Breathing is the one thing the body does automatically, continuously, and without any conscious effort. Because of this, it is easy to assume that breathing just happens, that as long as air is going in and out, the body is getting what it needs.

But how we breathe matters enormously. Not just for oxygen delivery, but for nervous system regulation, emotional state, cognitive function, oral development, sleep quality, and particularly for children, the developmental foundations that everything else depends on.

At Tailored Developmental Therapies, breathing is not an add-on to our therapeutic programs. It is integrated into everything we do, because we see, consistently, that when a child’s breathing pattern shifts, so does their capacity to regulate, to learn, and to engage. It is one of the most accessible and most underused tools available to families, and it costs nothing to start.

This post explains why belly breathing and nasal breathing matter, what happens when they are absent, and exactly how to practise them with your child in a way that is effective, gentle, and genuinely enjoyable.

Breathing exercises are a powerful home tool, but they work best as part of a broader nervous system regulation program. If your child’s regulation, behaviour, or development is a concern, our free 30-minute phone consultation is the right place to start. Book your complimentary call — available Mondays 3:30–4:30pm.

Nasal Breathing vs Mouth Breathing: Why the Difference Matters

The nose is not simply an alternative route for air. It is a sophisticated biological system designed to prepare air for the lungs in ways the mouth cannot replicate.

When we breathe through the nose, the air is warmed to body temperature, humidified, and filtered before it reaches the airways. The nasal passages also produce nitric oxide, a molecule that plays a significant role in regulating blood flow, oxygen delivery, and immune function. Nasal breathing is, in every measurable sense, a more efficient and more health-promoting way to breathe than mouth breathing.

Nasal Breathing Diagram

Mouth breathing bypasses all of this. The air arrives in the lungs cold, dry, unfiltered, and without the nitric oxide that nasal breathing produces. Over time, chronic mouth breathing affects far more than lung function.

The Effects of Chronic Mouth Breathing on Children

In children, chronic mouth breathing, particularly during the years when the face and jaw are still developing, can have significant and lasting consequences across multiple body systems.

• Oral health: Mouth breathing reduces saliva production, which is the mouth’s primary defence against bacteria. This increases the risk of tooth decay, gum disease, and bad breath. It also contributes to teeth grinding and jaw tension, both of which are more common in habitual mouth breathers.
• Facial and dental development: The tongue’s resting position against the roof of the mouth acts as a natural shaper of the palate during development. When a child breathes through their mouth, the tongue drops to the floor of the mouth and this natural shaping does not occur. Over time, this can result in a high-arched, narrow palate, which simultaneously compromises the airway and contributes to dental crowding and misalignment
• Speech development: A high-arched palate affects the tongue’s range of movement for precise speech sounds. Chronic mouth breathing is associated with open-mouth resting posture, tongue thrust, and reduced articulation precision, all of which affect speech clarity. Read more in our post on speech development and the role of oral reflexes
• Sleep quality: Mouth breathing at night is associated with poorer sleep quality, snoring, and increased likelihood of sleep-disordered breathing. Poor sleep has direct and well-established effects on behaviour, attention, emotional regulation, and learning
• Nervous system activation: Mouth breathing tends to produce shallow, chest-based breathing rather than the deeper diaphragmatic breathing that activates the parasympathetic nervous system. This keeps the body in a mild state of sympathetic activation, the opposite of the calm, regulated state that learning and social engagement require

You might notice in your child: open-mouth resting posture (mouth hanging open at rest), snoring or noisy breathing during sleep, dry lips, frequent respiratory infections, dental crowding, or speech that sounds like the child has a blocked nose even when they do not.

Persistent mouth breathing in children is worth taking seriously and discussing with a healthcare provider or specialist. If it appears alongside fussy eating, thumb sucking, or oral sensory difficulties, it may be part of a broader oral sensory and reflex pattern worth assessing, something TDT’s combined speech therapy and reflex integration approach is specifically designed to address.

What Is Belly Breathing, And Why Is It Different From How Most of Us Breathe?

Belly breathing, also called diaphragmatic breathing, is breathing that uses the diaphragm as the primary muscle of respiration, rather than the chest muscles.

The diaphragm is a large, dome-shaped muscle that sits beneath the lungs. When it contracts on an inhale, it moves downward, creating space for the lungs to expand fully and drawing air deep into the lower lobes of the lungs, the most richly oxygenated part. The belly rises visibly because the downward movement of the diaphragm gently displaces the abdominal organs forward.

Chest breathing, by contrast, uses the intercostal muscles between the ribs to lift the chest on each inhale. This produces shallow breathing that primarily fills the upper lungs, which are less efficient for gas exchange. Chest breathing is the body’s default under stress, which is why people who are anxious, dysregulated, or chronically stressed tend to be chronic chest breathers.

Most adults, and many children, have lost contact with belly breathing. It requires neither equipment nor expertise to relearn, but it does require practice and patience.

The diaphragm does more than breathe. It is a postural muscle that supports spinal alignment, pelvic floor function, and intra-abdominal pressure regulation. It plays a role in organ function, lymphatic circulation, and vascular health. When the diaphragm is working well, its effects extend far beyond the respiratory system, which is one of the reasons belly breathing is such a powerful therapeutic tool.

How Breathing Directly Regulates the Nervous System

The connection between breathing and nervous system state is not metaphorical, it is physiological, direct, and bidirectional.

The autonomic nervous system has two primary branches: the sympathetic (fight, flight, or freeze — activation, alertness, stress response) and the parasympathetic (rest and digest — calm, safety, recovery). These two branches are in a constant dynamic balance, and breathing is one of the most powerful levers available to shift that balance in real time.

Slow, deep, diaphragmatic breathing, particularly when the exhale is longer than the inhale, directly activates the parasympathetic nervous system. It does this through a mechanism that involves the vagus nerve: the longest cranial nerve in the body, which runs from the brainstem through the lungs, heart, and gut, regulating everything from heart rate to emotional state to social engagement.

When the diaphragm moves downward on a deep inhale, it stimulates the vagus nerve through its proximity to the heart and the major vessels. The heart rate slows slightly on each exhale, a phenomenon called respiratory sinus arrhythmia, and this rhythm is itself a measure of vagal tone, the nervous system’s capacity for flexible, responsive regulation.

In plain terms: slow belly breathing sends a signal through the vagus nerve to the brain that the body is safe. And a brain that receives that signal shifts from a state of activation toward a state of calm readiness, the state in which learning, communication, and social engagement are genuinely accessible.

This is why belly breathing is one of the first tools we introduce in TDT’s programs, and why it is relevant across virtually every presenting concern we work with, from demand avoidance and emotional dysregulation to sensory processing difficulties and communication development.

The CO2 Connection

One aspect of breathing that surprises many people is the role of carbon dioxide. We tend to think of CO2 as simply a waste product, something to breathe out and be rid of. But CO2 serves a critical regulatory function: it is the body’s primary trigger for the urge to breathe, and it plays a central role in regulating blood pH, dilating blood vessels, and facilitating the release of oxygen from haemoglobin into the tissues.

Chronic over breathing, taking more breaths than needed, or breathing more shallowly and rapidly than the metabolic demand requires, reduces CO2 levels in the blood. This has several consequences: airways and blood vessels constrict slightly, oxygen delivery to tissues actually becomes less efficient despite more air being taken in, and the nervous system becomes more sensitised and reactive.

Slow nasal breathing, particularly breathing that allows a natural pause after the exhale before the next inhale, maintains healthy CO2 levels and supports more efficient oxygen delivery, calmer airways, and a less reactive nervous system. This is one of the physiological reasons why slower breathing produces better regulation.

How to Practise Belly Breathing: Step by Step

The following exercises are appropriate for children and adults alike. Choose the version that suits the age and engagement level of your child, for younger children, the more playful and embodied the better. For older children and adults, the more precise versions may feel more satisfying.

Breathing exercise Diaphragmatic Breathing

  Exercise 1: Smell the Flowers, Blow Out the Candles (Ages 2+)

This is the simplest and most universally accessible introduction to controlled breathing. It works because it is fully embodied, the images do the technical work without any explanation needed.

• Ask your child to imagine they are holding a beautiful flower in one hand and a birthday candle in the other
• ‘Smell the flower’ : inhale slowly through the nose for a count of three to four, letting the belly rise
• ‘Blow out the candle’ : exhale slowly through the mouth for a count of four to six, blowing gently rather than forcefully
• Repeat three to five times, keeping the pace slow and the tone warm and playful

💡  Make it silly, use a real flower, pretend the candle keeps relighting, try blowing as slowly as possible. Children who are laughing are already regulating. The breathing is a bonus.

  Exercise 2: Teddy Bear Breathing (Ages 2–6)

Lying-down breathing is often easier for children because the belly rising and falling is more visible, and therefore more motivating, when the body is horizontal.

• Ask your child to lie on their back and place a small soft toy on their belly
• ‘Breathe in and make the teddy rise up to the ceiling’ : slow nasal inhale, belly expands
• ‘Breathe out and let the teddy sink back down’ : slow exhale through the mouth or nose
• Watch the teddy together and comment on its movement : this keeps the child’s attention on their belly rather than their chest

💡  This exercise is also excellent for settling before sleep. If your child has trouble falling asleep, three to five rounds of teddy bear breathing in bed can shift the nervous system toward a sleepier state within minutes.

  Exercise 3: Triangle Breathing (Ages 5+)

Triangle breathing introduces a simple rhythm that is easy to remember and works well for children who are beginning to manage their own regulation more consciously.

• Inhale through the nose for 3 counts
• Hold gently at the top for 3 counts
• Exhale slowly through the mouth for 3 counts
• Trace a triangle in the air with one finger as you breathe, one side for each phase

Increase to 4 counts per phase as the child becomes comfortable. The hold at the top and the slow exhale are where most of the vagal activation occurs.

  Exercise 4: Box Breathing (Ages 7+)

Box breathing adds a fourth phase — a hold after the exhale — which deepens the parasympathetic response and is particularly effective for managing acute anxiety or high activation states.

• Inhale through the nose for 4 counts
• Hold at the top for 4 counts
• Exhale slowly through the mouth for 4 counts
• Hold at the bottom for 4 counts
• Repeat for four to six rounds

This technique is used by military personnel, athletes, and clinical settings precisely because it is so reliably effective at rapidly shifting autonomic state. It can be taught to children as young as seven with simple visual support, tracing the four sides of a square as they breathe.

  Exercise 5: Humming Breath (All Ages)

Humming on the exhale is one of the most direct ways to stimulate the vagus nerve through vibration in the throat and chest. It is also one of the most enjoyable, children who are resistant to “breathing exercises” will often happily hum along to a simple tune.

• Inhale slowly through the nose
• Exhale with a gentle hum, any pitch, any tune
• Feel the vibration in the chest, throat, and lips
• Repeat five to ten times

💡  Singing achieves the same vagal stimulation as humming, and for younger children it is usually even more engaging. A slow, familiar song sung softly together can be one of the most effective regulation tools in a parent’s toolkit, and one of the most connecting.

When and How to Use Breathing Exercises Most Effectively

Breathing exercises work best when they are practised before dysregulation occurs — as a preventive and regulatory practice, rather than introduced for the first time in the middle of a meltdown or crisis.

A child who has never encountered belly breathing before will not find it accessible when they are in a full stress response. The nervous system in high activation cannot engage with new learning. Introducing breathing as a pleasant, playful part of the daily routine, during a calm moment, as a connection activity, as part of the bedtime wind-down, means it is available as a familiar and trusted tool when it is needed most.

When to Practise

• Morning: One to three minutes of belly breathing before school can meaningfully reduce the baseline activation level the child arrives with
• Before transitions: A few slow breaths before leaving the house, before entering a classroom, or before a challenging activity reduces the neurological cost of the transition
• Before meals: Calm breathing before eating supports better digestive function and reduces the nervous system activation that can contribute to fussy eating
• Before sleep: The wind-down effect of belly breathing supports melatonin production and nervous system settling
• During calm moments: The more regularly belly breathing is practised in neutral states, the more automatic it becomes, and the more readily it is accessible under stress

What Not to Do

• Do not introduce belly breathing for the first time during a meltdown or crisis, this is not the moment for new learning
• Do not make it a demand, frame it as an activity you are doing together, not something the child is required to perform
• Do not rush the exhale, a hurried exhale defeats the purpose. The slower the exhale, the stronger the vagal activation
• Do not use it as a punishment or a substitute for genuine connection, ‘go do your breathing’ sent from across the room is not the same as ‘let’s do some breathing together’

💡  Model it yourself. Children who see a regulated adult choose to breathe slowly and deliberately learn something far more powerful than any instruction can teach: that managing the nervous system is something grown-ups do too, and that it works.

How Belly Breathing Connects to TDT’s Broader Programs

Belly breathing is not a standalone intervention, it is one component of a broader approach to nervous system regulation that runs through everything TDT does.

Emily’s reflex integration and neuroplasticity programs address the foundational nervous system organisation that determines how easily a child can access regulation in the first place. When retained primitive reflexes are keeping the nervous system in a chronically activated state, breathing exercises help, but they are working against a current. As reflex integration progresses and the nervous system’s baseline activation reduces, breathing tools become more effective and more readily accessible, because the system they are trying to regulate is no longer so persistently dysregulated.

Breathing is also directly relevant to speech and communication development, breath support is fundamental to vocalisation, and the oral posture patterns associated with mouth breathing directly affect the articulatory precision that speech requires. Fiona’s speech therapy sessions integrate breath awareness as part of the foundational work that precedes and supports sound-level therapy.

For children with demand avoidance or significant anxiety, belly breathing is often one of the first practical tools we introduce, precisely because it is something the child can do independently, without requiring anything from another person, in any environment. That sense of agency and self-efficacy is itself therapeutic.

And for the families we support through our mentored support worker program, breathing exercises are among the most commonly embedded strategies, because they are portable, require no equipment, and can be woven into the natural rhythm of any day in any environment.

Read about the wider role of the vagus nerve, the primary pathway through which breathing achieves its regulatory effects, in our dedicated post on unlocking the power of the vagus nerve.

Frequently Asked Questions

My child refuses to do breathing exercises. What can I do?

This is very common, particularly for children whose nervous systems are already significantly activated, or who have a demand avoidance profile. The most important thing is not to make it a demand. Instead, model it yourself without any expectation that your child will join in. Hum quietly. Take slow, visible breaths. Blow out birthday candles on a cupcake. Do the teddy bear exercise on your own belly and narrate it playfully. Over time, curiosity tends to win, and a child who joins in because they are curious will engage with it far more genuinely than one who is complying under pressure.

How quickly does belly breathing work?

The physiological shift from sympathetic activation toward parasympathetic calm begins within a few breath cycles, typically within 60 to 90 seconds of slow, diaphragmatic breathing. This is why even three to five slow breaths before a challenging moment can make a measurable difference. However, the deeper and more sustained benefits, improved baseline regulation, reduced reactivity, better sleep, come from consistent daily practice over weeks and months rather than from occasional use in crisis moments.

Is mouth breathing always a problem?

Mouth breathing during exercise and during illness is normal and appropriate, the body needs more air than the nose can efficiently supply in these situations. The concern is habitual mouth breathing during rest, sleep, and ordinary activity, particularly in children during the developmental years when facial structure is still being shaped. If your child is a habitual mouth breather, it is worth discussing with a healthcare provider, a speech therapist, or an ENT specialist.

My child snores at night. Is this related?

Snoring in children is often associated with mouth breathing during sleep and can indicate sleep-disordered breathing worth investigating. It is not a normal developmental variation that should be dismissed. Persistent snoring in children, particularly when accompanied by restless sleep, daytime fatigue, or behaviour and attention difficulties, warrants a conversation with a healthcare provider. It may also be worth exploring whether oral posture, retained oral reflexes, or nasal obstruction are contributing.

Can belly breathing help with toileting difficulties?

Yes, in a meaningful way. The diaphragm’s movement during belly breathing directly stimulates the vagus nerve, which regulates the gut-brain connection and contributes to bowel motility and bladder awareness. For children who struggle with interoception — the ability to sense internal body states, improving vagal tone through regular belly breathing can be one component of supporting better bodily awareness. Read more in our post on how TDT supports toileting difficulties.

Do adults benefit from belly breathing too?

Absolutely. The nervous system regulation benefits of belly breathing apply at every age. Many adults have been habitual chest breathers for so long that belly breathing initially feels foreign or even slightly uncomfortable, the diaphragm needs to be retrained. Two to three minutes of deliberate belly breathing daily is sufficient to begin reestablishing the pattern, and most adults notice meaningful differences in their baseline stress levels within a few weeks of consistent practice.

Want to build breathing into a broader regulation program for your child?

TDT’s individualised programs address the nervous system foundations that make regulation possible.