My ped said that he should go around a year but since we only had two teeth then, he said we would just wait. We finally got teeth during the summer so he said to go around two. I asked the dentist last week when I was there and she said wait until around three or four. I don't think they have any set rules.

"Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind." -- Theodor Seuss Geisel