I have a 20 month dcg who has started biting. She has done it about 4 times in the last couple of weeks. I cannot find any reason as to why. The kids and I will be on the floor playing and everything is fine and all of a sudden she's biting. There was no fight over toys, its not retaliation, everything was fine just prior to each time. I have always been withing arms reach. I dont know what to do. after the first time i've been shadowing her but the second time she did it, we were playing with blocks and my 2y.o gave her a car and she went to hug him. How nice I thought and she bit him on the shoulder. So i have been making her keep hands to herself completely. I have an 11month old who crawls and my biter was sitting beside her and she leaned over and tried to bite her on the top of the head. I grabbed her before she could hurt her badly but she still made contact. And today my 2y.o was sitting at the play table and we were doing puzzles and my biter was playing with cars on the table. She dropped her car and went under the table and bit his toe. I dont get it. I've told mom each time and she is horrified. the 2 kids she has bitten are siblings and i cannot afford to lose them both because of this but i also cant afford to lose the biter either. I dont know how to handle it. I dont know if this has any bearing but my biter has not been herself lately because of her 2 year molars. She's constantly got fingers in her mouth etc so i dont know if that has anything to do with it or not. ugggh .