My 4 year old is a bright, lively little boy. He loves learning, and is very social with his little brother and his friends. But over the last 6 months he has got quite disruptive and aggressive at home. He often hits me (I?m his Dad) and his Mum when he gets cross about something, and it can be something really trivial such as he doesn?t like the way I put one of his toys back in his wardrobe ! I?ve read the DSM-IV definition of ?Oppositional-Defiant Disorder? and I?m wondering if he has this, as he does have about 4 of the listed symptoms, which I understand is enough to be disgnosed with it. But is 4 years old too early to diagnose ODD? He is fine for the two days he spends at nursery and the nursery do not find him disruptive. He?s often also OK while we?re out ? it?s at home he has meltdowns that can turn violent towards Mum or Dad (occasionally towards his little brother too). We have tried time out and reward charts but so far they haven?t stopped this behaviour. Could it be that he is anxious about starting school in a couple of weeks? Any thoughts on the ODD issue?