned that there's something wrong with him. Even his childminder said she'd never seen anything like it. I guess I'm looking for similar stories, advice or ideas. Thanks so much