My midwife was just telling me yesterday that there is some evidence that some babies go through a bit of a teething phase without any teeth actually popping through around 2-3 months. She said it's like the mouth is sort of getting ready, the teeth move up into the gums a little more, but sometimes you won't actually see any teeth. And most babies do get fussy/drooly around this time, then it often goes away and you might not actually see any teeth for months. Though if early teething runs in the family, he may get an actual tooth too.
My oldest didn't get her first tooth until 10 1/2 months old. It didn't affect her latch at all, at least not noticeably, though she did pop off and on a bit while she was actually teething and she bit me once while nursing (before the tooth was actually through, thankfully she's never bitten since then).
Lindsay - DD1, born posterior and chin up at home, Aug 2007
DD2, born at home in the water, March 2010