Toddler Vaccinations and Boosters

The UK schedule changed in January 2026

If you had a first child a few years ago, the toddler part of the UK schedule you remember is no longer current. The UK Health Security Agency states that "significant changes have been made to the childhood schedule of immunisations starting 1 January 2026", and lists two in particular: "a new appointment at 18 months and the addition of the measles, mumps, rubella and varicella (MMRV) vaccine to the routine offer."

That is a structural change, not a tweak. There was previously no routine appointment between 12 to 13 months and 3 years 4 months, and now there is one.

What a UK toddler is offered now

Reading the schedule that applies from 1 January 2026, at 12 months a child is offered the pneumococcal vaccine (PCV), MMRV covering measles, mumps, rubella and varicella, and MenB.

At 18 months, children born on or after 1 July 2024 are offered DTaP/IPV/Hib/HepB and a second dose of MMRV. Children born on or before 30 June 2024 have no appointment scheduled at 18 months.

At 3 years 4 months, children born on or after 1 January 2025 are offered the pre-school booster against diphtheria, tetanus, pertussis and polio. Children born on or before 31 December 2024 get that booster plus MMRV at the same visit.

The logic behind the reshuffle is set out in the MMRV programme material: the second measles dose has been brought forward from 3 years 4 months to the new 18-month appointment, so that children are protected against measles, mumps, rubella and chickenpox earlier. Children born on or after 1 September 2022 are offered one or two doses of MMRV as part of routine vaccination, and a single catch-up dose is planned for children born between 1 January 2020 and 31 August 2022 who have not already had chickenpox or been vaccinated against it.

Because eligibility is split by date of birth in three different places, the practical advice is to check your own child's birth date against the published schedule rather than relying on what a friend's child was offered.

Ireland runs two schedules at once

The HSE's schedule is genuinely different, and it is also split by date of birth. For children born before 1 October 2024, 12 months brings MMR and MenB, 13 months brings the Hib/MenC combined vaccine and PCV, and at 4 to 5 years in junior infants children get the 4-in-1 vaccine and MMR.

For children born on or after 1 October 2024, 12 months brings MMR, MenB and the chickenpox (varicella) vaccine; 13 months brings a fourth dose of the 6-in-1 vaccine, MenC and PCV; and junior infants brings the 4-in-1 and the combined MMRV vaccine.

So both the UK and Ireland have added routine chickenpox protection, and both have done it with different vaccines at different ages. There is no single "toddler schedule" that covers even two neighbouring countries.

The United States is different again

The CDC's schedule for young children includes vaccines that are not routine in the UK or Ireland, including hepatitis A, and gives varicella as a standalone vaccine at 12 to 15 months followed by a second dose at 4 to 6 years. Annual influenza vaccination is part of the routine US offer for children from 6 months. If you are moving between countries, expect a catch-up conversation rather than a straight transfer.

Why the pre-school booster matters even though it feels far off

The pre-school booster is the one most often missed, because it falls outside the intense first two years and often lands during a house move, a nursery change or a new sibling. Protection from the earlier doses wanes, and pertussis in particular circulates in older children and adults who then pass it to babies too young to be fully protected. Uptake at this visit is a public health issue as much as an individual one.

Practical points that make the appointments easier

Bring the red book or equivalent record, and bring it every time; a written record travels between practices and countries better than a memory does. Feed your child before you go, dress them in short sleeves or loose trousers depending on where the injection goes, and bring one familiar comfort item. Holding a toddler chest to chest with the arm or thigh exposed is easier for everyone than trying to keep them still on a couch.

A mild fever, a sore leg or arm, and a grumpy day or two afterwards are common. If your child has a minor cold without a fever, the appointment normally goes ahead; if they are genuinely unwell with a temperature, phone the surgery rather than simply not turning up, so the visit gets rebooked.

If you are behind

Being behind is common and is not a closed door. The NHS's position is that you can still catch up on most vaccines if you miss them, though it is best to have them on time. Practices run catch-up schedules routinely, and a child who arrives in the country partway through will be assessed against the local schedule rather than being expected to start again.

Premature babies are vaccinated according to their actual birth date rather than their corrected age, which surprises many parents. If your child was born early, raise it at the appointment rather than delaying it.

Where to check, and what to ignore

The authoritative source for the UK is the published UKHSA schedule and the NHS vaccination pages; for Ireland it is the HSE's own schedule; for the US it is the CDC's. Those change, sometimes substantially, as the January 2026 UK revision shows. An article, a leaflet from a previous pregnancy or a social media summary can be a year or more out of date, and in this case being a year out of date means missing an appointment that did not previously exist.

If you have questions about a specific vaccine, the practice nurse who gives it is generally the best-informed person you will speak to about it, and asking is expected rather than awkward.