How do I know if I need to cut my baby's tongue tie?

What the evidence says

A tongue-tie, called ankyloglossia, happens when the strip of tissue under the tongue is shorter or tighter than usual. It is fairly common, affecting somewhere between 4 and 11 babies out of 100. But having a tongue-tie does not automatically mean it is causing a problem.

The Canadian Paediatric Society says that most of the time, a tongue-tie is just something doctors notice, without it causing any real trouble. They recommend cutting it, a quick procedure called a frenotomy, only when there is clear evidence it is interfering with breastfeeding or another real clinical concern, not simply because the tie is visible.

Signs worth watching for include your baby struggling to latch or staying attached, feeding for a very long time without seeming satisfied, poor weight gain, or your baby seeming hungry and fussy all the time. On your side, look out for nipple pain, cracking, or a drop in your milk supply. If bottle-feeding, tongue-tie causes fewer problems since it takes less tongue movement to get milk from a bottle.

Here is the tricky part: even among experts, there is no single agreed-upon way to measure how severe a tongue-tie is, and studies on whether cutting it actually helps are mixed. A Cochrane review and a systematic review from the American Academy of Pediatrics found some studies show improved comfort for mom and better latch scores, while others show no real difference. A 2025 review of many studies found the evidence remains inconclusive, especially for weight gain, and warned that ties may be over-diagnosed and over-treated.

So the honest answer is: do not decide based on how the tongue looks alone. Get a proper feeding assessment, ideally from a lactation consultant or your doctor, looking at latch, weight gain, and pain together. If those show a genuine problem tied to the tongue restriction, a frenotomy done by an experienced provider is a reasonable, low-risk option. If feeding is actually going well despite the visible tie, most guidelines say leave it alone.