I am sorry, I can't offer any help, but one of my twins is a biter... but he only bites his brother. I tried to bite him back one time, and the next day he bit someone at the babysitter's, so I don't recommend that. I have also tried time out, spanking his butt, tapping his mouth, giving him lemon juice, the doctor's idea of telling him no "in my most disappointed voice" and giving the bit child all the attention (it will hurt the biter's feelings and he will catch on after a couple of times) with no success. I will try the suggestion of vinegar, but since he seemed to like the lemon juice, I dont' know if that will work either. The babysitter has put Oragel on his tongue, and she said he didn't like that because of the bad taste - and he seems to bite less there than at home. My biggest problem at home is that he ALWAYS waits until I leave the room to bite, so it is harder to catch him in the act... and harder to determine the reason for the bite (his brother has a bad habit of taking everything from him - I'm also trying to break that one... unsuccessfully). I have witnessed him biting his brother for absolutely no reason, so it is not always "retaliation." I can honestly say that I do feel that it is for attention. He is more of a leader, much more independent than Tyler, and Tyler is somewhat of a "momma's boy" right now, so I (yes, I said I) feel like Casey doesn't get as much attention because he doesn't seem to "need" attention. I usually catch it when Tyler is crawling all over me and Casey is off playing by himself with his cars or something. I try to get Casey involved, but he acts like he enjoys playtime without Tyler trying to take everything away from him, so he usually tells me no. When he does try to get some "mommy time," Tyler has to get on my lap too. I know I am rambling, but I wanted to explain why I think this girl is probably trying to get attention. I am going to start "one-on-one" time with each of the boys because I think they are getting old enough to recognize and understand what that is (they will be 2 next month). I work full time, but my kids are very important to me. If my chores at home have to wait until after they go to bed, so be it - I want to spend as much time as possible with my boys. I am even going to start giving them separate nap times on the weekends whenever possible. Try giving her extra one-on-one time and see if that helps. If it does cut down on the biting and tantrums, tell her mom what you have done to stop the problems there and she should get the hint. Good luck to all of us!