LO is 22 months and just bit her sister today (3.5) and actually drew blood. I was at a bit of a loss since this is something she just started doing. I sternly told her it is not ok to bite, repeated that a few times, and had her apologize to her sister. On the flip side, her older sister has done her fair share of hitting/pushing/sitting on over this past 6-9 months. I know kids have these behaviors but is there a way to stop it? Or at least keep it somewhat controlled? I don't want them beating up on each other every time one of them gets upset.

Did your LO go through a biting phase? How did you handle it?