Reviewed by Dr. Marai Vales
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Reading time: three minutes
Babies are natural nose breathers from birth. Mouth breathing is not a normal developmental stage, but it may begin when something interferes with normal nasal breathing.
Table of Contents
At What Age Do Babies Start Mouth Breathing?
Babies do not naturally “start” breathing through their mouth at a specific age. However, they typically develop the ability to breathe through their mouth around 3 to 4 months of age.
Even after this point, breathing through the nose remains the normal pattern throughout infancy and early childhood. Mouth breathing usually occurs only when the nasal passage is blocked. This can happen at any age, including infancy, but it is not considered usual or developmental.
Occasionally breathing through the mouth during illness is expected. If it continues after the illness has resolved, it may require evaluation.
Why Might a Baby Start Mouth Breathing?
Breathing through the mouth is usually a response to reduced airflow through the nose.
Common causes include:
- Congested nasal passages from a cold or mucus buildup
- Allergies that affect the airway
- Enlarged tonsils
- Enlarged adenoids
- Structural differences, such as a deviated septum
- Airway restriction such as sleep apnea
In many cases, it is an adaptation. The body opens the mouth to maintain oxygen flow when nasal breathing is limited.
How Mouth Breathing Affects Teeth and Development
When a baby breathes through their nose, the tongue rests against the roof of the mouth. This supports proper jaw growth and development.
When breathing occurs through the mouth for extended periods:
- The tongue rests lower in the mouth
- The upper jaw may become narrower
- Teeth may become crowded
- Bite alignment may change
Breathing through the mouth may also contribute to dry mouth, which increases the risk of tooth decay and gum irritation due to reduced saliva. These changes develop gradually and are more likely with long term breathing patterns that bypass the nose.
Monitoring Breathing and Oral Development
At Sunny Smiles, early dental visits include monitoring your child’s oral development as they grow, including how airway function may influence jaw growth and tooth alignment.
Evaluation may involve a clinical exam and, when appropriate, imaging to better understand development. Tracking these patterns early helps identify concerns and guide appropriate recommendations.
Pediatric Dentist in St. Petersburg, FL
We are always accepting new patients! To book an appointment at our pediatric dental office in St.Petersburg, call (727) 914-6611 or visit us at 8525 Dr MLK Jr St N St Petersburg, FL 33702.
FAQ
Is mouth breathing linked to feeding difficulties in babies?
It can be. Babies rely on nasal breathing during feeding. If nasal airflow is limited, they may have trouble latching, feeding efficiently, or staying comfortable while feeding.
Can pacifier use cause mouth breathing?
Pacifier use does not directly cause it, but prolonged use may influence jaw development and tongue position, which can contribute to airway changes over time.
Does mouth breathing go away on its own?
If caused by temporary congestion, it may resolve. Ongoing mouth breathing should be evaluated.
Does mouth breathing affect a baby’s facial development?
Ongoing mouth breathing may influence how the face develops over time. It can contribute to a longer facial appearance or changes in jaw positioning as a child grows.
