Tongue tie—medically known as ankyloglossia—is a condition where the strip of tissue connecting your baby's tongue to the floor of their mouth (the lingual frenulum) is shorter, thicker, or tighter than typical. This can restrict the tongue's range of motion and, in some babies, cause real problems with breastfeeding.
As a pediatrician who evaluates and treats tongue ties regularly, I see a lot of confusion around this topic. It's both over-diagnosed in some settings and under-diagnosed in others. Here's what you need to know.
How Common Is Tongue Tie?
Tongue tie affects roughly 4–11% of newborns, depending on the diagnostic criteria used. It runs in families and is more common in boys than girls.
Not all tongue ties cause problems. Some babies have a visible frenulum restriction but breastfeed beautifully. Others have a subtle restriction that causes significant difficulty. The tie itself isn't the issue—the functional impact is what matters.
Types of Tongue Tie
Tongue ties are sometimes classified by type:
Anterior tongue tie (Type 1 and 2): The frenulum attaches at or near the tip of the tongue. These are the most visible—you can often see the tongue form a heart shape when baby cries. They're easier to identify and diagnose.
Posterior tongue tie (Type 3 and 4): The frenulum attaches further back under the tongue. These are harder to see and may be hidden under the mucous membrane. They can be just as functionally significant as anterior ties but are more controversial because they require hands-on evaluation to identify.
The classification system is less important than the functional assessment—can the baby's tongue move well enough to breastfeed effectively?
How Tongue Tie Affects Breastfeeding
For a good latch, a baby needs to:
- Open their mouth wide
- Extend their tongue over the lower gum
- Create a seal around the breast
- Use a wave-like tongue motion to extract milk
A significant tongue tie can interfere with any or all of these movements. The result:
For baby:
- Difficulty latching or staying latched
- Clicking sounds during feeding (breaking and re-establishing seal)
- Sliding off the breast frequently
- Excessive gassiness (from swallowing air through a poor seal)
- Slow weight gain despite frequent feeding
- Feeding fatigue—falling asleep at the breast before getting enough
For mom:
- Painful breastfeeding (the restricted tongue compresses the nipple instead of cupping it)
- Cracked, blistered, or misshapen nipples (lipstick-shaped after feeding)
- Incomplete breast drainage leading to clogged ducts or mastitis
- Supply concerns (if milk isn't being removed efficiently, supply drops)
How Tongue Tie Is Diagnosed
Diagnosis should be based on both anatomy AND function:
Anatomical assessment: I look at the frenulum itself—where it attaches, how thick it is, and how it restricts tongue movement. I check whether the tongue can lift to the palate, extend past the lower lip, and move side to side.
Functional assessment: I observe a full breastfeeding session. How does baby latch? Do they maintain the seal? Is there clicking? How does mom describe the pain? I also evaluate baby's suck pattern with a gloved finger.
A tongue tie that looks dramatic but doesn't affect function may not need treatment. A tie that's barely visible but clearly impairs feeding may benefit from intervention. Function drives the decision, not appearance.
What If My Baby Has a Tongue Tie?
If I diagnose a functionally significant tongue tie, we discuss three options:
1. Conservative Management
Sometimes improving positioning, latch technique, and working with a lactation consultant can compensate for a mild restriction. This is appropriate when the tie causes some difficulty but not significant pain or weight gain issues.
2. Frenotomy
A quick procedure where the frenulum is released with sterile scissors or laser. For young babies (under 3–4 months), this is typically done in the office with minimal discomfort and immediate improvement in many cases.
3. Observation
If baby is gaining weight well and mom isn't in pain, sometimes the best approach is to monitor. Some restrictions become less impactful as baby grows and develops better oral muscle control.
The Controversy
Tongue tie diagnosis and treatment has exploded in the last decade. This is partly because we're better at recognizing it—but it has also led to overdiagnosis and unnecessary procedures in some cases.
My approach: I treat tongue tie when there is a clear functional problem that's affecting feeding. I don't release ties that aren't causing issues, and I don't diagnose ties based on anatomy alone. A thorough evaluation—watching a feeding, assessing symptoms, checking oral function—is essential before recommending any procedure.
Questions to Ask Your Provider
If someone suggests your baby has a tongue tie, here are good questions:
- What type of tie is it?
- How is it affecting my baby's feeding function specifically?
- Have you observed a breastfeeding session?
- What's the evidence that releasing it will improve our specific symptoms?
- What are the alternatives to a procedure?
- What should I expect after a release?
A provider who takes the time to answer these questions and who bases their recommendation on functional assessment (not just visual inspection) is giving you quality care.