Baby Lip Tie: Symptoms, Grades, and When Revision Is Needed
A lip tie restricts the upper lip's movement, which can affect breastfeeding latch, cause excess gas, and slow weight gain. But not every lip tie needs treatment. Here's how to tell the difference.
By TeachToddler Editorial Team · Updated April 11, 2026 · Baby Health
🔍 What Is a Lip Tie?
Every person has a frenulum — a small fold of tissue that connects the upper lip to the gum above the front teeth. In some babies, this frenulum is unusually short, thick, or tight, restricting how far the upper lip can move. This is called a lip tie (or maxillary labial frenulum restriction).
A lip tie by itself is just anatomy. It only becomes a problem when it interferes with function — specifically, the baby's ability to latch deeply during breastfeeding. Many babies have visible lip ties that cause zero issues.
📊 Lip Tie Grades (Kotlow Classification)
Lip ties are classified on a scale of 1–4 based on where the frenulum attaches to the gum. Higher grades indicate more restriction, but the grade alone doesn't determine whether treatment is needed — function matters more than appearance.
- Class 1 (mild): The frenulum attaches into the mucosa above the gum line (the soft tissue well above the teeth). This is considered a normal variant and rarely causes issues.
- Class 2 (moderate): The frenulum attaches at the junction where the gum meets the lip tissue. May or may not affect latch depending on the tissue's thickness and flexibility.
- Class 3 (significant): The frenulum attaches at the base of the gum papilla (the little triangle of gum between the front teeth). More likely to restrict upper lip flanging during breastfeeding.
- Class 4 (severe): The frenulum extends through the gum papilla and attaches to the hard palate behind the front teeth. This is the most restrictive type and most likely to impact breastfeeding. The tissue often appears thick and pale (indicating low blood supply and poor elasticity).
Key Point: A Class 4 lip tie in a baby who is breastfeeding perfectly and gaining weight well does not need revision. A Class 2 lip tie in a baby who can't latch might. The decision is always based on function, not appearance.
⚠️ Symptoms of a Problematic Lip Tie
When a lip tie is tight enough to restrict the upper lip from flanging outward (curling out like a fish lip), it can cause a cascade of feeding issues. Look for these signs:
- Shallow latch: The baby can't get enough breast tissue in their mouth because the upper lip won't flange. The latch feels like a clamp or pinch rather than a comfortable draw.
- Clicking sound during nursing: A repeated clicking or smacking noise indicates the baby is breaking suction repeatedly. This happens because the restricted lip can't maintain a proper seal.
- Excessive gas and fussiness: Breaking suction means swallowing air. This leads to a gassy, uncomfortable baby who may arch, grunt, and have difficulty settling.
- Lipstick-shaped nipple after feeding: If your nipple comes out of the baby's mouth flattened or creased like a new lipstick (angled, not round), the latch is compressing instead of drawing, often due to a lip or tongue tie.
- Painful nursing for the mother: Toe-curling pain that doesn't improve with latch adjustments. Cracked, blistered, or bleeding nipples. Nipple vasospasm (white blanching after feeds). If you've worked with a lactation consultant and pain persists, a tie evaluation is warranted.
- Slow weight gain: The baby falls off their growth curve or isn't back to birth weight by 2 weeks. Frequent feedings (more than 12 per day) with a baby who never seems satisfied can indicate inefficient milk transfer.
- Long feeding sessions: Feeds that consistently last 45+ minutes with the baby still seeming hungry may mean they're not able to extract milk efficiently.
- Milk leaking from corners of the mouth: The incomplete seal lets milk spill out during feeds.
🔗 Lip Tie and Tongue Tie: The Connection
Lip ties and tongue ties frequently occur together — roughly 50% of babies with one also have the other. This makes sense anatomically, as both structures develop from the same tissue during fetal growth.
- Tongue tie (ankyloglossia) restricts tongue movement due to a tight or short lingual frenulum under the tongue. The tongue can't extend past the lower lip, can't lift to the roof of the mouth, or can't move side to side properly.
- Tongue tie is usually more impactful on breastfeeding than lip tie alone. The tongue does most of the work in extracting milk — it cups the breast and creates a wave-like motion. A restricted tongue can't do this effectively.
- Both should be evaluated together. Fixing a lip tie while missing a tongue tie (or vice versa) often doesn't resolve the feeding problem. An IBCLC (International Board Certified Lactation Consultant) experienced with ties or a pediatric dentist should assess both.
- Posterior tongue ties are easy to miss. The frenulum is visible only when the tongue is lifted, and many pediatricians aren't trained to identify them. If feeding issues persist despite a "normal" exam, seek a second opinion from a tie specialist.
🩺 Getting a Proper Assessment
Not all providers are equally experienced with lip and tongue ties. The right evaluation matters because both over-diagnosis and under-diagnosis are common.
- IBCLC (lactation consultant): The best starting point. An experienced IBCLC will watch a full feeding, assess the latch, check the baby's oral anatomy, evaluate your nipple shape after feeding, and determine whether the tie is actually contributing to the problem or is an incidental finding.
- Pediatric dentist: Some specialize in oral restrictions and can evaluate structure and function. They're also the ones who perform laser revisions.
- ENT (ear, nose, throat doctor): Can perform surgical release using scissors if revision is needed. Good option if you prefer a surgical approach over laser.
- Your pediatrician: Many pediatricians can identify obvious ties, but mild or posterior ties are frequently missed. If your pediatrician says "it's fine" but feeding issues persist, a second opinion from a specialist is reasonable.
- Red flag providers: Be cautious of any provider who diagnoses and schedules a revision in the same appointment without watching a feed, who revises every tie they see regardless of symptoms, or who guarantees the revision will fix all feeding problems. These are signs of over-treatment.
✂️ Lip Tie Revision: What to Expect
If the assessment confirms the lip tie is causing functional problems, revision (release) may be recommended. Here's what the process involves:
- Laser frenectomy: The most common method for lip ties. A CO2 or diode laser vaporizes the tight tissue. The procedure takes 15–30 seconds. The laser seals blood vessels as it cuts, resulting in minimal bleeding. Most babies can nurse immediately after.
- Scissors release (frenotomy): An ENT or pediatrician snips the frenulum with sterile scissors. Quick and effective, with slightly more bleeding than laser. Sometimes used for tongue ties more than lip ties.
- Topical anesthetic: A numbing gel is applied to the frenulum before the procedure. Some providers also use a small injection of local anesthetic. The baby will be swaddled and may cry during the procedure but typically calms quickly afterward.
- The wound site: After revision, a white or yellow diamond-shaped patch forms where the tissue was released. This is normal healing tissue — not an infection. It looks worse on day 3–5 before improving.
- Recovery time: Most babies are fussy for 1–3 days. Over-the-counter acetaminophen (Tylenol) can help with discomfort. Many parents notice an improved latch within the first few feeds. Full healing takes 1–2 weeks.
Critical After Care: Stretching exercises after a lip tie revision are essential. Without them, the tissue can reattach. Your provider will demonstrate: lift the upper lip up toward the nose and hold for 5 seconds, sweeping side to side, every 4–6 hours for 2–3 weeks. It's uncomfortable for the baby, but skipping stretches is the most common reason revisions "fail."
🤱 Breastfeeding After Revision
Revision is not a magic fix. The physical restriction is removed, but the baby may have developed compensatory habits that need retraining.
- Work with an IBCLC before and after: A lactation consultant should help optimize latch before revision and guide the transition to improved latch afterward. The baby may need help learning to use their newly mobile lip.
- Improvement may be immediate or gradual. Some mothers feel a dramatic difference at the first post-revision feed. For others, it takes a few days to a week as the baby adapts. Both timelines are normal.
- Craniosacral therapy or bodywork: Some lactation specialists recommend gentle bodywork (craniosacral therapy or chiropractic) to release tension in the jaw, neck, and head that built up from months of compensating for the tie. Evidence is limited but many parents report improvement.
- Bottle-fed babies: Lip ties can also cause issues with bottle feeding — excessive air intake, milk dribbling, and slow feeds. Paced bottle feeding with a slow-flow nipple is recommended post-revision.
🦷 Lip Ties Beyond Breastfeeding
Even if a lip tie doesn't affect breastfeeding, parents sometimes wonder about long-term effects:
- Tooth gap (diastema): A thick frenulum that extends between the upper front teeth can contribute to a gap. However, many gaps close naturally. Pediatric dentists typically wait until at least age 7–8 (when adult teeth emerge) before recommending intervention for cosmetic spacing.
- Dental hygiene: A tight upper lip makes it harder to brush the front upper teeth. Gently lift the lip to clean underneath during tooth brushing. Food and milk can get trapped against the upper gums, increasing cavity risk.
- Speech: Lip ties alone rarely affect speech. Tongue ties are much more likely to cause articulation issues. If your child has speech concerns, a speech-language pathologist should evaluate before assuming the lip tie is the cause.
- Eating solid foods: Most lip ties don't interfere with eating solids. If a toddler struggles with certain foods, other causes (texture sensitivity, developmental readiness) are more likely than a lip tie.
🚩 When NOT to Revise
The growing awareness of lip and tongue ties has led to some over-diagnosis. A revision is not appropriate in these situations:
- The baby is breastfeeding well, gaining weight normally, and the mother isn't in pain
- The tie is visible but the feeding assessment shows normal function
- Breastfeeding problems exist but are caused by something else (poor positioning, low supply, oversupply, flat nipples) — not the tie
- The provider didn't watch a feeding before recommending revision
- The baby is exclusively bottle-feeding with no issues (though ties can still cause bottle-feeding problems in some cases)
- The revision is recommended solely for a potential future tooth gap — this is not an urgent issue and can be reassessed later