DD is tongue tied, and I successfully breastfed her until she was about 14wks. I weaned her onto formula then as it had become a fight to feed her, not that she couldn't do it, she just didn't want to. She was a plump bub so she was gaining weight well.
She still has her tongue tie, but it doesn't hinder her in anyway. She just can't poke her tongue out too far. DP also has a tongue tie and has never had any issues with it. They both just look a little funny when eating an ice-cream tongue
DP never had any speech issues, and so far at 2yrs 3mths, DD is talking really well and has even mastered a couple of sounds DS who is 4 hasn't quite got yet.
See what your Dr says, our Dr said DD's wasnt too bad, so we would leave it and see how it went and we had no issues, but if she had have had problems feeding etc, then he would have snipped it.
Come to think of it, I had a friend in school who was badly tongue tied, and apart from her being a little self concious of it, it caused her no problems.
Ben 25/10/06 + Erin 10/9/08