Ask around about RSV immunisation and you will get answers that flatly contradict each other. One parent had it done in the maternity hospital before they went home. Another was told to ring the GP. A third was not offered it at the four-month visit and wondered what they had missed.
They are all right. The route is decided by one thing only, and it is the date your baby was born. Everything else follows from that, and once you know which side of the line you are on, the question stops being confusing.
One correction first, because it changes a question a lot of parents are asking. This is not a vaccine. It is called nirsevimab, and it is an antibody. That distinction is not pedantry, and the section below explains why it matters for the routine childhood vaccines.
The short version
- Born 1 September 2026 to 28 February 2027
- Offered in the maternity hospital soon after birth
- Born 1 March 2026 to 31 August 2026
- Your GP practice provides it. You make the appointment
- Some high-risk babies under 24 months
- Talk to your paediatrician, who refers to the HSE vaccination team
- Cost
- Free
- What it is
- Nirsevimab, an antibody, not a vaccine
- How many
- One injection into the thigh, protecting through the first winter
- How long it lasts
- 5 months
- Alongside the routine vaccines
- The HSE says it does not interfere and can be given at the same time
Which route applies to your baby
The HSE is offering free RSV immunisation from 1 September to babies in two birth-date windows, and to some high-risk babies under 24 months. The windows do not just decide whether your baby is offered it. They decide where it happens and who arranges it, which is the part that generates all the contradictory advice.
Born between 1 September 2026 and 28 February 2027. A healthcare provider offers it in the maternity hospital soon after your baby is born. You do not arrange anything. If your baby is born at home during the RSV season, they are offered it in the maternity hospital. Talk to your midwife or obstetrician.
Born between 1 March 2026 and 31 August 2026. GPs are providing it for this group, and you make the appointment through your GP practice. Nobody rings you. This is the window where a baby quietly misses out, because it is the only one that needs a parent to act.
Some high-risk babies under 24 months. If your baby is high risk and under 24 months, talk to your paediatrician, who will refer your baby to the HSE vaccination team if it is right for them. The HSE gives as examples babies born before 30 weeks of pregnancy, and babies with a medical condition such as heart or lung disease or a weak immune system.
The HSE also says it is best to get the immunisation as early as possible in the RSV season, so that the protection covers the autumn and winter rather than starting halfway through it.
Which route is yours
Enter your baby's date of birth, or the date they are due, to see which of the three routes the HSE describes applies, and who arranges it.
This is one of the dates in your baby's first months. See my full plan →
This matches the date you type against the birth-date windows the HSE publishes for this season, on your device. It is not a booking, not an eligibility decision, and not medical advice. Whether the immunisation is right for your baby is a question for your midwife, GP or paediatrician, and the HSE decides who the programme covers. Always confirm on the HSE RSV immunisation page.
Why it is not a vaccine, and why that answers the question about the 2-month jabs
A vaccine works by stimulating the immune system to produce its own antibodies, which takes time. Nirsevimab does something different: it provides the antibodies directly. The HSE puts it plainly, that nirsevimab is an antibody and it is different from a vaccine.
Two practical things follow. First, it works straight away, so your baby is protected as soon as they are immunised rather than after a delay. Second, and this is the one parents keep asking about, the HSE says nirsevimab does not interfere with other childhood vaccines or medicines, and can be given at the same time as the routine childhood vaccines.
So the worry that it is "too much at once" alongside the two-month vaccines is answered directly by the HSE. That is not us reassuring you, it is the official position, and if you want to talk it through for your own baby the person to ask is your GP or public health nurse rather than a forum.
It is also why it does not appear on the childhood immunisation schedule. It is a separate seasonal programme with its own eligibility, running alongside the routine vaccines rather than inside them. For most babies born in the season it has already happened in hospital, weeks before the two-month appointment comes round.
If your baby was born between March and August, this one is yours to book. The maternity hospital route is automatic and the high-risk route goes through a paediatrician, but the middle group is the only one where nothing happens unless a parent rings the GP practice. It is also the group most likely to assume, reasonably, that it would have been offered at a routine appointment.
What the HSE says about how well it works
RSV is a common virus that causes chest infections in children and adults, and the risk of severe infection is highest in young babies. The HSE says that during the RSV season 1 in 2 babies gets RSV, that many need care from a GP or an emergency department, and that some need hospital treatment.
On the immunisation itself, the HSE states that nirsevimab is safe and that it prevents more than 80% of RSV hospitalisations, and that RSV immunisation is also recommended in other European countries, the USA and Australia.
The RSV season in Ireland usually runs from September to February, and one injection is intended to protect a baby through their first winter.
Side effects, and who it is not suitable for
We are not the right people to advise you on this, so this section is a plain summary of what the HSE publishes, and the questions belong with your midwife, GP or paediatrician.
The HSE says most babies who get nirsevimab have no side effects, and that fewer than 1 in 100 have mild ones: redness of the skin where the injection was given, a temperature, or a rash. Some babies may have an allergic reaction, serious allergic reactions are very rare, and your baby is monitored for 15 minutes afterwards.
On suitability, the HSE says most babies can have it, and that your baby may not be suitable if they have had a severe allergic reaction to any ingredient in the injection, or a serious hypersensitivity reaction to a previous immunisation with nirsevimab or palivizumab. A doctor or midwife may delay it if your baby is unwell.
If your baby has a side effect, it can be reported to the Health Products Regulatory Authority, or you can ask your GP or another healthcare professional to do it for you.
Who decides what
The HSE runs the programme and decides who it covers and when. The maternity hospital offers it to babies born inside the season, and your midwife or obstetrician is who to ask there. Your GP practice provides it to the earlier birth window, and the appointment is yours to make. A paediatrician refers high-risk babies to the HSE vaccination team. The Health Products Regulatory Authority takes reports of side effects.
We decide none of it, and we are not a clinical service. This guide sets out what the HSE publishes so you know which door to knock on, and whether anyone is going to knock on yours first.
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Official sources
- HSE: RSV immunisation for babies (every fact on this page: the two birth-date windows and their routes, the high-risk group, that it is free, that nirsevimab is an antibody and not a vaccine, the 5 months of protection, the single thigh injection, that it does not interfere with other childhood vaccines, the more than 80% figure, the side effects and the suitability conditions)
- HSE: RSV (respiratory syncytial virus) (what the virus is and the symptoms to watch for)
- HSE: Vaccines for your child (the routine childhood immunisation schedule, which this programme sits alongside rather than inside)
- Health Products Regulatory Authority: Report an issue (how a side effect is reported)
- gov.ie: Expanded RSV Immunisation Programme (the announcement of the national expansion. It describes an earlier season, so the dates on this page come from the HSE page above, not from here)
Facts checked against the official pages on 2 September 2026, when the HSE page was last reviewed on 14 August 2026. This is general information, not medical advice, and it does not decide whether the immunisation is suitable for your baby or whether your baby is eligible. The HSE runs the programme and makes those decisions; your midwife, GP or paediatrician is the person to ask about your own baby. Programme dates and eligibility are set by the HSE and change from season to season; always confirm on the official pages linked above.