The breathless child: croup and bronchiolitis — a case

The presentation

It is 2am in late November. A worried parent brings 18-month-old "Amara" (an illustrative example) to an urgent care centre. For two days she has had a runny nose and mild fever. Tonight she woke with a harsh, barking cough — the parent says it sounds "like a seal". When she breathes in there is a rasping noise, and she is more settled sitting up on a lap than lying flat. She is upset but consolable, her lips are pink, and between coughing fits she is drinking small sips of juice. The clinician notes she is alert, making eye contact, and her breathing eases when she calms down. This picture — barking cough, noisy in-breath, worse at night — points towards croup.

Croup versus bronchiolitis

Croup and bronchiolitis are both viral and both cause breathlessness, but they affect different parts of the airway. Croup swells the upper airway around the voice box and windpipe, giving the classic barking cough and stridor — a harsh noise heard when breathing in. It typically affects toddlers and is usually worse at night. Bronchiolitis affects the tiny airways deep in the lungs and mainly hits babies under one, especially under six months. It causes a wheezy, crackly chest, fast breathing, a persistent cough and — crucially — feeding difficulty, because a blocked-up baby cannot suck and breathe at the same time. Telling them apart guides what to expect and what to watch for.

Assessment and what usually helps

The clinician's job is to judge how hard the child is working to breathe, not just to name the virus. They watch the chest for tugging in between the ribs or under the ribcage, count the breathing rate, check the child's colour and alertness, and see whether feeding or drinking is holding up. For Amara's croup, a short course of an anti-inflammatory steroid medicine is the standard NHS treatment to reduce airway swelling; most children improve within hours. Keeping the child calm matters, because distress worsens the noisy breathing. For milder bronchiolitis, there is no medicine that cures it — the mainstay is supportive care: small frequent feeds, keeping the nose clear, and time, as it runs its course over one to two weeks.

Red flags that change everything

Some signs mean a child is struggling and needs emergency help. Call 999 or go straight to A&E if a child is working very hard to breathe — sucking in under the ribs or at the base of the neck, the tummy heaving, or grunting with each breath. Call 999 if their lips, tongue or skin look blue, grey or unusually pale; if they are too breathless to feed, talk or cry; if they are floppy, unusually drowsy or very hard to wake; or if they have pauses in breathing. Noisy breathing that continues while the child is calm and at rest, rather than only when upset, is also a warning sign. Trust your instinct: if a child looks seriously unwell, do not wait.

Safety-netting and follow-up

Most children with croup or bronchiolitis recover at home, but safety-netting — knowing what to look for and when to act — is the heart of good care. Parents are advised to keep the child comfortable and well hydrated, offer small frequent drinks, and use children's fever medicines only if the child is distressed by fever. They should seek help via NHS 111 if breathing is getting harder, if the child is drinking much less than usual or has fewer wet nappies, or if fever persists. Babies under three months, premature babies, and children with heart or lung conditions are watched more closely. Symptoms often peak on days three to five before easing.