My eldest daughter had a tongue tie, not spotted until 3 1/2 and was related to developing a lisp. Never any problems with feeding as a baby. At kings they explained that there are three levels of tongue tie and not all benefit from surgery. My daughter did have surgery and her mouth was scarred internally as a result. She ended up having 6 more operations and then a final operation to have two salivary glands removed as the scarring from the tongue tie op meant they could no longer drain. They would get so blocked they would swell and prevent her from eating and affected speech more than tongue tie ever did! Years of speech therapy, lots of time off school and years of discomfort for her. This maybe an isolated experience but be cautious.