Cough after bronchiolitis: what to know

Bronchiolitis causes swelling and mucus in the small airways. Even after the hardest part of the illness has settled, those airways may remain sensitive, so coughing can be triggered by crying, feeding, activity, or cool air. A loose cough may help clear mucus. Mild noisy breathing or occasional wheeze can also take time to settle, but the overall pattern should gradually improve rather than become more effortful.

A cough that suddenly becomes harsher, is accompanied by renewed fever, or follows a period of clear improvement may represent another infection or a complication. Cough alone does not show how well a young child is breathing; look at breathing effort, alertness, drinking, and wet nappies as well.

Offer breastfeeds, formula, or the child’s usual fluids in smaller, more frequent amounts if coughing makes feeds tiring. Keep the child upright during feeds and for a short time afterwards, while staying close and following safe-sleep guidance. Saline nose drops and gentle clearing of the nose may make breathing and feeding easier. Keep smoke, vaping, strong fragrances, and dust away from the child.

Check the child regularly, including during sleep, for faster breathing, pulling in between or under the ribs, pauses, bluish or grey lips, unusual sleepiness, and reduced urine. Do not give over-the-counter cough or cold medicines to a young child unless a clinician specifically advises them. A nebuliser is not automatically needed for a lingering cough; a clinician should decide whether any inhaled treatment is appropriate.

Seek urgent help if the child is struggling to breathe, has pauses in breathing, develops blue or grey colouring around the lips, is difficult to wake, or cannot drink. Arrange prompt medical review if feeds are much smaller, wet nappies are clearly reduced, breathing is getting faster or harder, wheezing is persistent, or fever returns after improvement. Infants who were born prematurely or have heart, lung, or immune problems may need earlier advice because respiratory illnesses can become serious more quickly.

A child-health clinician can listen to the chest, assess hydration and breathing effort, and decide whether the cough fits recovery or needs another explanation. Bring a list of medicines and describe when the cough is worst, whether it interrupts sleep or feeds, and how breathing has changed.

Ask: Does my child’s breathing effort look like recovery? Could the cough be related to mucus, wheezing, or a new infection? What signs should make us seek urgent help? Is any inhaled treatment appropriate, and how should it be used? When should feeding and wet nappies return to the child’s usual pattern?