Amanda, welcome to the area! I don't know it personally, but I just moved from Washington state to Kentucky so I know how fun it is to start over! I have a consultant in the NC area, she just moved there a few months ago. Can't wait to come up and check it out! Anyway, I had the same problem with all three of my children. They learned the habit from friends at daycare, sometimes it just comes as a natural "outburst." I can't say I agree with the biting back rule, but obviously it worked for others. I do however believe in disciplining my kids in a way that they get the picture. Each child is different, with my first it took time out and she figured things out. For my second, time out just wasn't enough. She actually needed a stronger form. For her biting, it only took once, I "popped" her mouth, not enough to hurt, just enough to surprise her, and she stopped. My son was a cardiac patient for the first year of life so when I surprised him with a stern "NO!" He burst into tears and only did it once more. That was during daycare, playing football, he said the other kid was trying to push him down...when I asked if he had the ball he said, yes. Had to explain how it was not acceptable, considering he was sent home...and how football is played. Having a pacemaker it will be the only time he gets to play! Anyway, hope this helps, otherwise someone in school will bite her back and put a stop to it. Just hold your guns and make sure she understands that you are not happy, no laughing or any smiles when she does it. Good luck!