Hi N.,
I had the world's worst biter in my daycare. He had been kicked out of one daycare and was on his way out of another when he came to me. He was biting several times a day, every day for at least six months.
The way you can handle this works very well but you MUST be consistent with it EVERY time and for about 2-3 weeks, your child is not going to like you one bit. Use the same words each and every time you talk to him and you have to do this several times a day (25-30) for 2-3 weeks. Here goes!
Hey Sam, come here, please. (You are down to his eye level and use a very stern, low voice, one that says, you better pay attention) Sam, we don't bite. Biting hurts. Do you understand? No biting. We don't bite our friends/brother/cousin. Biting hurts and we don't bite. If you bite, you have to put your nose in the corner. Do you understand? No biting! (Wait for child to give you several nods of understanding throughout the conversation. This may bring on tears, don't worry about that.) Okay, now let's have a hug and you can go back to playing. I love you.
Fast forward, fifteen mintues later, interrupt his play or whatever he is doing...
Hey Sam, come here, please. (You are down to his eye level and use a very stern, low voice, one that says, you better pay attention) Sam, we don't bite. Biting hurts. Do you understand? No biting. We don't bite our friends/brother/cousin. Biting hurts and we don't bite. If you bite, you have to put your nose in the corner. Do you understand? No biting! (Wait for child to give you several nods of understanding throughout the conversation. This may bring on tears, that's okay.) Okay, now let's have a hug and you can go back to playing. I love you.
Catch him in the middle of whatever he is doing and keep this up. If you see that you THINK he may be thinking about biting, if he is getting frustrated, if he is perfectly content with what he is doing, if he is in the middle of a game, in the car, during bathtime, you stop and have this little chat with him. If he bites, love up the other child while your little one is in the corner. Blow bubbles with the other child, play a game in full view of your biter, do something really fun, that ends when your child comes out of time-out.
This worked with Sam...he bit twice in the first 45 minutes of his first day and never bit again. It was an intense 3 weeks, but he pulled through, I pulled through and his parents were eternally grateful.
Good luck and let us know how everything works out!
C.