From Breathing to Speaking: How Mouth Breathing Influences Speech, Feeding, and Sleep in Children: Part 3
Part 3 of the Mouth Breathing Series
In the first two parts of this series, we talked about what mouth breathing is and how it can influence facial growth, jaw development, and posture.
But the question many parents eventually ask is: “How does this actually affect my child day to day?”
That’s where things like speech, eating, sleep, and even energy levels come into the picture.
Because breathing patterns don’t just stay in the airway. They influence how the mouth moves, how the body organizes itself, and how comfortably a child moves through their day.
Breathing and the Way the Mouth Moves
The mouth is responsible for a lot: breathing, eating, speaking, and swallowing.
When children primarily breathe through their nose, the tongue naturally rests on the roof of the mouth, the lips stay gently closed, and the jaw has a stable position to work from.
But when breathing shifts to the mouth, those patterns can change. The tongue often rests low in the mouth. The lips may stay slightly open. The jaw may work harder to stabilize during movement.
Over time, those changes can influence how easily children chew, swallow, and produce speech sounds.
How Mouth Breathing Can Influence Speech
Many children who habitually breathe through their mouth develop speech patterns that reflect how their tongue and jaw are functioning.
For example, when the tongue rests low instead of on the palate, it may move forward during speech. This can contribute to things like:
A frontal lisp
Tongue protrusion during speech
Distortions of sounds like s, z, sh, ch, and j
Difficulty maintaining clear articulation during longer phrases
Research has found higher rates of articulation differences and tongue thrust patterns in children who are chronic mouth breathers.¹
That doesn’t mean every mouth-breathing child will have a speech delay. But it helps explain why some children seem to plateau with articulation even when they are working hard in therapy. Sometimes the underlying breathing and resting patterns need support as well.
Eating and Chewing Can Be Affected Too
Breathing and eating share the same space in the body. When breathing patterns change, feeding patterns often adapt too.
Children who primarily breathe through their mouth may:
Take longer to chew food
Tire more easily during meals
Hold food in their cheeks
Struggle with efficient swallowing
Prefer softer foods
Part of this happens because nasal breathing helps coordinate the rhythm of breathe–chew–swallow.
If the body is relying on the mouth for breathing, it can feel harder to pause that breathing long enough to chew and swallow comfortably.
Sleep, Energy, and Regulation
One of the most significant areas affected by mouth breathing is sleep.
Even when children don’t meet criteria for full obstructive sleep apnea, chronic mouth breathing can contribute to fragmented or less restful sleep.
Sleep-disordered breathing in children has been associated with:
Restless sleep
Snoring
Night waking
Daytime fatigue
Attention and behavioral challenges²
When sleep quality is affected, everything else becomes harder—focus, emotional regulation, learning, and overall energy. Sometimes what looks like a daytime behavioral challenge is actually connected to nighttime breathing.
The Good News: Patterns Can Change
The body is incredibly adaptable. When we identify patterns early and support healthy breathing, posture, and oral function, many children can develop more efficient habits over time.
Support may involve different professionals depending on the child’s needs, including:
Pediatricians
ENT specialists
Allergists
Dentists or orthodontists
Speech-language pathologists trained in orofacial myofunctional therapy (ME!)
The goal isn’t to “fix” a child. It’s to help their body find patterns that feel easier and more efficient.
Bringing It All Together
Across this series, we’ve explored how breathing patterns can influence much more than we might expect.
Part 1: Why mouth breathing matters for sleep and overall health
Part 2: How breathing can influence facial growth, jaw development, and posture
Part 3: How those patterns can show up in everyday skills like speech, eating, and energy
For many families, the biggest takeaway is this: small patterns matter.
The way a child breathes, rests, chews, and sleeps all work together. And when we look at the whole picture, we’re often able to support children in ways that make everyday life feel easier for them.
If you’ve noticed your child frequently breathing through their mouth or struggling with sleep, chewing, or speech clarity, it can be helpful to explore it further.
Sometimes reassurance is all that’s needed. Sometimes a little support makes a big difference. Either way, you don’t have to figure it out alone.
References
Souki, B. Q., et al. (2009). Prevalence of malocclusion among mouth-breathing children. American Journal of Orthodontics and Dentofacial Orthopedics, 135(3), 318–323.
Tan, H. L., Gozal, D., et al. (2023). Pediatric obstructive sleep apnea and neurocognitive outcomes. Children (Basel), 10(2), 13.
Abreu, R. R., et al. (2008). Mouth breathing and dentofacial development: A systematic review. Journal of Oral Rehabilitation, 35(9), 718–724.