My daughter Iris is 3. Here is a little back ground on her behavior. She started hitting me when she was 8 months old. That sounds like it might be typical baby behaivior but I knew right away something was different about it. She has been violent ever since. Hitting, biting, hair pulling, scratching, pinching, punching, and kicking. For the most part is all directed at me. I am greatful for that because I wouln't want her hurting other kids. However, I often feel beat up. She is defiant and oppositional. She argues about everything and rarely just cooperates. She has frequent potty related regressions. She throws loud angry unstopable tantrums multiple times a day. I often feel like she is angry with me or that she is out to get me. I feel like that sounds ridiculous but I am just being honest. I have not had her evaluated although I have talked about her at length with my therapist. I'm curious as to when you knew there was a problem vs. just having an extremly diffucult child.