Infections

RSV in children: watch how your child breathes, do not count the coughs

Updated: 2026-10-15 6 min read
RSV in children: watch how your child breathes, do not count the coughs

Key takeaways

  • What decides things in this illness is HOW the child breathes, not the coughing. According to CDC, in very young babies the only symptom may be irritability, reduced activity and difficulty breathing.
  • According to CDC, two to three in every hundred babies under three months old are admitted to hospital with RSV each year. The younger the child, the higher the risk of severe illness.
  • The signs of laboured breathing, according to MedlinePlus: the muscles around the ribs drawing in with each breath in, the nostrils flaring with each breath, fast breathing, and blue skin or lips.
  • According to CDC, many children with RSV have NO fever. A fever that has gone while the breathing has got heavier means worse, not better.
  • According to NHS, bronchiolitis has no specific treatment and usually clears up at home — but in some children it is severe and has to be treated in hospital.

The most important thing first. According to CDC, RSV usually causes only mild, cold-like symptoms and most cases clear up by themselves; but in young children it can turn into bronchiolitis or pneumonia, and two to three in every hundred babies under three months old are admitted to hospital with RSV each year. What to follow is how your child BREATHES and whether they can still feed.

Recognising it: look at the breathing, do not count the coughs

According to CDC, symptoms usually appear four to six days after infection: a runny nose, a blocked nose, poor appetite, coughing, sneezing, fever, wheezing — and these symptoms usually arrive in stages rather than all at once. A baby who today has nothing more than a runny nose can still be struggling to breathe on day three or four.

  • THE YOUNGER THE CHILD, THE FEWER CLEAR SIGNS. According to CDC, in very young babies the only symptom may be irritability, reduced activity and difficulty breathing.
  • According to CDC, in babies under six months the signs may include irritability, reduced activity, taking less food and drink, and pauses in breathing — a gap lasting more than ten seconds. CDC also says that many children with RSV have no fever.
  • LABOURED BREATHING, according to MedlinePlus: the muscles around the ribs drawing in with each breath the child takes in, the nostrils flaring with each breath, fast breathing, and skin or lips turning blue from lack of oxygen.
  • According to NHS, bronchiolitis from RSV makes a child breathe faster, breathe with a wheezing or rattling sound, and feed or eat with difficulty; it is usually at its worst around day three to day five.

Easily confused with other illnesses

  • Whooping cough also gives young babies pauses in breathing with almost no coughing — there is a separate article on whooping cough on this site.
  • Influenza A, influenza B and pneumonia all have their own articles on this site; for the cough itself, see the articles on a dry cough and a cough with phlegm.
  • Fever is not the measure in this illness. A child whose fever has gone while the breathing has got heavier is worse.

What to do straight away

  • COUNT THE BREATHS while your child is settled or asleep, and look at the belly below the ribs to see whether it draws in. Write it down by the hour: getting faster means getting worse.
  • According to NHS, keep your child upright as much as possible while they are awake, and give them plenty to drink.
  • Feed or give food in small amounts more often — a child who is struggling to breathe can only take a little at a time. Count the wet nappies each day and write it down.
  • According to NHS, if your child is uncomfortable or fretful you can use children's paracetamol (acetaminophen) for a child over two months old, or ibuprofen for a child over three months old. The dose is for a doctor or pharmacist to decide.
  • Note the time your child started breathing fast, and tell whoever examines them whether the child was preterm or full term.

What you must NOT do

  • Do NOT wait to see whether the coughing increases. In this illness what changes the decision is the breathing, not the cough.
  • According to NHS, do NOT smoke around your child.
  • According to NHS, do NOT try to bring a fever down by sponging your child with cool water or taking all their clothes off.
  • According to NHS, do NOT give aspirin to a child under 16.
  • Do NOT buy antibiotics yourself: according to NHS, bronchiolitis has no specific treatment and usually clears up by itself, and antibiotics do not kill viruses. There is a separate article on antibiotics on this site.
  • Do NOT let anyone with a cold or a cough hold your child or kiss their face. According to CDC, kissing the face of a child who has RSV is one route of transmission.

Which children become more severely ill

According to CDC, the children at highest risk of severe illness are: the younger the child the higher the risk, children born preterm, children with chronic lung disease or heart disease, children with a weakened immune system, and children with neuromuscular conditions that make swallowing or clearing secretions difficult. If your child is in this group, your threshold for phoning should be lower. According to CDC, call the doctor if your child is having difficulty breathing, is not drinking enough, or the symptoms are getting worse.

When you must go to hospital

GO TO EMERGENCY CARE or call 115 (the emergency number in Vietnam) NOW — do not wait until morning — if your child has ANY of the following; according to NHS and MedlinePlus this group belongs at emergency level: your child is having difficulty breathing; there are pauses in your child's breathing; the skin, tongue or lips turn blue, grey or dusky; your child has to work to breathe at all — the muscles around the ribs drawing in, the nostrils flaring, breathing very fast; your child is clearly exhausted, drowsy, hard to rouse when called; your child cannot feed at all. — BE SEEN THE SAME DAY, do not wait until tomorrow, if: your child's cold is getting steadily worse; your child is feeding or eating markedly less than usual; your child has had no wet nappy for half a day or more; your child is under six months, was born preterm, or has underlying heart or lung disease and has started breathing fast. — If you are unsure, phone and ask before deciding for yourself.

This is an illness in which a young child who becomes severely ill has to go into hospital: according to CDC, children admitted may need oxygen, fluids by drip when they cannot eat or drink, and mechanical ventilation. None of that can be done at home instead. Y Te Xanh does NOT take on home care for infants and newborns, and is not a substitute for your child's paediatric appointment.

There are two things we can do: a remote consultation by video call so you can decide whether to go in now or wait for the appointment, and a doctor coming to the house to take the history, examine, and say clearly which cases must be admitted. With a sign from the box above, go in first and call afterwards.

The symptoms, the signs in babies under six months, the risk groups, the routes of transmission and the in-hospital treatment above follow the public material of CDC in the United States on RSV. The bronchiolitis section, the worst-day mark and what to do and not to do at home follow NHS; the signs of laboured breathing follow MedlinePlus. This article passes that on and does not replace being examined. Citing CDC here does not imply that CDC endorses Y Te Xanh or our services.

Need personalised advice for your loved one? Call our hotline 094 368 81 15 (24/7) — calling to ask a question or to book costs nothing. GreenCare has doctors who come to examine, nurses who carry out doctor's orders (injections, infusions, dressing changes), remote consultation by video call, and a review of the medicines you are taking; an in-depth remote consultation, or any one after the first, is a paid service. For children we take examination and acute care only — not long-term care at home, and not newborns or expectant mothers. We confirm we have staff in your area and provide transparent pricing before we begin.

Sources

Frequently asked questions

How do I know whether my child is really struggling to breathe, or just has a blocked nose?
Take your child's top off, wait until they are settled or asleep, then look at the chest and at the belly below the ribs. A blocked nose usually just makes the breathing noisier, with feeding that stops and starts again. Struggling to breathe means the whole body is working at it: according to MedlinePlus, the muscles around the ribs draw in with each breath in, the nostrils flare, the breathing is fast, and the skin or lips may turn blue. According to CDC, in very young babies the only symptom may be irritability, reduced activity and difficulty breathing — so do not wait for the coughing to increase. If you see any of the signs in the red-flag box, go now; do not sit there taking more measurements.
Is there a specific medicine for RSV, and are antibiotics needed?
According to NHS, bronchiolitis has no specific treatment: it usually clears up by itself and you can look after your child at home, but in some children it is severe and has to be treated in hospital. Antibiotics do not kill viruses, so do not buy them yourself. If a doctor does prescribe something, that is the doctor's decision after an examination, for a different reason. The most useful things you can do at home are keeping your child drinking enough, feeding small amounts often, keeping them upright while awake, and watching the breathing closely.
Is there an RSV immunisation for children?
There is, and it is a medical decision rather than something to arrange at home. According to CDC, there are two ways of protecting a child against severe RSV: an RSV vaccine given to the mother during pregnancy, or an RSV antibody given to the baby after birth. Which applies to your child, which route to use and when are matters for an obstetrician or a paediatrician working to the immunisation schedule in Vietnam — ask directly where your pregnancy is being followed or where your child is immunised. We do not set out doses or specific products here.
An older sibling has come home from school with a cough. How do we keep the baby from catching it?
According to CDC, RSV spreads when someone infected coughs or sneezes near you, when droplets get into your eyes, nose or mouth, through direct contact such as kissing the face of a child who has RSV, and when you touch a contaminated surface and then touch your face before washing your hands. CDC also says the virus survives for hours on hard surfaces such as a table top or the side of a cot. What you can do: cover coughs, wash hands often, wipe frequently touched surfaces, open windows for fresh air, and keep anyone who is ill apart. According to CDC, people with RSV are usually contagious for three to eight days and may be contagious a day or two before any sign of illness; some young children and people with weakened immune systems can remain contagious for four weeks or more, even after the symptoms have gone.

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