Have a ds 3.1 and dd 10 months. Ds has always been a bit of a handful but recently he has become much, much worse. He went a bit off the rails when dd was born (understandable I know) and we made some allowances for his behaviour whilst still being consistent with setting boundaries. Although he was pretty hard work (tantrums, biting, hitting) his behaviour was only directed at dh and me, so we got on with it. However, in the last few weeks he has started hitting/pushing/kicking and throwing things at dd. Often he'll say it was an 'accident' even when it's clear he knows he's done something wrong. We have explained until we're blue in the face why the behaviour is wrong, send him to his room for timeout, shout at him (although try not to) but nothing seems to work. Has got to the stage where I spend all my time trying to keep him away from her as I'm scared she'll get hurt. Please can anyone advise...in tears tonight as I just don't know what to do. Thanks.