My 11 month old son has been bitten very badly on the face by another child at his nursery. This is the 4th incident by this particular child! I don't know how frequent these incidents are, who else was bitten or who the biter is. I feel the bite to the face is particularly nasty (please see the photo). I know it's difficult to be the parent of a biter. However, I am still angry that this happened. Am I being unreasonable to assume that what ever measures have been put in place are not working. And demand further action?