A Guide to Understanding Your Baby’s Oral Function

A baby may have a visible lingual frenulum and feed comfortably. Another may have significant feeding difficulty with no visible anatomical explanation. That is why an A Guide to Understanding Your Baby’s Oral Function needs to begin with the whole feeding picture, rather than with appearance alone. Families deserve to be heard without assumptions, and professionals need a framework that supports careful clinical reasoning.

Oral assessment can provide valuable information, but it is only one part of understanding feeding. The central question is not simply, “Is there a tie?” It is whether oral movement and feeding function may be contributing to the concerns described, alongside the many other factors that can affect a baby’s ability to feed.

What is an infant oral function evaluation?

An infant oral function evaluation is a skilled, structured consideration of how a baby uses their mouth, tongue, jaw and lips during feeding and at rest. It brings together a feeding history, observation of a feed where possible, an assessment of oral anatomy and movement, and an understanding of the family’s priorities.

This is not a diagnosis based on a single sign. A lingual frenulum is normal anatomy, with considerable variation in its appearance and attachment. The presence of a frenulum alone does not establish that it is restrictive or that it is causing feeding problems. Current guidance and professional statements emphasise that ankyloglossia is a functional diagnosis, requiring assessment in the context of breastfeeding or other feeding concerns (Academy of Breastfeeding Medicine, 2021; American Academy of Pediatrics, 2024).

For families who bottle feed, combination feed, express milk, or use feeding methods that change over time, the same principle applies. The clinician considers the individual baby’s feeding efficiency, comfort, coordination and growth alongside the family’s experience. Breastfeeding, chestfeeding and bottle feeding are all valid feeding journeys, and each may present different practical challenges.

Why function must sit beside anatomy

“Anatomy provides information. Function provides context.” This distinction matters because visual appearance does not reliably predict feeding impact. Some babies with a prominent or tightly appearing frenulum feed effectively and comfortably. Conversely, feeding difficulty can arise from positioning, milk flow, prematurity, birth-related factors, neurological or developmental differences, nasal congestion, reflux-like symptoms, maternal nipple pain, breast fullness, bottle teat flow, or a combination of issues.

A functional assessment does not seek to attribute every concern to the mouth. It asks whether observations are consistent, whether they change with skilled feeding support, and whether there are other plausible explanations that need attention. This protects families from both dismissal and oversimplification.

Research into assessment tools reflects this complexity. Tools may support consistency in describing appearance and movement, but no tool should replace clinical judgement, observation of feeding and shared decision-making. The Academy of Breastfeeding Medicine advises that no published tool should be used as the sole basis for deciding whether a frenulotomy is indicated (Academy of Breastfeeding Medicine, 2021).

What a thoughtful evaluation considers

The family’s feeding story

An assessment usually starts with listening. Families may describe pain, frequent feeds, clicking, dribbling, unsettled feeds, prolonged bottle feeds, difficulty maintaining attachment, concerns about milk transfer or slow weight gain. These experiences are real and deserve a careful response, even when the cause is not immediately clear.

Useful context includes the baby’s age and birth history, health and growth, feeding frequency and duration, any changes since birth, previous support, and what feels most difficult for the family. It can also be helpful to understand what is going well. A baby who is gaining appropriately, feeding comfortably and whose parent feels well supported may need a very different conversation from a baby with persistent feeding difficulty and a parent in pain.

Observation of feeding

When appropriate and possible, observing a feed offers information that an oral examination cannot provide on its own. For breastfeeding, this may include the baby’s positioning, attachment, audible swallowing, milk transfer cues and the parent’s comfort. For bottle feeding, observation may consider the baby’s readiness, seal, pacing, coordination, milk loss and signs of fatigue or stress.

One feed is still a snapshot. Babies vary across the day, and milk flow, tiredness, hunger and the setting can all influence what is seen. A sensitive clinician will balance direct observation with the family’s account, rather than disregarding either.

Oral anatomy, movement and wider wellbeing

The oral examination considers structures and movement in an age-appropriate, gentle way. The aim is to understand whether the tongue appears able to move in ways that may support feeding, while recognising that a settled baby may show different movement from a hungry, crying or fatigued baby.

The wider examination and history matter too. Professionals remain alert to concerns that may warrant review by an appropriate medical practitioner, such as poor weight gain, dehydration risk, respiratory symptoms during feeds, marked feeding aversion, illness or other developmental concerns. Oral function assessment is not a substitute for comprehensive infant care.

Making sense of the findings

A good evaluation ends in interpretation, not a score or label. The clinician should explain what was observed, what remains uncertain and which factors may be interacting. Families should have space to ask questions and to say what outcome matters most to them, whether that is reducing pain, making feeds calmer, supporting milk transfer, protecting supply, or feeling more confident with bottle feeding.

Conservative feeding support may be appropriate when feeding mechanics, positioning, pacing or comfort can be improved without a procedure. This support can be valuable whether or not a restrictive frenulum is suspected. Sometimes reassessment after a period of skilled support clarifies the picture.

Where restriction of tongue function appears to be contributing to ongoing infant feeding difficulties, frenulotomy may be discussed as one possible option. Evidence from randomised trials and systematic reviews suggests that frenulotomy can reduce maternal nipple pain for selected breastfeeding dyads, but evidence for longer-term breastfeeding outcomes remains limited and heterogeneous (O’Shea et al., 2017; Francis et al., 2015). The decision should therefore be individualised, with realistic discussion of potential benefits, limitations, alternatives and aftercare.

It is equally valid for a family to choose continued conservative management, to seek another opinion, or to decide that no intervention is right for them. Informed consent is a conversation, not a signature.

Questions families and professionals can use

Whether you are attending an appointment or referring a family, it can help to ask: What feeding concerns are we trying to understand? What did the feeding observation show? Are there factors beyond oral anatomy that may be relevant? What support could be tried first or alongside further assessment? What are the expected benefits and uncertainties of each option?

For professionals, reflective practice is particularly valuable where findings are mixed. Avoiding both over-diagnosis and under-recognition requires humility, ongoing education and appropriate referral pathways. A function-focused approach does not promise a simple answer, but it creates a safer and more compassionate route towards one.

If you are a healthcare professional interested in developing your understanding of infant tongue-tie, oral function and feeding, you may be interested in my Tongue-tie School professional education programme, Fundamentals in Infant Tongue-tie Anatomy, Function and Treatment Considerations. The programme takes a function-based, evidence-informed approach, exploring the relationship between anatomy, oral function and infant feeding, alongside treatment considerations, supportive strategies, preparation, rehabilitation and ongoing care. It is designed for healthcare professionals supporting infants and families who would like to deepen their knowledge and understanding of this complex area. For more information, please visit https://www.tongue-tie.info/school

Every feeding journey deserves support that is practical, respectful and grounded in the baby and family in front of us. The most helpful next step is often not to search for a single cause, but to seek a skilled assessment that makes room for the full story.

References

Academy of Breastfeeding Medicine (2021) ‘Academy of Breastfeeding Medicine position statement on ankyloglossia in breastfeeding dyads’, Breastfeeding Medicine, 16(4), pp. 278-281.

American Academy of Pediatrics (2024) ‘Identification and management of ankyloglossia and its effect on breastfeeding in infants: Clinical report’, Pediatrics, 153(2), e2023064052.

Francis, D.O., Chinnadurai, S., Morad, A., Epstein, R.A., Kohanim, S., Krishnaswami, S., McPheeters, M. and Walsh, J. (2015) ‘Treatment of ankyloglossia and breastfeeding outcomes: A systematic review’, Pediatrics, 135(6), e1458-e1466.

O’Shea, J.E., Foster, J.P., O’Donnell, C.P.F., Breathnach, D., Jacobs, S.E., Todd, D.A. and Davis, P.G. (2017) ‘Frenotomy for tongue-tie in newborn infants’, Cochrane Database of Systematic Reviews, 3, CD011065.