Lip Tie in Babies: What It Is, the Controversy, and What the NHS Says

If you have been searching online for the cause of your baby's feeding difficulties, you have almost certainly encountered lip tie. It has become one of the most discussed — and most controversial — topics in infant feeding circles. Understanding what lip tie actually is, what the evidence supports, and what it does not, will help you navigate the considerable noise around this subject.

What Is a Lip Tie?

The superior labial frenulum is the small band of tissue connecting the inner surface of the upper lip to the gum above the top front teeth. A lip tie refers to a frenulum that is particularly thick, wide, or tightly attached, restricting the upper lip's ability to flange (curl outward) during breastfeeding.

Every person has a labial frenulum. A lip tie is a description of one end of a spectrum of normal anatomy, not a discrete binary condition. The debate is largely about where on that spectrum a frenulum becomes clinically significant.

Does Lip Tie Cause Feeding Problems?

This is where the controversy lies, and it is significant.

The case for treatment: Proponents argue that a tightly restricted upper lip cannot flange adequately during breastfeeding, leading to a shallow latch, nipple pain, increased air intake, and poor milk transfer. They suggest that revision (dividing the frenulum) improves latch and reduces these symptoms.

What the evidence actually shows: The evidence for lip tie as an independent cause of breastfeeding difficulties is weak. A 2020 systematic review published in the journal Pediatrics found that the evidence for labial frenulum revision improving breastfeeding outcomes was of low quality and that most studies lacked control groups. The review concluded that the diagnosis and management of lip tie lacked standardisation and that the procedure was being performed without a clear evidence base in many cases.

NHS guidance and mainstream paediatric organisations (including the RCPCH) do not include lip tie revision as a recommended treatment for feeding difficulties. The NHS does not generally offer lip tie division as a routine procedure.

Why Has Lip Tie Become So Common a Diagnosis?

Several factors have contributed to what some researchers describe as overdiagnosis:

• The lack of a clear, agreed diagnostic threshold means that clinicians vary widely in what they label as a lip tie
• Social media communities, particularly breastfeeding support groups, have amplified awareness of the diagnosis — sometimes leading parents to seek a specific diagnosis for their baby's symptoms
• Private practitioners offering laser revision have a financial incentive to diagnose and treat
• Tongue tie (which has a stronger evidence base) and lip tie are often discussed together, and the evidence for one is sometimes incorrectly applied to the other

This is not to dismiss the experiences of parents who have had a procedure and noticed improvement. Feeding is complex, and it is difficult to separate the effect of a procedure from the concurrent lactation support, positional adjustments, and parental confidence that often accompany it.

What the NHS Evidence Says

NICE does not have specific guidance on lip tie. NICE guidance on tongue tie (IPG149) focuses on the lingual frenulum and does not extend to the labial frenulum.

The NHS does not typically fund or recommend labial frenulotomy for feeding difficulties. Some NHS speech and language therapists do assess and occasionally refer for labial frenulotomy where there is evidence of a speech impact in older children, but this is distinct from the infant feeding context.

When Should You Seek an Assessment?

If your baby is having feeding difficulties — whether breastfed or bottle-fed — a thorough assessment by a qualified infant feeding specialist or lactation consultant (IBCLC) is the right first step, regardless of whether you think lip tie may be involved. A good assessment will:

• Observe a full feed
• Assess latch, positioning, and milk transfer
• Examine the mouth, including tongue mobility, palate shape, and frenula
• Consider all possible contributing factors

Many feeding difficulties attributed to lip tie resolve with skilled lactation support, positional adjustments, and time.

If a frenulum is identified during this assessment and the specialist believes it is contributing to the specific problems observed, they may suggest referral for further evaluation. At that point, a balanced discussion about the evidence and the available options is appropriate.

If You Are Considering Private Laser Revision

If you are seriously considering private labial frenulotomy, ask yourself and the practitioner the following questions:

• What specific functional problem is this intended to correct?
• What are the risks of the procedure?
• What is the evidence that this specific finding is causing this specific problem?
• What will post-operative care and lactation support look like?
• What happens if there is no improvement?

Laser lip tie revision is not without risks — there are reports of scarring, pain, and no functional improvement. Parents deserve a frank, evidence-based consultation before proceeding, rather than a quick diagnosis and treatment recommendation.

The Bottom Line

Lip tie is a real anatomical variation. Whether it routinely causes significant breastfeeding problems is genuinely uncertain. The evidence for routine revision is weak, and the NHS does not recommend or fund it for infant feeding difficulties. If your baby is struggling to feed, start with skilled lactation support. Anatomy is only one piece of a complex picture.