I keep pushing the book "
No Biting" by Gretchen Kinnell. It's designed for care providers and program directors, but parents should also find it very helpful. It goes into the MANY reasons that children bite, how to appropriately respond with a long-term cooperative plan, and how NOT to respond. While your program director of course will be setting policies and implementing them at the day care, I think parents should be informed so they can support the behavioral plan at home.