Can anyone offer advice.. we have a 12 year old, a 3 year old and a 10 old week old baby. The 3 year old girl seemed to have settled in with the idea of a new brother but over the last couple of weeks her behaviour has deterioriated... tantrums morning and night and trying to hit her brother as well as taking his socks off and hiding them. She has been very good at nursery but now her behaviour has got worse there too... refusing to eat lunch and starting on the poor kid next to her at lunch today. She has active and regular schedule.. nursery every morning and goes to ballet and swimming lessons as well as plenty of attention from us. Please help.........