I have a 2.7 year old DD1, as well as an 8 month old DD2. Up until now they've always been fine together, although DD1 would occasionally be too rough/careless when tired. Normally I would stop DD1 and ask her to apologize, and if the behaviour continued I take DD1 out of the room to sit by "mr naughty" until she was ready to be gentle.
Then came this week... And every time I shift my attention from the girls, DD1 deliberately does something to hurt DD2. Slapping, pushing her over, snatching toys, stepping on toes, etc. We're stuck in a vicious cycle: Slap, time out, "sorry", Slap, time out, "sorry", and it goes on all day.
I've tried engaging them in positive play together, which works to an extent. But the minute I have to go to the toilet or DD1's attention wanes, we're back to smacking again. I've removed toys and left outings in response to her aggressive behaviour, and it does upset her but does not seem to be a deterrant.
I can't leave them alone together & my house is falling apart! Any ideas?