I am aware that it is perfectly normal for siblings to fight, and for the first born to be jealous of the second born and so on. But I am at my wits end trying to stop my nearly 4 year old son from constantly battering my 18 month old daughter. He doesn't seem to be able to stop himself. Tonight he pushed her off the side of an armchair. It could have been extremely dangerous. I'm genuinely worried that he will do something like pushing her down the stairs. I don't want to hit him (I have never hit either of my children as I was constantly hit as a child and all it did was make me resent my parents) but I don't know what else to do. We've tried everything, from the naughty step, putting him in his room, banning him from watching TV/using the computer, and so on, but nothing stops him. Please, if anyone has had a similar situation and tried something that worked can you let me know. Otherwise I'm afraid that the next time he does it I'm just going to belt him!