Nasal Flaring in Babies
Content reviewed against published AAP, WHO, CDC guidelines
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Nasal flaring—the widening of the nostrils with each breath—is a sign of increased work of breathing (respiratory distress) in babies and young children. It occurs because the baby is trying to take in more air by opening the nasal passages wider. While momentary flaring during crying or heavy exertion is normal, persistent nasal flaring at rest is an important warning sign that should be evaluated promptly, as it indicates the baby is working harder than normal to breathe.
Key takeaways
- Nasal flaring—the widening of the nostrils with each breath—is a sign of increased work of breathing (respiratory distress) in babies and young children.
- Most common cause: Bronchiolitis (RSV or other viral)
- Emergency: Persistent nasal flaring at rest with grunting or head bobbing
- Home care: Nasal flaring at rest is a sign of respiratory distress—seek medical evaluation, do not rely on home remedies alone
Possible Causes
When to Seek Help
Emergency — Call 911 or go to ER:
- Persistent nasal flaring at rest with grunting or head bobbing
- Nasal flaring with blue or gray color around lips or face
- Nasal flaring with severe chest retractions (skin pulling deeply between ribs)
- Nasal flaring in a baby who is becoming limp or less responsive
- Nasal flaring with inability to feed or drink anything
Urgent — See doctor today:
- Nasal flaring at rest without immediate emergency signs but persistent
- Nasal flaring with fast breathing and mild retractions
- Nasal flaring that is new and worsening over hours
- Nasal flaring with high fever in a young infant
Same-day appointment:
- Mild intermittent flaring during feeds only with congestion
- Flaring that resolves with nasal suctioning but recurs
Monitor at home:
- Brief flaring only during crying that resolves completely at rest
- Very mild flaring in a congested baby who is feeding and breathing normally otherwise
By Age
0-3 months
Normal: Very brief nasal flaring during crying or straining is normal. Newborns may have mild flaring during the first few hours of life as they transition to breathing air.
Worry if: Any persistent nasal flaring at rest or during feeding. Combined with grunting, chest retractions, or fast breathing, it indicates significant respiratory distress. In newborns, flaring persisting beyond the first few hours of life is concerning.
3-12 months
Normal: Brief flaring during vigorous crying or physical activity can be normal. Should resolve immediately when baby calms down.
Worry if: Nasal flaring at rest or during quiet breathing, flaring during or after feeding, flaring with chest retractions (skin pulling in around ribs), fast breathing, or any blue/gray discoloration.
1-3 years
Normal: Brief flaring during intense activity or crying is normal and resolves at rest.
Worry if: Persistent flaring at rest, flaring with intercostal or subcostal retractions, unable to speak in full sentences (for verbal toddlers), refusal to eat or drink, or worsening over hours.
Home Care
- Nasal flaring at rest is a sign of respiratory distress—seek medical evaluation, do not rely on home remedies alone
- While awaiting care: keep baby upright or at a 30-45 degree angle
- Use saline drops and gentle suction if nasal congestion is contributing
- Remove any tight clothing around baby's chest and neck
- Keep the environment cool and well-ventilated
- Offer small frequent feeds to maintain hydration without tiring baby
- Monitor and count the respiratory rate for 60 seconds to report to the doctor
- Do NOT give any cough or cold medications to babies under 2
- Record a video of the breathing pattern to show the healthcare provider
Need help deciding what to do?
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Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
Related Symptoms
Bottom line
Most cases of nasal flaring in babies are not emergencies. However, seek immediate care if persistent nasal flaring at rest with grunting or head bobbing.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.