Tongue tie or ankyloglossia is a common condition in babies. But the fact is that it rarely causes any problem for the baby in feeding or speaking when they are older.
It is a problem if the baby cannot take the tip of the tongue beyond the lower incisor teeth (or where they will erupt). They only need to make a suction cup around the nipple to be able to breastfeed.
It’s important to recognise other conditions which might be causing the problem with feeding, like retracted nipples, Gastroesophageal Reflux disease, Cow’s milk protein allergy, infection etc. and treating them should resolve the issue.
If everything else is ruled out and Tongue tie is definitely significant, it can be divided (Incision of the frenulum of the tongue). NICE has produced guidelines for that (https://www.nice.org.uk/guidance/ipg149).