What tongue tie is

The NHS defines it as "where the piece of skin connecting the tongue to the bottom of the mouth is shorter or tighter than usual". La Leche League GB explains the developmental background: the frenulum normally thins and recedes before birth, and where that does not happen it may restrict tongue mobility. It often runs in families and is thought to be more common in boys. There is an association with high or unusual palates, because restricted tongue movement can affect palate shape.

The important framing, from the NHS: "Treatment is not usually needed if tongue-tie is not causing any problems." Tongue tie is diagnosed by what it does, not by what it looks like.

How it affects feeding

A baby needs to extend the tongue over the lower gum with the mouth open wide to breastfeed effectively. La Leche League GB lists what happens when that is restricted:

Being unable to latch at all, or unable to latch deeply — which causes nipple pain and damage
Difficulty staying on the breast, with a clicking sound as suction is lost
Spluttering and choking with fast flow, or fussing when flow slows
Breastfeeding constantly to get enough milk
Poor weight gain, or needing supplementation to gain adequately
Jaundice that needs treating

For the feeding parent, the classic sign is a nipple that comes out compressed or distorted into a wedge shape "like that of a new lipstick" immediately after a feed, often with a stripe at its tip. Engorgement, blocked ducts, mastitis and low milk production can all follow from ineffective milk removal. The NHS lists sore nipples and painful, swollen breasts among maternal symptoms, and trouble latching, prolonged feeds, excessive drooling, coughing or choking, reduced intake and weight concerns in babies.

Positioning first

La Leche League GB is careful about attribution: "the vast majority of such breastfeeding problems can be resolved by adjusting positioning and attachment, and with good breastfeeding management", and only occasionally is tongue tie the cause. It also notes that some babies with tongue tie breastfeed well from the start, and others do once positioning and attachment are improved.

This matters practically. The symptoms of tongue tie overlap almost completely with the symptoms of shallow attachment, and shallow attachment is far more common. A skilled feeding assessment should come before a diagnosis, not after it.

Diagnosis is also genuinely difficult. La Leche League notes degrees of tongue tie vary and it can be hard to assess accurately, and that a short, tight posterior tongue tie is rarer but may be particularly hard to spot.

What division involves

NICE describes the procedure — division of ankyloglossia — as "cutting through the fold of skin using sharp, blunt-ended scissors so the baby can feed". The NHS says young babies typically have it done without anaesthetic, while older children have a general anaesthetic, and that after surgery "most babies get better quickly and are able to feed better". Babies are usually fed immediately afterwards. NICE's guidance on the procedure, originally published as IPG149 in 2005, has since been migrated to HealthTech guidance HTG95 with the recommendations unchanged.

What the trial evidence shows

This is where honest reporting matters, because tongue tie division is a growth industry and the evidence is more limited than the marketing suggests. The Cochrane review of frenotomy in newborn infants included five randomised trials and 302 infants:

Maternal nipple pain improved. Pooled analysis of three studies (212 infants) showed a reduction in pain scores after frenotomy (mean difference -0.7 on a 10-point scale, 95% CI -1.4 to -0.1). A fourth study using a 50-point scale also showed reduction.
Infant feeding did not consistently improve. Pooled analysis of two studies (155 infants) showed no change on a 10-point feeding scale (MD -0.1, 95% CI -0.6 to 0.5). A third study of 58 infants did show improvement on a 12-point scale.
No serious complications were reported in any study, but the total number of infants studied was small.
No study was able to report whether frenotomy led to long-term successful breastfeeding.
Methodological quality was a real problem: small samples, incomplete blinding, and all studies offered frenotomy to controls — with most controls undergoing it — which the reviewers said suggests a lack of equipoise.

The reviewers' conclusion: "Frenotomy reduced breastfeeding mothers' nipple pain in the short term. Investigators did not find a consistent positive effect on infant breastfeeding." Quality of evidence was rated very low to moderate.

The reasonable reading is that division is a low-risk procedure with a real but modest and short-term benefit for pain, and an unproven benefit for feeding. It is worth considering when a skilled assessment has identified restricted tongue movement and feeding problems persist after positioning has been optimised. It is not a first-line fix for painful feeding.

Where to get assessed

In the UK, assessment is usually through your midwife, health visitor, an infant feeding team or a specialist tongue tie practitioner, often via NHS referral. In Ireland, ask your public health nurse or lactation nurse. Wherever you are, the assessment should include watching a full feed, not just looking in your baby's mouth. Be cautious of any service that diagnoses and divides in the same short appointment without observing feeding.

When to get help

Contact your midwife, health visitor, public health nurse or GP if:

Feeding hurts at every feed despite positioning being checked, or your nipples are cracked, bleeding or coming out wedge-shaped.
Your baby cannot stay attached, clicks repeatedly, or feeds almost continuously.
Your baby is not producing the expected wet and dirty nappies, or is not gaining weight.
Your baby develops jaundice that is worsening, or is very sleepy and hard to feed — seek advice the same day.

Where to get real help

Most breastfeeding problems are solved faster by someone watching a feed than by reading about them. In the UK the National Breastfeeding Helpline is 0300 100 0212 and, as its operators the Breastfeeding Network and the Association of Breastfeeding Mothers state, it is open "24 hours a day, 365 days a year", with support also available in Welsh, Polish, Bengali and Sylheti (nationalbreastfeedinghelpline.org.uk). La Leche League GB runs local groups and a helpline; in Ireland the HSE offers an "Ask our breastfeeding expert" live chat and email service. An IBCLC is an International Board Certified Lactation Consultant, the only internationally accredited lactation qualification — you can check credentials through IBLCE. Your midwife, health visitor or public health nurse can also refer you.

Tongue Tie and Breastfeeding