If you practice positive parenting, how do you handle your LO hitting and kicking? I'm looking for some phrases DH and I can memorize to hopefully be consistent. DD has been more aggressive since her sister was born and we want to help her work through her feelings.

ETA: She is 3.5 and baby is 10 weeks old. It seems to be an issue mostly at home but there was one day at home where it was bad enough that the teachers mentioned it at pickup. They said it was out of character for her to be so aggressive there and I think she was just extra tired that day (fell asleep after midnight the night before).