Does Your Baby Have a Restrictive Tongue-Tie? Signs and Next Steps

If your little one cries with a heart-shaped tongue, struggles to latch onto the breast, or you simply feel that "something isn't working" while breastfeeding, you may be looking at a restrictive frenulum. Not every frenulum causes problems, but when one does, identifying it early can make a concrete difference in your baby's first months (and in the mother's, clearly).

What the lingual frenulum is, and when it becomes a real problem

The lingual frenulum is a band of tissue connecting the underside of the tongue to the floor of the mouth. Under normal conditions it's flexible enough to allow every movement and function the tongue needs: sucking, swallowing, speaking, licking.

The problem appears when that tissue is too short, thick or rigid. That's ankyloglossia, also known as tongue-tie. The tongue is left partially tethered, with a reduced range of motion.

According to the Cochrane review on frenotomy in newborns, ankyloglossia affects between 4% and 11% of babies. The real prevalence may be higher, since mild cases often go undiagnosed.

What matters is not so much whether the frenulum "looks short," but whether it restricts function. That's why a complete, multidisciplinary functional evaluation is essential.

Tongue-tie vs. lip-tie: which is which

Two frenula are routinely evaluated in babies:

Lingual frenulum: connects the tongue to the floor of the mouth. When restrictive, it's the one that most frequently interferes with breastfeeding, limiting the elevation, extension and lateralization of the tongue, the movements a good seal and suction depend on.

Labial frenulum: connects the upper lip to the gum. This one is rarely released in babies. Unlike the lingual frenulum, its attachment migrates as the maxilla grows. It's treated in only a few cases in infancy: when it affects breastfeeding by limiting lip flanging (the "duck lips" position). In older children it can cause a gap between the upper central teeth (diastema); in those cases, surgery is considered only around age 9.

Some babies may have restriction in both, known as "tongue and lip tie." Though uncommon, the functional evaluation should consider both.

How to tell if your baby has a restrictive frenulum

The signs aren't always obvious at first glance. Some show directly in the baby's mouth; others appear during feeding or through the mother's own symptoms.

What you may notice in your baby

• The tongue doesn't lift toward the palate when crying or yawning. If you lift it gently, it should rise easily.
• The tip of the tongue looks split or heart-shaped when extended, because the frenulum pulls it down.
• The tongue doesn't reach past the gums, or barely does.
• Latching difficulty: can't open wide, loses the breast frequently, or makes an audible clicking sound while sucking.
• Very long feeds (over 40 minutes) followed by hunger cues, or extreme tiredness during feeds.
• Low weight gain without another apparent cause.

What you may notice as a mother

• Persistent pain while breastfeeding that doesn't improve with position or latch corrections.
• Deformed nipples after feeds: flattened, lipstick-shaped, or with clear compression marks.
• Recurrent mastitis or blocked ducts, which can result from inefficient milk transfer.
• The feeling that your baby is never satisfied, or needs to nurse constantly.

None of these signs alone confirms a restrictive frenulum. But if several coincide, a functional evaluation is worthwhile.

Beyond breastfeeding: the impact on development

A restrictive frenulum doesn't only affect feeding in the first months. Left unevaluated, it can have consequences later:

Speech development. The tongue is the main articulator of language. Untreated ankyloglossia can make sounds requiring tongue elevation difficult, like "r", "l", "t", "d", "n" or "s". This doesn't show immediately; it becomes evident between ages 2 and 4.

Maxillofacial development. At rest, the tongue should sit against the palate. If the frenulum prevents that, the tongue rests low, which can affect the development of the upper arch and favor mouth breathing, a high narrow palate and malocclusion.

Oral habits. Children with tongue restriction tend to develop compensatory habits: mouth breathing, tongue interposition, or tongue thrust when swallowing.

Everyday function. Licking ice cream, playing a wind instrument, clearing food with the tongue. All things a restricted tongue can't do well.

The different types of restrictive tongue-ties

Not all ankyloglossias are the same. They're usually classified by location (anterior or posterior), depth, and the degree of functional restriction.

Anterior tongue-ties are the most visible: the frenulum attaches near the tip of the tongue. They're easy to spot.

Posterior tongue-ties are harder to see because the tissue sits further back, sometimes under the mucosa. They can cause the same functional problems, and they're frequently missed in general pediatric checkups.

That's why an evaluation by a professional experienced in frenula (not just a quick visual inspection) is essential. This is performed by a speech therapist specialized in orofacial motor function and breastfeeding.

What to expect at the evaluation

At Bites Odontopediatría we have a multidisciplinary team for a complete functional evaluation. The speech therapist will generally assess:

• The tongue's real mobility: elevation, extension and lateralization.
• The quality of suction (in breastfeeding babies).
• The attachment and type of lingual and labial frenulum.
• The symptoms the parents report.

With that evaluation in hand, the criteria for deciding when to operate and when not to are discussed calmly with the family.

Acting early makes sense

The optimal time to treat a restrictive frenulum that affects breastfeeding is during the first weeks of life. The earlier function is corrected, the fewer consequences later. Also:

• The tissue is thinner in the first months, making the procedure technically simpler.
• Breastfeeding can be preserved. The immediate impact shows in better latch and maternal comfort.
• The baby keeps no memory of the procedure.

That said, a tongue-tie untreated in early infancy can still be addressed later. What changes is the goal and the context: in an older child, the indication is no longer breastfeeding but speech, occlusion or overall orofacial function.

When to seek an evaluation

If you have any doubt about your baby's frenulum (even just an intuition that something isn't quite right), come in. A functional evaluation is non-invasive and can give you clarity in minutes.

At Bites Odontopediatría in Vitacura, Santiago, we evaluate frenula from the first days of life and work together with speech therapists. If treatment is indicated, we perform the diode laser frenectomy; you can see the procedure details and book the evaluation here.