What Causes Tongue Tie in Babies? A Parent's Guide

May 25, 2026 · 13 min read

If your newborn is struggling to latch, making clicking sounds during feeds, or showing a heart-shaped tongue when crying, you may be wondering what causes tongue tie in babies and whether anything you did during pregnancy contributed to it. The short answer brings relief to most parents: tongue tie is a congenital developmental condition, not something caused by parenting choices. Understanding the true origins helps families make informed decisions about diagnosis, feeding support, and treatment.

TL;DR — The Bottom Line

Tongue tie (ankyloglossia) is a congenital condition caused by the lingual frenulum — the tissue under the tongue — failing to thin, recede, or migrate during fetal development. Research strongly suggests a genetic and hereditary component, possibly X-linked, meaning it often runs in families. Nothing a mother did during pregnancy causes tongue tie. Early evaluation by a tongue-tie specialist can resolve feeding, speech, and oral development issues.

Ankyloglossia (Tongue Tie): A congenital condition in which an unusually short, thick, or tight lingual frenulum restricts the movement of the tongue, sometimes affecting breastfeeding, speech, swallowing, and oral development.

Quick Facts

Medical Name: Ankyloglossia
Prevalence: Affects an estimated 4–11% of newborns
Origin: Congenital — present at birth
Primary Cause: Failure of the lingual frenulum to recede during fetal development
Genetic Link: Frequently runs in families; possible X-linked inheritance pattern
Gender Skew: More commonly diagnosed in boys than girls
Maternal Behavior: No evidence pregnancy behaviors cause tongue tie

What Is Tongue Tie and Why It Matters

Tongue tie, medically known as ankyloglossia, occurs when the lingual frenulum — the small band of tissue connecting the underside of the tongue to the floor of the mouth — is unusually short, thick, tight, or attached too far forward. This restriction limits the tongue's range of motion, which is critical for breastfeeding, bottle-feeding, swallowing, oral hygiene, jaw development, and later, speech articulation.

Before exploring what causes tongue tie in babies, it's important to recognize the signs. In infants, tongue tie often presents as poor latch, prolonged or painful breastfeeding sessions, clicking sounds during feeds, gassiness, slow weight gain, and visible notching or a heart shape at the tongue tip when extended. Mothers may experience cracked, bruised, or bleeding nipples, blocked ducts, or low milk supply due to inefficient milk transfer.

Because the tongue plays a foundational role in oral function across the lifespan, untreated tongue tie can persist into childhood and adulthood, contributing to speech challenges, picky eating, sleep-disordered breathing, and dental crowding. At Lakeland Tongue Tie, we evaluate patients from infancy through adulthood for these very reasons.

What Causes Tongue Tie in Babies? The Developmental Story

To understand what causes tongue tie in babies, we have to look at how the tongue forms in utero. Around the fourth week of fetal development, the tongue begins to emerge from the floor of the mouth. As the fetus grows, a band of tissue — the lingual frenulum — initially anchors the tongue firmly to the floor of the mouth.

In typical development, this tissue undergoes a process of apoptosis (programmed cell death) and migration. Cells in the frenulum gradually thin, recede toward the base of the tongue, or partially dissolve, allowing the tongue to gain free range of motion well before birth. By the time a baby is delivered, the tongue should be able to extend past the lower gum line, lift to the palate, and lateralize side-to-side.

In babies with ankyloglossia, this developmental process is incomplete. The frenulum either fails to recede, remains too thick or fibrous, or stays attached too close to the tip of the tongue. According to the Mayo Clinic and Children's Hospital of Philadelphia, this failure of separation before birth is the core mechanism behind every classification of tongue tie — from anterior (visible at the tongue tip) to posterior (submucosal, hidden beneath the surface).

Diagram showing fetal tongue development and how the lingual frenulum forms in babies with tongue tie — The lingual frenulum normally recedes during fetal development; when this process is incomplete, tongue tie results.

The Genetic and Hereditary Factors Behind Tongue Tie

Genetics is currently the strongest known contributor when researchers examine what causes tongue tie in babies. Multiple peer-reviewed studies and major institutions — including the Cleveland Clinic and Mayo Clinic — have observed that tongue tie clusters in families. If a parent, sibling, or close relative had a tongue or lip tie, the likelihood of a newborn presenting with one rises significantly.

The X-Linked Inheritance Theory

Research published in journals such as the American Journal of Medical Genetics has suggested that some forms of ankyloglossia may follow an X-linked inheritance pattern, meaning the gene variant is carried on the X chromosome. This may help explain why tongue tie is diagnosed approximately 2 to 3 times more often in boys than in girls, since males inherit only one X chromosome and lack a second X to potentially mask the trait.

Associated Genetic Conditions

While the vast majority of tongue ties are isolated (no other birth differences), tongue tie does appear at higher rates in certain rare genetic syndromes, including:

X-linked cleft palate syndrome
Van der Woude syndrome
Kindler syndrome
Opitz syndrome

These associations are uncommon, but they reinforce the genetic underpinnings of frenulum development.

Q: If tongue tie runs in my family, will my baby definitely have it?
Not necessarily. A family history increases the probability, but inheritance is not absolute. Many babies of parents with tongue tie are born without it, and many tongue-tied babies have no known family history. A clinical evaluation after birth is the only reliable way to confirm.

What Does NOT Cause Tongue Tie in Babies

One of the most important parts of any honest discussion about what causes tongue tie in babies is dispelling the guilt and misinformation many new mothers carry. There is no scientific evidence linking tongue tie to:

Diet, caffeine, or food choices during pregnancy
Stress or emotional well-being during pregnancy
Folic acid intake or prenatal vitamin use
Mode of delivery (vaginal birth versus C-section)
Sleeping positions during pregnancy
Exercise levels or physical activity
Use of common over-the-counter medications under medical guidance

Tongue tie develops in the first trimester, often before many women even realize they are pregnant. The condition reflects a variation in tissue migration, not a consequence of maternal behavior.

Myth: Mothers cause tongue tie by what they eat, drink, or do during pregnancy.

Reality: Tongue tie is a congenital developmental variation linked to genetics and fetal tissue remodeling. According to the Mayo Clinic and Cleveland Clinic, no parenting behavior during pregnancy has been shown to cause ankyloglossia.

Newborn baby being evaluated for tongue tie symptoms including heart-shaped tongue and feeding difficulty — A heart-shaped or notched tongue tip is a classic visual sign of anterior tongue tie in newborns.

Risk Factors That May Increase the Likelihood

Beyond genetics, researchers have identified several non-causative risk factors associated with tongue tie. These don't cause the condition but are correlated with higher rates of diagnosis when investigating what causes tongue tie in babies:

Male Gender

Boys are diagnosed with tongue tie roughly twice as often as girls, consistent with X-linked inheritance hypotheses.

Family History of Tongue or Lip Tie

A direct family history — particularly in mothers, fathers, or older siblings — is one of the strongest predictors. Many parents only discover their own tongue tie when their baby is diagnosed.

Co-Occurring Lip Tie

Tongue tie frequently coexists with an upper lip tie (a tight maxillary labial frenulum). When one is present, clinicians evaluate carefully for the other. Learn more on our services page.

Folate Metabolism Variants (Emerging Research)

Some emerging research has explored whether MTHFR gene variants — which affect how the body processes folate — may correlate with midline tissue differences, including tongue tie. This remains an active area of investigation and is not considered a confirmed cause.

Classifications of Tongue Tie and Why the Type Matters

Tongue ties are not all the same, and their classification influences how clinicians explain what causes tongue tie in babies and how it's treated. The widely used Coryllos and Kotlow classifications describe four primary types based on where the frenulum attaches:

Class	Attachment Location	Visibility
Class I	Tip of tongue	Highly visible (anterior)
Class II	Just behind the tip	Visible (anterior)
Class III	Mid-tongue	Less visible
Class IV	Base of tongue (submucosal)	Hidden — posterior tie

All four types share the same developmental origin: incomplete recession of the frenulum during gestation. Posterior ties (Class IV) are often missed in routine newborn exams because they're not visible without lifting the tongue properly — one reason families seek specialized evaluation.

How Tongue Tie Affects Babies Beyond Feeding

Understanding what causes tongue tie in babies is only half the picture; understanding its downstream effects helps families decide whether to pursue treatment. While breastfeeding difficulties are the most common immediate concern, untreated tongue tie can contribute to:

Speech development issues — particularly with sounds requiring tongue elevation (t, d, l, r, s, z)
Dental and orthodontic concerns — high narrow palate, dental crowding, malocclusion
Airway and sleep issues — mouth breathing, snoring, and increased risk of sleep-disordered breathing
Eating challenges — difficulty managing solid foods, gagging, picky eating
Oral hygiene complications — inability to sweep teeth with the tongue increases cavity risk

This is why we evaluate patients across all age groups. A toddler with persistent feeding aversion, a school-age child with articulation delays, or an adult with chronic jaw tension may all benefit from a comprehensive tongue function assessment.

Q: Can tongue tie resolve on its own as the baby grows?
Mild cases occasionally appear to improve as the mouth grows and the frenulum stretches with normal activity. However, restricted tongue function rarely fully self-corrects, and feeding, speech, or dental consequences may emerge later. A specialist evaluation is the safest way to determine whether monitoring or treatment is appropriate.

When and How Tongue Tie Is Diagnosed

Diagnosis ideally happens shortly after birth, but many babies — especially those with posterior tongue tie — go undiagnosed for weeks or months. A thorough assessment includes:

Visual examination of the frenulum's appearance and attachment point
Functional assessment of tongue elevation, extension, and lateralization
Feeding observation by a lactation consultant or trained clinician
Maternal symptom review (pain, nipple trauma, milk supply concerns)
Use of standardized tools like the Hazelbaker Assessment Tool for Lingual Frenulum Function (HATLFF)

If you're noticing feeding difficulties, you can schedule a consultation through our contact page to determine whether your baby is a candidate for treatment.

Treatment Options: From Monitoring to Laser Frenectomy

Once a tongue tie is identified, treatment depends on severity and functional impact. Options include:

Conservative Monitoring

Mild ties without functional impact may simply be monitored, especially when feeding is going well and weight gain is appropriate.

Bodywork and Therapy

Craniosacral therapy, chiropractic care, and oral motor exercises can complement treatment by addressing tension patterns associated with restricted tongue function.

Frenotomy (Simple Release)

For thin, anterior ties in newborns, a quick scissor-based release can be effective and is often performed in-office with minimal discomfort.

Laser Frenectomy

For thicker, posterior, or complex ties, a CO₂ laser frenectomy offers precise tissue release with minimal bleeding, reduced healing time, and excellent visibility. The procedure typically takes just minutes and is well-tolerated even by newborns.

Post-procedure aftercare — including stretching exercises and bodywork — is essential to prevent reattachment and optimize outcomes.

"Tongue tie is not caused by anything a parent did during pregnancy — it's a variation in how tissue forms before birth, and it's both common and treatable."

Frequently Asked Questions

What causes tongue tie in babies during pregnancy?

Tongue tie develops when the lingual frenulum fails to properly recede or thin during fetal tongue development. The exact trigger is largely genetic, with research suggesting hereditary and possibly X-linked inheritance patterns. No maternal behavior during pregnancy has been shown to cause it.

Is tongue tie hereditary?

Yes, tongue tie frequently runs in families. If a parent or sibling had a tongue or lip tie, the likelihood increases. Researchers have identified a possible X-linked inheritance pattern, which may explain why boys are diagnosed more often than girls.

Can tongue tie cause speech problems later in life?

It can. Untreated tongue tie may contribute to difficulty articulating sounds that require tongue elevation, such as t, d, l, r, s, and z. Not every child with tongue tie develops speech issues, but functional limitations should be evaluated by a specialist.

At what age should tongue tie be treated?

Tongue tie can be safely treated at any age, from newborns to adults. Early treatment in infancy often resolves breastfeeding issues quickly, but children and adults also benefit from release procedures when function is restricted. The right timing depends on symptoms and quality-of-life impact.

Does tongue tie always need to be treated?

No. Mild tongue ties that don't interfere with feeding, speech, or oral function may simply be monitored. Treatment is recommended when there's clear functional impact — such as poor latch, painful breastfeeding, speech delays, or dental and airway concerns.

Conclusion: Knowledge Is the First Step to Relief

For families struggling with feeding issues or worried about their baby's oral development, understanding what causes tongue tie in babies brings clarity and peace of mind. Tongue tie is a congenital, genetically influenced developmental variation — not the result of anything a mother did or didn't do during pregnancy. With proper evaluation and modern treatment options like laser frenectomy, families can resolve feeding challenges, support healthy speech and dental development, and give their child the best possible foundation for lifelong oral function.

If you suspect your infant, child, or even you as an adult are dealing with the effects of a tongue tie, the team at Lakeland Tongue Tie offers specialized evaluation and laser treatment in Central Florida. Schedule a consultation today to learn whether a tongue-tie release could make a meaningful difference for your family.