I work in a small nursery where I live and my daughter comes with me. For the past few months she has been biting the children through pure frustration. There is one particular boy that she always does it to and the parents have complained and then today she bit him twice. Utter Nightmare. I have tried biting her back, telling her off, making her sit on a naughty cushion but nothing has worked and she is still doing it. Please help, I'm at my wits end.