DD1 (2.6) has been really good since DD2 (4 months)arrived, no signs of jealousy, wanting to help change/bath her etc. But recently a couple of times she has really made her cry and seems to think it's funny.
I sometimes need to leave them in a room alone together, such as popping to the loo, or if I'm in the kitchen and they're in the lounge right next door where I can see them. Twice now I have left them alone just for a few minutes and have come running back to the sound of DD2 screaming and DD1 giggling. The first time she said she tickled her, the second she poked her in the eye. She was sent to the naughty step both times but still seemed to think it was really funny. So I thought, ok, just never leave them alone together, lesson learned.
But just now I was playing with DD1 while bouncing DD2 on my knee and out of nowhere DD1 just 'tickled' her really hard in the face, making her cry, then she laughed. I asked if she thought it was funny hurting her sister, did the whole 'look, she's crying, you hurt her, that's not nice' etc but she still carried on laughing. Sent her to the naughty step but I was so mad,and it just didn't seem to sink in.
Is it jealousy? Attention seeking? I originally thought it was because she knew making the baby cry was a sure fire way to get me to come back in the room, but why would she do it when i'm right there? And show no remorse whatsoever? She is not normally naughty. I'm just at a loss how to deal with it especially if it carries on.