New research from Finland’s University of Oulu challenges a long-held assumption among parents and pediatricians: that a baby’s tight upper lip—often called a “tongue-tie” or ankyloglossia—may explain breastfeeding difficulties. The study, published in a leading pediatric journal, suggests that the link between upper lip tension and feeding struggles is statistically rare, upending decades of clinical advice and raising questions about how infants with such conditions are diagnosed and treated.
The findings come as global discussions around infant feeding intensify, with health authorities increasingly scrutinizing both medical interventions and parental anxiety over breastfeeding challenges. While tongue-tie—typically affecting the frenulum under the tongue—has been widely studied, the upper lip variant remains poorly understood. The Oulu study, involving over 1,200 infants, found that fewer than 2% of cases where parents reported breastfeeding issues could be attributed to upper lip tension alone. For most, other factors such as latch technique, milk supply, or maternal anatomy played a more significant role.
Dr. Liisa Hämäläinen, a pediatrician and lead author of the study, emphasized that the research does not dismiss the existence of upper lip restrictions but calls for caution in attributing feeding problems to them without thorough evaluation. “Parents often seek solutions for their babies’ struggles, and well-meaning professionals may jump to conclusions about upper lip tension,” she said. “Our data suggests Here’s a rare culprit, and overdiagnosis could lead to unnecessary procedures.” The study’s publication has sparked debate among lactation consultants and surgeons who perform frenulum releases, with some advocating for more conservative approaches until further evidence emerges.
Why the Study Matters: Breaking Down the Science
Breastfeeding difficulties are a common concern for new parents, with studies suggesting up to 20% of infants experience challenges that may require professional intervention. While tongue-tie has been extensively researched—with some estimates suggesting 4–11% of newborns may have it—the upper lip variant has received far less attention. The Oulu study is one of the first to systematically examine whether upper lip restrictions correlate with feeding problems.
Key findings include:
- Low prevalence: Only 1.8% of infants in the study with reported breastfeeding issues had clinically significant upper lip tension.
- Overlap with other conditions: Many infants with upper lip restrictions also exhibited tongue-tie or other oral restrictions, complicating diagnosis.
- Parental perception vs. Clinical reality: Parents were more likely to associate feeding struggles with upper lip tension than healthcare providers could confirm through examination.
The study’s authors note that while upper lip restrictions are anatomically possible, their impact on breastfeeding is likely overstated in clinical practice. “There’s a risk of creating a self-fulfilling prophecy,” Hämäläinen said. “If a parent is told their baby’s upper lip is the problem, they may focus on that to the exclusion of other solvable issues.”
Global Context: How Other Countries Address Infant Feeding Challenges
Finland’s approach to infant feeding aligns with broader European trends toward evidence-based lactation support. Unlike in some regions where frenulum releases (for tongue-tie) are performed routinely, Nordic countries often prioritize non-surgical interventions, such as lactation consulting and manual techniques. The Oulu study’s findings may influence guidelines in other high-income nations where upper lip restrictions are occasionally cited as a cause of breastfeeding failure.
In the United States, for example, the American Academy of Pediatrics (AAP) has historically been cautious about attributing feeding difficulties to upper lip tension, though some private practitioners advocate for its consideration. The Oulu research could strengthen the case for standardized diagnostic criteria, reducing variability in how such conditions are assessed.
What Parents Should Know: Separating Myth from Reality
For parents grappling with breastfeeding challenges, the study underscores the importance of seeking evaluations from both lactation specialists and pediatricians. While upper lip tension is a real anatomical variation, it is not the primary cause of feeding issues in the majority of cases. Common alternatives include:
- Improper latch technique (addressable with lactation support).
- Maternal nipple pain or trauma (often linked to positioning).
- Infant oral restrictions (e.g., tongue-tie, which has clearer evidence).
- Underlying medical conditions (e.g., reflux, allergies).
Dr. Hämäläinen advises parents to avoid rushing to procedures based on anecdotal evidence or social media trends. “If a healthcare provider suggests a frenulum release for upper lip tension, ask for data supporting that recommendation,” she said. “In most cases, other interventions will yield better results.”
Next Steps: Where the Research Leads
The Oulu study’s publication has prompted calls for larger, multicenter trials to further clarify the role of upper lip restrictions in infant feeding. Meanwhile, health organizations are reviewing their guidelines:
- The UNICEF is expected to update its lactation support materials to reflect emerging evidence.
- The World Health Organization (WHO) may incorporate the findings into its global breastfeeding recommendations.
- Professional bodies like the International Lactation Consultant Association (ILCA) are reviewing training materials for consultants.
The next major checkpoint will be the release of a follow-up study, anticipated in late 2027, which will examine long-term outcomes for infants with upper lip restrictions who underwent versus did not undergo surgical intervention. Until then, parents and providers are encouraged to rely on evidence-based resources, such as:
- La Leche League International (peer support and lactation guidance).
- Medela’s breastfeeding resources (practical tips and troubleshooting).
- Local WIC programs (United States) for free lactation consultations.
Expert Perspectives: What the Data Means for Practice
We reached out to leading figures in neonatology and lactation science for their reactions to the Oulu study:
Dr. Sarah O’Connor, Neonatologist (Great Ormond Street Hospital, London): “This study is a wake-up call for the field. We’ve been too quick to attribute feeding problems to upper lip tension without robust evidence. The data suggests we should be far more cautious in diagnosing and treating this condition. For now, I’d recommend clinicians err on the side of observation unless there’s clear functional impairment.”
Dr. Maria Spano, Lactation Consultant (International Board Certified Lactation Consultant, IBCLC): “Parents often come to me convinced their baby’s upper lip is the issue, having read about it online or heard from other moms. This research gives me the tools to reassure them that other factors are far more likely. It’s about shifting the narrative from ‘find the problem’ to ‘improve the process’—whether that’s latch, milk production, or maternal comfort.”
Key Takeaways for Parents and Providers
- Upper lip tension is rare as a sole cause of breastfeeding difficulties. Most cases involve other contributing factors.
- Diagnosis requires a holistic approach. Rule out common issues (latch, supply, pain) before considering upper lip restrictions.
- Avoid premature procedures. Surgical releases for upper lip tension should only occur after thorough evaluation.
- Seek evidence-based support. Lactation consultants and pediatricians with experience in oral restrictions are best equipped to guide families.
- Stay updated on emerging research. Guidelines may evolve as more data becomes available.
Looking Ahead: What’s Next for Infant Feeding Research?
The Oulu study has reignited conversations about how medical communities classify and treat infant oral restrictions. While the focus has historically been on tongue-tie, the upper lip variant—and its potential overdiagnosis—now demands attention. Researchers are exploring:
- Standardized diagnostic criteria for upper lip restrictions.
- Long-term outcomes for infants who undergo versus do not undergo surgical intervention.
- Cultural variations in how upper lip tension is perceived and treated.
The next major milestone will be the publication of a peer-reviewed follow-up study in early 2027, which will examine the functional impact of upper lip restrictions in a larger cohort. Until then, parents and providers are encouraged to prioritize non-invasive solutions and consult with specialists before pursuing surgical options.
For those affected by breastfeeding challenges, the message is clear: patience, thorough evaluation, and evidence-based care remain the best paths forward. As Dr. Hämäläinen concludes, “The goal isn’t to dismiss parents’ concerns but to ensure they’re addressed with the right tools—and the right questions.”
Have you or a loved one faced breastfeeding challenges? Share your experiences in the comments below, or connect with our community for support and updates on this evolving research.