S.M.
I know it's not easy and even a little embarassing. It may also be age appropriate, but it's in no way as "common" as some of you seem to think. It's absolutely possible for a child to never do this at all. Some will, some won't. If a group of children does not have a biter in the group, it's possible to have a small intimate group of daycare buddies that never do this for years on end. I've seen my daycare go 3-4 years without a biting incident. Once it gets started though, it's terrible and hard to stop. I would be very upset if I knew I was lied to. Refusing to tell this is the same as lying.
I don't know how big this group is. But it's going to be much more fair to the rest of the parents and the other children to find out if they are having a problem with it. If they haven't had anyone bite in a very long time they might not even want to take on a child who bites.
Once a child bites they are a biter. I'm sorry that the term seems to offend some, but how often are the moms on here asking what to do about their child being bit in daycare. Usually several moms come on to say pull out their child. I don't agree with that either once it's already done. But speaking from a providers perspective, you really have no right to keep this fact hidden.