We noticed at three months old that my now 26 month old has a pretty severe upper lip tie. At the time when we found it, it wasn't causing any pain or issues, and he was compensating well with his latch. The skin had already thickened quite a bit, and we decided not to clip it because it wasn't causing any problems.
Not too long after that I started getting blebs...maybe one every 2-3 months. At around a year, his latch got really lazy and shallow and I started having minor irritation on one side (oddly, not the other side). I consulted his pediatrician about clipping it, and he totally brushed it off, telling me that he would eventually fall and tear the frenulum, and since he'd probably wean soon (ha!) it wasn't worth clipping.
The irritation has never gone away - my right nipple is always red and dry. I brought it up with a different pediatrician when he was 18 months and got the same answer - not worth it. Apparently at this age it requires general anesthesia and is not as simple as clipping a day old infant.
A few months ago I took him to the dentist for the first time and found out that he has decay on the backs of his top lateral incisors, which I know is a result of the tie (not being able to clear milk from his mouth, letting it pool around those teeth, especially at night). The dentist confirmed the tie, but even he told me not to clip it (same reasoning, he's going to wean soon). He nurses like 12+ times a day and a few times at night - I don't see this kid weaning soon.
I've found a dentist who uses a laser to clip ties and will even do it without GA.
My question now is...would he even change his latch at this age if we do clip it? I can deal with the irritation; my main concern is halting the damage being done to his teeth. I asked a lactation consultant, and she said she really didn't know...so I'm hoping someone has some personal experience to share.