Have you spoken to the nursery manager?- or just the nursery nurses? it maybe that the nursery nurses are not fully communicating what has happened to the manager, a tricky one but I don't think you should pull your child until you have exhausted the chance of getting to the bottom of it.nursery staff and teachers can be quite defensive.if you can change sessions that might be a help, but I agree you want to try and findout what their policies are on this sort of thing.good luck