With my first, I dealt with it. Unfortunately for me, we didn't have it corrected for several weeks. I faced blistered nipples and clogged ducts when nursing because he couldn't latch properly. He was gaining weight, but having trouble nursing. DP finally made the pediatrician clip the tongue. It was a quick procedure done in the office. I was a little reluctant to have it done because I was worried it would be painful for him. It only took a few seconds and he was able to nurse immediately afterward. After he had it clipped, nursing went so much better. He started gaining weight really well and it wasn't a struggle.
I think it's good to find this out early on so you can have it corrected if you want. Our son hasn't had any problems since he was clipped. Our newest little one doesn't seem to be tongue-tied.