Quick read
Key points
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RSV (respiratory syncytial virus) is a very common virus that infects the lungs and airways. In older children and adults, it usually causes cold-like symptoms, but in young babies — especially those under 6 months, born prematurely, or with certain health conditions — it can cause bronchiolitis and, sometimes, more serious illness needing hospital care.
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Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
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Your baby is feeding less than half their usual amount
01 · Know
What is RSV (Respiratory Syncytial Virus)?
RSV (respiratory syncytial virus) is a very common virus that infects the lungs and airways. In older children and adults, it usually causes cold-like symptoms, but in young babies — especially those under 6 months, born prematurely, or with certain health conditions — it can cause bronchiolitis and, sometimes, more serious illness needing hospital care.
RSV spreads easily through coughing, sneezing, and contact with contaminated surfaces, and tends to circulate widely each autumn and winter. Most babies who catch RSV recover well with supportive care at home.
02 · Understand
Clinical context
Immunisation now offers strong protection
A new immunisation (nirsevimab) is now offered to newborns and young babies in Ireland to protect against severe RSV illness — see the RSV immunisation article for details on eligibility.
03 · Act
When to Contact a Doctor (Non-Emergency)
- 1Your baby is feeding less than half their usual amount
- 2Symptoms are not improving after a week
- 3Your baby was born prematurely or has an underlying health condition and develops cold-like symptoms
- 4You're simply worried about how your baby seems
04 · Prevent & manage
Practical steps
Most RSV Infections Are Managed at Home
While RSV can be serious in young or vulnerable babies, most infections in otherwise healthy babies are mild and manageable with supportive care.
- 1Offer smaller, more frequent feeds.Babies with RSV often tire quickly during feeds, so smaller, more frequent amounts can help.
- 2Use saline nasal drops for a blocked nose.This can make feeding and breathing more comfortable.
- 3Keep your baby upright when possible.This can ease breathing, especially if the nose is congested.
- 4Monitor wet nappies and feeding closely.These are good indicators of how your baby is coping.
- 5Ask about the RSV immunisation for future protection.This is now offered as part of routine newborn care in Ireland.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: RSV (respiratory syncytial virus) ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
RSV is very common and usually causes mild illness, though it can be more serious in young or vulnerable babies.
Rapid breathing, pauses in breathing, or a blue tinge to the skin are signs to seek emergency care immediately.