Barking Cough (Croup) in Babies & Toddlers
Content reviewed against published AAP, NICE, Cochrane guidelines
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A barking cough sounds like a seal or dog bark and is the hallmark symptom of croup (laryngotracheobronchitis). It is caused by swelling of the voice box (larynx) and windpipe (trachea), usually due to a viral infection. Croup is most common in children aged 6 months to 3 years and characteristically worsens at night. Stridor (a harsh sound when breathing in) may accompany the cough.
Key takeaways
- A barking cough sounds like a seal or dog bark and is the hallmark symptom of croup (laryngotracheobronchitis).
- Most common cause: Viral croup (parainfluenza virus most common)
- Emergency: Stridor that is loud at rest and baby appears distressed
- Home care: Cool night air: bundle baby up and step outside for 10-15 minutes — cold air reduces airway swelling
Possible Causes
When to Seek Help
Emergency — Call 911 or go to ER:
- Stridor that is loud at rest and baby appears distressed
- Blue or gray color around lips or fingernails
- Drooling with inability to swallow (possible epiglottitis)
- Child appears very anxious, is silent, or is losing consciousness
- Severe chest retractions with each breath
- Croup not improving after 20 minutes of steam or cool air
Urgent — See doctor today:
- Stridor audible when child is calm and at rest
- Moderate chest retractions with breathing
- Child unable or unwilling to drink fluids
- Croup with high fever above 104°F (40°C)
- Barking cough in a baby under 6 months
Same-day appointment:
- First episode of croup for evaluation and possible steroid prescription
- Croup lasting more than 5-7 days
- Mild stridor only when crying or upset but child otherwise comfortable
Monitor at home:
- Barking cough at night with no stridor and child comfortable between episodes
- Mild croup improving with cool air exposure
- Known croup pattern (previously diagnosed) with mild symptoms responding to home care
By Age
0-6 months
Normal: Croup is uncommon under 6 months. Any barking cough or stridor at this age is more concerning and warrants prompt evaluation.
Worry if: Any barking cough or stridor in a baby under 6 months should be evaluated promptly, as it may indicate a structural airway issue or more serious infection.
6 months-2 years
Normal: Peak age for croup. Typical pattern: starts as cold symptoms, develops barking cough and possibly stridor at night. Worse for 2-3 nights then gradually improves over 5-7 days.
Worry if: Stridor at rest (not just when crying), chest retractions, drooling or inability to swallow, high fever above 104°F, or croup lasting more than 7 days.
2-5 years
Normal: Still common age for croup, though children are less likely to develop severe symptoms as airways are larger. Barking cough that is worse at night and improves during the day.
Worry if: Stridor while resting, unable to drink fluids, leaning forward and drooling (possible epiglottitis — very rare but dangerous), blue or gray color.
5+ years
Normal: Croup becomes uncommon after age 5-6. Barking cough at this age may have other causes.
Worry if: Barking cough or stridor in an older child is less typical and may need investigation for structural causes or other conditions.
Home Care
- Cool night air: bundle baby up and step outside for 10-15 minutes — cold air reduces airway swelling
- Run a hot shower and sit in the steamy bathroom for 15-20 minutes (though evidence is mixed)
- Cool-mist humidifier near the crib at night
- Keep baby calm — crying worsens airway swelling and stridor
- Elevate the head of the bed slightly
- Offer warm clear fluids (for babies over 6 months) to soothe the throat
- Sit upright and hold baby when symptoms flare
- Acetaminophen or ibuprofen (age-appropriate) for fever and discomfort
- If prescribed, administer oral dexamethasone as directed — this is the most effective treatment
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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 barking cough (croup) in babies are not emergencies. However, seek immediate care if stridor that is loud at rest and baby appears distressed.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.