Felicity has two teeth, the first one came right about 5mos old and the second one just before 6mos old. Fairly early- I hope she can hold out for the top ones. She only bit me a couple times and not even that hard, mostly when she was falling asleep, but I said NO and got her off and she hasn't done it since, so I'm hoping she doesn't try again once she has top ones too as that would be TERRIBLE.