RSV in young children: warning signs and how to prevent it
What RSV is, the symptoms parents should watch for, the season in Thailand, and prevention through vaccination in pregnancy and antibody protection for infants.
RSV is a virus that causes lower respiratory tract infection and is common in young children. It starts like an ordinary cold, which lulls many parents, but in some small children it progresses to bronchiolitis or pneumonia and hospital admission.
Key takeaways
- RSV season in Thailand usually runs from June to October.
- The signs to watch for are fast breathing, breathlessness, wheezing, poor feeding and drowsiness.
- RSV is a virus, so antibiotics don't help; care is supportive.
- Two ways to prevent it: vaccination in pregnancy, and ready-made antibodies given to the child.
Symptoms parents should watch for
- Fever, cough and a runny nose, hard to tell from a cold at first
- Breathing faster than usual, or so hard that the ribs draw in
- Breathlessness, wheezing when breathing
- Clearly feeding or eating less
- Drowsiness, unusual fussiness, or hard to wake
Good to know: If your child is breathing unusually fast, the ribs are drawing in, the lips or fingertips look blue, they are very drowsy or can't feed at all, go to a hospital immediately.
Who is at risk of severe illness
Young infants, especially in the first year, are at highest risk because their airways are small and their immune system is still developing.
Children with certain conditions, such as some chronic lung or heart diseases or weakened immunity, are at higher risk than other children and are usually the group doctors consider for special protection.
How to prevent it
There are two main approaches. The first is vaccinating the mother at about 24–36 weeks of pregnancy so antibodies pass to the baby from birth.
The second is giving ready-made antibodies directly to the child: a long-acting antibody for infants and young children, especially those who are very young or have a chronic condition. Both need a doctor's assessment.
Caring for your child at home
- Offer water or milk often in small amounts to prevent dehydration
- Rinse or suction the nose as the doctor advises to make breathing easier
- Give fever medicine by weight as advised; don't use antibiotics on your own
- Keep away from cigarette smoke and crowded places while the child is ill
- Separate personal items and wash hands often to reduce spread at home
Frequently asked questions
They look very similar at first, but RSV is more likely to reach the small airways and lungs, so breathing must be watched especially closely in young children.
Related services
Sources
- Respiratory Syncytial Virus Infections MedlinePlus, U.S. National Library of Medicine
- Respiratory syncytial virus (RSV) World Health Organization
This content is general information and does not replace an examination, diagnosis or personal advice from a doctor. Published 6 August 2026
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