hi, i am also having this problem. my daughter is 13 months old, and has been biting on and off for the past 6 months. it seems for her that she does it most when she's teething, but she will bite anything and everything. if she is mad she will even resort to biting herself. i have tried the time out thing, the walk away and ignore it, or even sternly saying "NO, WE DON'T BITE, I WILL NOT ACCEPT THIS BEHAVIOR". but it only works for the moment. i am still looking for the way that works for her. i DO have an almost immediate cure for this. i KNOW it works, i've been through it. when i was younger, a friend of mine bit me, and her mother (my mother's long-time friend) caught me biting her back, so she bit me and i NEVER bit again... i did tell her that i was biting back, so she turned around and bit her daughter too, her daughter never bit again. i have seen a few ppl do that to their kids, and they all say that once they give them a nice hard (not hard enough to bleed, just to show them it hurts), then their child NEVER bites again. i myself have a hard time with this one. i tried biting her back one day, but could only bite in such a soft way that she thought i was playing with her (like when you "munch" on them to tickle and stuff) so it didn't work for me, especially since i couldn't bring myself to hurting her with the bite. it felt wrong for me, maybe if she were older, like 5 or 6 (like i was), then i'd know she knew why she was being bit, but as a baby, i don't think she would understand why she got bit, just that it's ok to bite, so i don't personally suggest it, but as far as i've seen, it's an IMMEDIATE solution to the problem. good luck, and let us know exactly what works for you, since it seems to be so common, i know i have to find something.