Tongue tie is one of the most searched — and most contested — newborn topics. Here's what the evidence actually says, separate from the noise.
Tongue tie (ankyloglossia) is when the frenulum — the strip of tissue connecting the underside of the tongue to the floor of the mouth — is shorter, tighter, or attaches further forward than usual. About 1 in 10 babies are born with some degree of tongue tie.
The key thing to understand: tongue tie is about function, not just how the tongue looks. A posterior tongue tie — which attaches further back and is harder to see — can cause significant feeding difficulties. Assessment requires a trained practitioner to feel and observe tongue movement, not just look at it.
Many babies with tongue tie breastfeed perfectly well. Whether it causes problems depends on its severity and position — and more importantly, on whether feeding is actually being affected.
Signs it may be interfering with breastfeeding include: poor latch that doesn't improve with positioning support, nipple pain, a clicking sound during feeding, milk leaking from the corners of the mouth, or a baby who feeds frequently without seeming satisfied. Most breastfeeding problems can be resolved with positioning support alone.
Tongue tie assessment and division are available on the NHS, but access varies significantly by area. In some regions midwives can refer directly. In others you need a GP referral, and GP awareness of tongue tie varies.
The clearest path: ask your midwife or health visitor for a feeding assessment first — not just a referral. A feeding assessment will confirm whether tongue tie is the likely cause or whether positioning support would help more.
The division procedure (frenotomy) involves cutting the frenulum with sterile scissors. In babies under around 6 months it is done without anaesthetic — it takes seconds, and most babies cry briefly then feed.
Improvement in feeding doesn't always happen immediately. Many babies need time to learn new tongue movement patterns — sometimes days, sometimes weeks. Feeding support after division significantly improves outcomes. Division without follow-up support is less effective.
Most children with tongue tie develop normal speech. Some may have difficulty with specific sounds but speech difficulties from tongue tie are generally only apparent by around age 3 — and many improve spontaneously as the frenulum stretches with growth.
This means that making a decision about division in infancy based primarily on speech concerns is not evidence-supported. The main indication for treating tongue tie in a newborn is current feeding difficulty, not anticipated speech problems.