He seems to get cross very easily. One minute he is absolutely fine and the next he is slamming doors and shouting at me. I have no idea what to do. Sometimes he is lovely, wanting hugs, playing with his little sister (18 months) and being affectionate and then the slightest little thing happens and he seems to lose it. I have read about the testosterone surge in four year old boys. His behaviour changed about six months agao and he turned four two months ago so it does tie in. I know school may have made a difference too. But if anyone has any advice please pass it on.