Catch in act/respond
Toddlers may bite less out of aggression
& more because it works.
Stopping another kid's advances or getting them to drop a toy they want may be their only thought. They often don't know it hurts, like they don't know "hot" until they get burned. If you can catch them in the act & scold them within 30 sec, they may quit. If not, bite once w/out breaking the skin & give them that educational point.