Parents and caregivers working together for a solution can provide the extra resources needed to get through this difficult, though normal, developmental behavior. Offer children information. Children don't automatically know that biting hurts. Telling them that biting hurts, and allowing them to observe the bite mark and the crying friend will help them learn, over time, that biting is hurtful to others. Provide redirection and alternatives.
Toddlers are like two-ton trucks.
When they get going with an idea, it can be hard to stop them. Our best strategy is to redirect their energy. We can do this by providing alternate things to bite. You can bite this plastic hand, but I can't let you bite people. You can bite it when you feel like biting.