My 21-months old has started to bite other children, unfortunately it happened every day for the past week and - understandably so - the nursery starts to say that we need to get this under control if he is to continue in this setting. I think it might be teething and feeling his teeth itch because he usually isn’t upset when the biting happens. Any ideas what I could do? Nursery and I explain to him that biting is not ok and hurts others, but I’m not sure if he can comprehend this at this age, or even if he does, the impulse in this moment is stronger.