A cough in a baby or toddler: when to see a doctor?

When does a child's cough need a doctor?

A cough on its own says little. What decides how urgent it is: how hard your child is working to breathe, how fast, the colour of the lips, whether they drink, and how old they are. The checker works through those in this order and stops at the first level that fits.

1. Emergency. Struggling to breathe, grunting, ribs sucking in, pauses in breathing, blue or grey colour (also during a coughing fit), a floppy child, drooling with noisy breathing, a cough that started with choking, or breathing trouble right after a sting, a medicine or a food. Under 2 years, more than 70 breaths a minute. These come from the NHS emergency lists for bronchiolitis, croup and whooping cough, and from the Seattle Children's breathing trouble list.
2. See a doctor now. A harsh sound on breathing in while calm (stridor), wheezing, fast breathing for the age, chest pain, coughing up blood, drinking less than half the usual or no wet diaper for 12 hours, a child who looks very sick, a chronic heart or lung condition. Under 3 months, any fever. A fever above 104°F (40°C). Coughing fits under 6 months.
3. Call today. Coughing fits from 6 months, a barking cough, earache, a fever of 102.2°F (39°C) or more from 3 months, a fever longer than 3 days or one that came back, coughing during feeds, a cough that is getting worse. Under 6 months, any cough.
4. Book a visit. A cough that has lasted 3 weeks or more, or vomiting from coughing 3 or more times.
5. Watch at home. None of the above. The checker tells you until when, and which signs would change the answer.

Fast breathing, by age

The fast breathing limits are the World Health Organization's for a child with a cough or difficult breathing (WHO IMCI, 2014). The 70 a minute line is from NICE NG9, the guideline for bronchiolitis in children under 2, so the checker only uses it up to that age. Count while your child is calm or asleep: crying speeds breathing up, so a count taken then reads high.

What the sound can tell you

• Barking, like a seal, often at night. Usually croup. It tends to settle within 48 hours. Keep your child upright and calm. The NHS advises against steam: no steamy bathroom, no inhaling steam.
• Fits of coughing that end in a whoop or vomiting. Can be whooping cough. Young babies may not whoop at all; they may struggle to breathe or turn blue instead (NHS).
• Wheezing, a whistle on breathing out. The small airways are narrowed, for example with bronchiolitis or asthma. A doctor should listen.
• A sudden cough after choking. Peanuts and seeds are the usual culprits, and the peak age is 1 to 4. The coughing can stop while the object stays put, so it still needs a doctor.

While you watch

• Offer drinks and feeds often.
• Honey can ease a night cough from age 1 (AAP). Never before 1, because of the risk of infant botulism.
• No over-the-counter cough and cold medicines under age 4 (AAP). In the UK they are not used under 6 (MHRA).
• Check the breathing again at night, when coughs and croup tend to be worse. Count once more if you are unsure.

Methodology

Emergency signs are the NHS 999 lists for bronchiolitis, croup and whooping cough together with the Seattle Children's (Schmitt-Thompson) "call 911" lists for cough and breathing trouble. Where the two disagree, the stricter one is used: turning blue during a coughing fit is 999 at the NHS and "seek care now" at Seattle, so here it is an emergency. Breathing limits are the WHO chart for cough or difficult breathing, and NICE NG9's more than 70 a minute applies only under 2 years. Same-day and book-a-visit signs are Seattle Children's, with the NHS line for 102.2°F (39°C) from 3 months and the NHS 3-week limit for a cough. Coughing during feeds comes from the warning signs in the Croatian pediatric cough guideline (2023).

Made by: the KidyGrow team, from the guidance listed below.

Last reviewed: October 2026.