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What bronchiolitis is
Bronchiolitis is a common chest infection that mainly affects babies and very young children. It usually happens in the winter months and is often caused by a virus, most commonly respiratory syncytial virus, or RSV.
The infection causes swelling and mucus in the small airways of the lungs. This makes it harder for a child to breathe, feed and stay comfortable.
Signs and symptoms
Early symptoms can look like a cold, with a blocked nose, cough and mild fever. Over the next day or two, a child may start breathing faster or making wheezing noises.
Babies may find feeding difficult because breathing takes more effort. Some children become sleepy, irritable or less interested in drinking.
When to seek help
Most children with bronchiolitis get better with time and simple supportive care. However, parents should seek medical advice if a child is working hard to breathe, has poor feeding, or seems unusually drowsy.
Immediate help is needed if there are pauses in breathing, the lips look blue, or the child is too unwell to drink. In the UK, NHS 111 or urgent care services can help decide what to do next.
Treatment and care
There is usually no specific medicine that cures bronchiolitis. Antibiotics do not help unless there is a separate bacterial infection, because bronchiolitis is normally caused by a virus.
Treatment focuses on supporting the child while the illness runs its course. This may include helping with oxygen, fluids, or tube feeding in hospital if breathing is difficult or intake is low.
Preventing chest infections
Good hand hygiene is one of the best ways to reduce the spread of viruses. Avoiding contact with people who have coughs and colds can also help, especially for newborn babies and premature infants.
Parents are often advised to keep smoke away from young children, as passive smoking can worsen chest infections. Keeping up to date with routine vaccinations also helps protect children from some serious infections.
Practical advice for parents
It can be worrying when a baby has a chest infection, but most cases improve without lasting problems. Watching for breathing effort, feeding changes and hydration is often more useful than the exact temperature.
If you are unsure, trust your instincts and ask for help. Early advice can make a big difference and can reassure families that they are doing the right thing.
Frequently Asked Questions
Common symptoms include cough, wheezing, fast or difficult breathing, fever, runny nose, reduced feeding, and fewer wet nappies. Bronchiolitis often starts like a cold and can worsen over a few days.
Bronchiolitis is usually caused by a viral infection, especially respiratory syncytial virus (RSV). Chest infections in young children can be caused by viruses or bacteria, though many are viral and improve with supportive care.
Diagnosis is usually based on the child's symptoms, breathing pattern, and a physical examination. Tests are not always needed unless the child is very unwell, the diagnosis is unclear, or there are concerns about complications.
Seek urgent medical help if the child has severe breathing trouble, blue lips or face, pauses in breathing, extreme drowsiness, signs of dehydration, or cannot drink enough to stay hydrated.
Treatment is mostly supportive and may include fluids, nasal suctioning, fever relief, and oxygen if needed. Antibiotics do not help viral bronchiolitis and are only used if a bacterial infection is suspected or confirmed.
Antibiotics do not treat viral bronchiolitis. They may be prescribed for some chest infections if a clinician believes bacteria are involved, but many young children recover without antibiotics.
Risk can be reduced by good hand hygiene, avoiding smoke exposure, keeping sick contacts away when possible, and following vaccination schedules. In some high-risk children, preventive medicines or antibodies may be considered.
Offer small frequent feeds, keep the child comfortable, use saline drops and gentle suction for a blocked nose, and monitor breathing and hydration. Follow any advice from a healthcare professional.
Most viral infections improve over 1 to 2 weeks, though cough and wheeze can last longer. Breathing is often worst during the first few days before gradual recovery begins.
Yes, many are contagious, especially when caused by viruses. They spread through droplets, close contact, and contaminated hands or surfaces, so hygiene and limiting exposure can help.
Higher-risk children include premature babies, infants under 3 months, children with heart or lung conditions, weakened immune systems, and those exposed to tobacco smoke.
Yes, bronchiolitis commonly causes wheezing because the small airways become inflamed and narrowed. Wheezing can also occur with other chest infections, so a clinician may need to assess the child.
A doctor should assess young children if breathing is fast or difficult, feeding is poor, fever is persistent, the child seems unusually sleepy, or symptoms are worsening instead of improving.
Yes, because breathing difficulties and a blocked nose can make feeding harder. Signs of dehydration include fewer wet nappies, a dry mouth, no tears when crying, and unusual sleepiness.
Worsening signs include faster breathing, chest retractions, grunting, bluish skin or lips, reduced feeding, increasing sleepiness, and fewer wet nappies. These need prompt medical assessment.
Inhalers do not usually help typical bronchiolitis. Some children with asthma-like symptoms or a different diagnosis may benefit from inhaled medicines, but this should be decided by a clinician.
Yes, symptoms such as wheezing and cough can overlap. Bronchiolitis is more common in infants and usually follows a viral cold, while asthma is a chronic condition that may need different treatment.
Wash hands often, clean shared toys and surfaces, cover coughs and sneezes, keep sick children away from others when possible, and avoid close contact with newborns or high-risk infants when unwell.
Children can usually return when they are breathing comfortably, eating and drinking well, and no longer too unwell to take part. If they still have significant fever or breathing difficulty, they should stay home and be reviewed.
Possible complications include dehydration, low oxygen levels, worsening breathing problems, ear infections, and, less commonly, hospital admission. Most children recover fully with appropriate care.
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