This....I worked in daycare for many years as well with this age group. When I was there time outs were no longer than the child's age so 2 years no more than 2 minutes. For biting it was usual to get on their level and say something along the lines of "ouch poor Sally, she is sad now" ect and get the biter to help ice Sally's bite. Parents also had to always be told regardless of if their child was the biter or bitee. Of course all centres are different but they all should have policies on hand and all incidents should be recorded regardless.