Boy did you open a can of worms asking for parenting advice. 🙂 I googled ” toddler who bites” and the first hit has this tidbit…
“If your child bites don’t re-tell and laugh about the incident in front of your child, no matter how funny it actually was. You hear of parents biting their child back so they know how it feels it be biten. This makes absolutely no sense if you think about it and look at this through the childs perspective. The child bites someone, is told that you don’t bite people and then gets bitten by Mom or Dad. Where is the consistency here? There isn’t any.
The child will learn from the Time-Out method as long as you are firm and consistant. He will learn that biting is unacceptable and that it will not go unpunished. Parents will also be a good role model by not biting their child back. With this approach your home will be a happier healthier and safer place for everyone.”
It goes on to say biting is out of anger or frustration at being unable to communicate. Just letting you know there are two sides to the “do it back to the kid” theory. When in doubt, follow your heart. I think it will tell you the right answer.