This is caused by a viral infection and usually occurs in babies and children under 2 years.
Toddlers and babies usually have symptoms of a cold first, then can develop a cough, sound wheezy and breathe quickly. They may find it hard to breathe and have a fever. The cough and breathing problems can also make it hard for your baby to feed. Your baby may need extra feeds to make sure they are getting enough to drink.
Bronchiolitis can cause young babies to become very unwell.
They need to be seen by a doctor if they have any of these symptoms. You need to see a doctor urgently if they are getting worse (even if they have just seen a doctor), having difficulty breathing, breathing fast or having difficulty feeding, or not wetting as many nappies.
For help and advice call PlunketLine 0800 933 922, 24 hours a day, 7 days a week.
If your child is sick please call Healthline, 0800 611 116, New Zealand's 24-hour telephone health advice service. All calls are answered by registered nurses.
In an emergency phone 111.