There is a toddler at my son's nursery who is biting other children. The problem is behavioural, rather than related to teething, and first came to light about two months ago. Since then the nursery has dealt with the continued attacks by speaking to the child's parents about ways to change his behaviour and having staff supervise him more intensely, to prevent any more attacks. But last Friday DS (20 months ) was bitten again by this child. The first time he was bitten a fortnight ago, teeth marks were visible for several days. I am upset that he has been biten a second time. I spoke to the nursery yesterday and they confirm there hasn't been any real improvement in the child's behaviour as yet. They are using time out and intervention to control his behaviour, but how long should this go on for? What should I do?