Wheezing in Babies

When to get help

Call 999 or go to A and E if your baby is finding it hard to breathe, is breathing very fast, is grunting with each breath, is pulling their tummy in under the ribs or sucking in between the ribs with each breath, is too breathless to feed, becomes floppy or unresponsive, or if their lips, tongue, face or skin turn blue, grey or pale. NHS guidance notes that on black or brown skin, colour change may be easier to see on the palms of the hands or the soles of the feet.

Asthma and Lung UK is direct about the emergency end of this: if your child is coughing, wheezing and finding it hard to breathe, they could be having an asthma attack, and you should call 999.

Get an urgent GP appointment or call NHS 111 the same day if your baby is wheezing and is unwell or breathless with it, if they are not sleeping well, are off their food and drink, or seem irritable, or if you are at all worried. Asthma and Lung UK gives exactly that list, and adds that a viral wheeze is usually nothing to worry about as long as your child seems well in general, but that if they are unwell or breathless with the wheeze, or you are at all worried, you should see your GP as soon as possible or call 111.

The age thresholds that change the urgency

If a wheezing baby also has a fever, age decides how fast you act. NICE guideline NG143 on fever in under 5s states that children younger than 3 months with a temperature of 38C or higher are in a high-risk group for serious illness, and that children aged 3 to 6 months with a temperature of 39C or higher are in at least an intermediate-risk group. A baby under three months who is wheezing and has a temperature of 38C or more needs to be assessed urgently on the fever alone, regardless of how the breathing looks.

NG143 also places a respiratory rate greater than 60 breaths per minute in the red, high-risk column, and grunting among the high-risk signs.

What a wheeze actually is

Asthma and Lung UK defines it precisely: wheezing is a high-pitched whistling sound that you can usually hear when someone breathes out, it can be heard from the chest, and it is caused by the airways narrowing.

That definition matters because most sounds parents call wheezing are not wheezing. Snuffly, rattly noises from the nose and upper airway are extremely common in babies and are transmitted from the top of the airway rather than the chest. A true wheeze is on the out-breath and comes from the chest.

Why it is so common under five

Asthma and Lung UK reports that preschool wheeze is very common and that one in three children will have an episode of wheezing by the time they are three years old. The explanation it gives is anatomical: children under the age of five wheeze more easily than older children and adults because their airways are smaller. A degree of narrowing that an adult would not notice produces an audible whistle in a baby.

The commonest cause is a virus. Wheezing in preschool children is usually caused by colds and viruses such as bronchiolitis. NHS guidance on bronchiolitis describes it as a common lung infection in young children that usually starts with cold-like symptoms before progressing to a cough, fast or noisy breathing and difficulty feeding.

Other triggers listed by Asthma and Lung UK include being very active, stress, pets, dust, pollution and pollen, with smoke from candles or cleaning sprays also capable of causing wheezing.

Is it asthma?

Usually not, and not yet. Asthma and Lung UK is explicit: an episode of wheezing can look like an asthma attack, but having a wheezing episode under the age of five does not always mean your child has asthma. There are many causes of wheezing in children, and most preschool children who wheeze do not go on to develop asthma.

The pattern that shifts the odds is wheezing outside infection. A wheeze is more likely to be asthma if your child has symptoms like coughing and wheezing even when they do not have a cough or cold. Symptoms that are worse at night or early in the morning, that recur after exercise or exposure to a known trigger, or that occur alongside eczema and food allergy in the child or asthma in the family, all raise the possibility.

Asthma is generally not diagnosed in very young children because the tests that confirm it need cooperation a baby cannot give, and because so many early wheezers grow out of it. NHS guidance on asthma notes that it is difficult to diagnose in young children.

What treatment looks like

Treatment decisions belong with a clinician, and this page does not give medicine amounts for any child. In practice a doctor may prescribe an inhaler with a spacer and mask to be given during episodes, and may ask you to keep a record of when the wheezing happens. If an inhaler is prescribed, ask to be shown the technique before you leave, because a spacer used incorrectly delivers very little.

Antibiotics do not treat viral wheeze. Cough medicines are not recommended for young children.

What you can do

Keep your baby away from tobacco smoke and vaping aerosol entirely, including on clothing and in the car, because it is the single most modifiable trigger. Keep feeds small and frequent during an episode, since a breathless baby tires before finishing a full feed. Keep them upright when awake and unsettled. Reduce exposure to known triggers where you can.

Australia's healthdirect service makes the same practical points and adds a reminder that repeated or persistent wheeze should always be reviewed rather than managed indefinitely at home.

What to record before the appointment

Clinicians assessing a wheezy baby want to know how often it happens, whether it only happens with colds, how long each episode lasts, whether anything reliably triggers it, whether there is eczema, food allergy or hay fever in your child, whether anyone in the family has asthma, and whether anyone smokes at home. A short written note of the last three episodes is more useful than trying to recall them in the room.