Given the child's age he is old enough to know better and I agree a letter drawn up which states that the next time he bites the parents will be required to come and get him immediately and that he will be terminated on the spot.

Personally I would replace him anyways and not wait for another incident because if you don't then you will soon have the other parents in your daycare looking for another place instead. He is a liability.

I agree to a certain extent with the father in that I always hated it with child with learning disabilities to find out there had been an incident at school I was expected to punish for at home. Behaviours like biting, hitting, etc are in the heat of the moment and should be dealt with then. Child doesn't show the behaviours at home most likely since they are not being challenged by the other kids.

An option for at daycare is to simply institute a waiting chair which child must sit on when you need to leave the room or be busy and he just sits there till you return. Remind him it is because he forgets the rules when alone. Won't really teach him anything but will protect the other kids.

Will child start school this year or not? If yes then let him go in favour of a full time child and if not I probably would look to replace him anyways. If he was 2 and doing this it is one thing but at 3 1/2 he could really do damage on an infant or toddler if he bit and drew blood.