Get it cut. DS2 had an undiagnosed TT that meant I couldn't bf OR bottle feed him, ended up cup/spoon feeding him for the first 11 months.
It also caused MASSIVE issues with his speech, it was incredibly delayed. Still hasn't been snipped, as will need to be fine under GA after around 12 weeks. So much better to do it sooner before the nerve endings grow in.
DS3 had his TT snipped at Kings at 10 weeks old.
Best (but hardest) decision I have ever made, for all 4 DC's!
I managed to bf him to 12mo, would have been longer but I had to start meds incompatible with bf.
I will say, MAKE them check for an upper lip tie too at the same time, and preferably get that snipped too if you can, especially if it's bad, as DS3's was missed.
DS3 cried, but bf instantly, I could feel the difference instantly, and no tears or pain for him after that bf. I think the tears were more shock at someone putting something cold and metal in his mouth, rather than actual pain tbh.
It really was the best thing I have done!
And the upper lip tie thing - DS3's was missed, but did still cause issues with bottles and beakers, he struggled to drink from them, and it caused issues with his speech, but I hadn't realised until he fell, hit his lip, and split his upper lip tie himself about 1-2 weeks ago (he's 19 months now). He said words before then, but they were very unclear. Since he split the upper lip tie, his speech has exploded, AND it's much clearer and more understandable.
I would advise DO IT!