Have totally created this problem, but... I have a ds 2.7 and a dd 16mo. His behaviour is really challenging and since his playgroup broke up he has driven me up the wall. He will not leave his little sister alone to the point where I just have to put her in her high chair for her own safety. His latest fun trick is to climb onto the back of the sofa and jump on her when she is on the floor. Or sit on her head. Or taunt the dog to dangerous levels... I have to have eyes in the back of my head and once or twice I have smacked his legs or bottom :( I does nothing to stop him he just frowns or even laughs... The naughty step is just a game :( Each time I have smacked him I have cried on and off all day it has been a total waste of time but now to make things worse he has started hitting everthing that gets in his way, the dog, me, little sister etc I feel so stupid WHAT DO I DO????? we say 'you musn't hit' DUHHH??? how confusing is that for him??? But what else can I do? Have I ruined everything?? please someone who has been in this situation help me or give me some advice? This is by no means constant but enough to have me worried :(