How Mouth Breathing Can Influence Your Child’s Growth, Facial Development, and Posture
When a pattern becomes part of how your child breathes day after day, it doesn’t just stay in the lungs — it shows up in the body.
In Part 1, we talked about what mouth breathing is and why it matters. Today, I want to explore what it can mean for your child’s growth, facial development, and posture.
Because this is where structure meets function — and where early awareness can make a real difference over time.
Breathing Impacts More Than Just Air
Our bodies are beautifully interconnected. Nose vs. mouth breathing isn’t just about air moving in and out. It influences how the tongue rests, how the jaw develops, and how the head and neck are positioned.
When the nose is doing its job, airflow is filtered, warmed, and delivered in a way that supports the entire airway. Nasal breathing also allows the tongue to rest up against the roof of the mouth — creating a natural “scaffold” for the upper jaw.
Research shows that children who habitually breathe through their mouth tend to have differences in facial growth compared with nasal breathers. These include:
Increased lower facial height
Narrower upper jaw
Changes in jaw angle
Altered airway dimensions¹
This doesn’t happen overnight. But over months and years, the body adapts — and those adaptations can influence how a child looks, feels, and functions.
What the Research Says
Several studies and reviews have examined the effects of mouth breathing on craniofacial development:
A meta‑analysis found measurable skeletal differences in mouth‑breathing children, including increased facial height and changes in jaw growth patterns.²
Other research links mouth breathing with maxillary narrowing and dental arch constriction — which, in turn, can impact bite patterns and tongue posture.³
A systematic review reported that mouth‑breathing children often show altered craniofacial morphology compared to their nasal‑breathing peers.⁴
This isn’t about “looks.” It’s about how the underlying structure develops — because structure influences function, and function influences confidence, comfort, and daily ability.
Why Posture Often Changes Too
You may have noticed clinically that many kids who breathe primarily through their mouths tend to hold their heads forward. This forward head posture isn’t random.
When the airway feels restricted, the body naturally shifts to keep air moving. A slight forward head position can help open the airway momentarily — but over time, that position becomes habitual.
Forward head posture often comes with:
Rounded shoulders
Tension in the neck and upper back
Compensatory jaw positioning
Lowered tongue posture
And that can create a cycle where the body adapts to the breathing pattern, rather than supporting natural alignment.
A growing body of research has observed correlations between mouth breathing and changes in head and cervical spine posture in children.⁵
What This Looks Like in Everyday Life
Everyone’s body is unique — but here are patterns families often notice over time:
Facial Features: Many parents describe their child’s face as “longer” or “less symmetrical” compared with siblings or peers.
Resting Mouth Posture: Lips are often parted, and the tongue rests low instead of against the palate.
Chewing and Swallowing Patterns: Children may chew slowly, seem easily tired during meals, or swallow with a forward tongue posture.
Neck and Shoulder Tension: Kids may hold their head forward even when sitting or playing.
These aren’t “bad” traits — they are adaptations. But understanding the why helps us support healthier patterns moving forward.
What Parents Can Do
If your child shows signs of habitual mouth breathing, here are gentle, nurturing steps you can take:
Notice Patterns First: Notice how your child breathes during calm moments — at rest, during quiet play, or right before sleep.
Support Nasal Breathing: When appropriate (and with pediatric guidance), encourage nose breathing with gentle reminders — not force.
Support Posture: Simple movement activities that support core and postural alignment can help the body feel more organized overall.
Listen Together: Ask your pediatrician if a referral to an ENT, allergist, or dentist could help rule out structural causes like enlarged tonsils/adenoids or nasal obstruction.
Seek Functional Support: If habits persist, a team approach including pediatric OMT - that’s Me!! (orofacial myofunctional therapy) can help retrain breathing, tongue posture, and related motor patterns in a developmentally appropriate way.
A Note of Reassurance
These patterns don’t mean something is “wrong.” Our bodies adapt in response to what they experience. Mouth breathing — especially when present over time — is a signal that something in the system might benefit from support.
When we pay attention gently and early, we give children the gift of building healthier patterns with ease, rather than having to undo long‑standing adaptations later.
In the next post (Part 3), we’ll explore how mouth breathing and these growth patterns can influence daily function — especially feeding, speech, and sleep quality.
References
Zhao, Z. et al. (2021). Effects of mouth breathing on facial skeletal development: A meta-analysis. Orthodontics & Craniofacial Research, 24(3), 305–315.
Abreu, R.R. et al. (2008). Mouth breathing and dentofacial development: A systematic review. Journal of Oral Rehabilitation, 35(9), 718–724.
Allais, D. et al. (2015). Dental arch changes in mouth breathing children. European Journal of Paediatric Dentistry, 16(3), 201–205.
Okuro, R.T. et al. (2011). Head posture in mouth-breathing children: A systematic review. Brazilian Journal of Otorhinolaryngology, 77(5), 631–638.
Tecco, S. et al. (2018). Cervical posture and malocclusion in mouth‑breathing children. European Journal of Orthodontics, 40(2), 143–150.