Bronchiolitis

What is bronchiolitis?

Bronchiolitis is a common chest infection caused by a virus.

Bronchiolitis causes difficulty breathing. It usually affects children under 12 months of age.

It is infectious (spreads from person to person). It is more common in autumn and winter.

What are the symptoms of bronchiolitis?

At first it will look like your baby has a winter cold. After a couple of days, they might get worse.

Symptoms include:

• a runny nose
• cough
• fever
• fast breathing
• working hard to breath
• wheeze (may be a whistling sound in chest)
• less interest in eating

Your child might find it hard to eat and drink. If your baby is not able to drink, they may become dehydrated.

What causes bronchiolitis?

Bronchiolitis is an infection often caused by the respiratory syncytial virus (RSV). Bronchiolitis can also be caused by another virus.

The small airways in the lungs become clogged with fluid and mucus, making it hard to breathe.

If your baby was born prematurely (early), or has other health problems, they may get worse symptoms.

The virus spreads through small droplets when infected people cough, talk or sneeze.

When should I see my doctor?

Often the illness is mild, and you can look after your child at home. If you are worried that your child has bronchiolitis, take them to the doctor. It can get worse quickly.

Always take your baby to the doctor if they are:

• less than 10 weeks of age or were born early
• have a lung disease or a weakened immune system
• not eating or drinking as much as usual
• breathing very fast, wheezing or having difficulty breathing
• very tired, hard to wake or irritable
• not weeing as much as usual (less wet nappies)
• pale and sweaty
• getting worse quickly

As a guide, a baby is not eating or drinking as much as usual if they have:

• less than half of their feed for two or more feeds
• a dry nappy for 12 hours or more