Child singling one child out to bite

My son is 16 months old, and has a history of biting, mostly when he is teething.  He recently began biting again, and he is getting one more tooth in.  The problem is that he is singling one girl out of all of the children at day care to bite.  This is the same girl that he singled out a few months ago, when he was getting a bunch of teeth in.  Unfortuately, her parents have threatened to have him kicked out of the daycare if he does not stop.  We had a 'parent/teacher' conference this afternoon, and want us to take him to the doctor and get her opinion, unfortuately, since it's was after 5pm on Friday, I can't do that until after he goes back on Monday.  I think he's only biting because of the teething, but he also isn't doing at home either.  And it's always this one girl.  Why would he single out just one child, and what can we do to stop it?  I would hate to have him kicked out because we love this daycare, and the teachers love him.  He gets along with all of the kids, including this girl.  Also, this girl is 17 months, and the same size as he is, and there are much smaller kids in the same class, including ones not big/old enough to walk yet.  So, it's not even that she's an easy target.  He's a VERY happy, smart child, and loves to be with other kids and adults.  Except for the occasional tantrum, usually when he's tired, he's absolutely wonderful to be around, and makes everyone smile and/or laugh when he's around!

[Kevin Kennedy, Ph.D.]

To be frank, this should be relatively easy for the daycare person to manage. She simply must not allow your son, for now, to be next to this girl. My guess is that it is somewhat of a coincidence that it is the same child he is biting. Here's what I mean: my guess is that he is not singling her out, so to speak, but that she happens to be intruding on him in some way (it could simply be that she wants something he has), and he is acting aggressively toward her. He should be placed in time out at the least sign of aggressive behavior. I don't think there's much to be gained from having his pediatrician examine him, but if it will satisfy the daycare provider then of course you should do it. What does she imagine the doctor is going to say or do? This is not uncommon behavior in children of this age; it simply needs to be manged and it will be fine.