Flu Shot for Kids 2026–27: Who Needs It, How Many Doses & Side Effects

Quick answer: The American Academy of Pediatrics (AAP) recommends a flu vaccine every year for all children 6 months and older who don’t have a medical reason to skip it. Children 6 months through 8 years who are getting a flu vaccine for the first time, or who have had only one dose ever before July 1, 2026, need two doses at least 4 weeks apart. Everyone else needs one dose. Aim to finish vaccination by the end of October, before flu season picks up.

Why the flu shot matters this year

The 2025–2026 flu season was a severe one for children. According to the AAP, about 190 children in the U.S. died from flu, and roughly 85% of them were unvaccinated. Yet only about half of children ages 6 months to 17 years got a flu vaccine last season.

A study by CDC experts found that flu vaccination lowers a child’s risk of dying from flu by about 80%. It also cuts down on doctor visits, hospital stays, and missed school and work days.

What’s new for 2026–2027

Updated strains: All three virus strains in this year’s vaccines were updated, including protection against the H3N2 “subclade K” strain that spread widely last season.
All vaccines are trivalent: Every flu vaccine available in the U.S. this season protects against three strains. The AAP doesn’t prefer one age-appropriate brand or type over another, so the best vaccine is the one your child can get soonest.
Who’s making recommendations: The CDC has not released new flu vaccine recommendations for this season, and changes to the federal childhood schedule have created confusion for many families. The AAP and other medical societies have issued their own evidence-based recommendations. Your pediatrician can walk you through what’s right for your child.

How many doses does my child need?

Under 6 months: Too young for the flu vaccine. The best protection is for parents, siblings, and caregivers to get vaccinated. Getting a flu shot during pregnancy also passes protection to the baby.
6 months through 8 years, first time or unsure: Two doses, at least 4 weeks apart. This applies if your child has never had a flu vaccine, has had only one dose ever before July 1, 2026, or you don’t know their history. Start as soon as vaccine is available so both doses are done by the end of October.
6 months through 8 years, 2 or more doses in the past: One dose.
9 years and older: One dose.

Shot or nasal spray?

Most children get a flu shot. A nasal spray flu vaccine is also an option for many healthy children 2 years and older. It isn’t recommended for children with certain conditions, such as a weakened immune system, and your pediatrician can tell you if it’s a good fit. Both options protect against flu.

Common side effects

Most side effects are mild and go away within a day or two:

Soreness, redness, or swelling where the shot was given
Low-grade fever
Muscle aches or feeling tired
Runny nose or mild congestion after the nasal spray

The flu vaccine can’t give your child the flu. Serious allergic reactions are rare, and clinics are prepared to treat them. Tell your pediatrician if your child has had a seizure with fever before, or a severe reaction to a past flu vaccine.

Can my child get the flu shot with other vaccines?

Yes. The AAP supports giving the flu vaccine at the same visit as other vaccines, including COVID-19 vaccines. Combining shots means fewer trips to the doctor.

Where to get it

Your pediatrician’s office is the best place, since they can check your child’s vaccine history and give any other vaccines at the same time. Many pharmacies also vaccinate older children, but age rules vary by state. The Vaccines for Children (VFC) program provides vaccines at no cost for eligible children.

If your child gets the flu anyway

Call your pediatrician early if your child has flu symptoms, especially if they’re under 5 or have a condition like asthma. Antiviral medicine works best when started within the first two days, and it’s recommended for children at higher risk of complications. See our guide to cold vs. flu vs. RSV vs. COVID for warning signs.

Frequently Asked Questions

What age can babies get the flu shot?

Babies can get the flu vaccine starting at 6 months old. Babies younger than 6 months are protected when their parents and caregivers get vaccinated and when their mother gets a flu shot during pregnancy.

Why do some kids need two flu shots?

Children 6 months through 8 years who are getting a flu vaccine for the first time, or who have had only one dose ever, need two doses at least 4 weeks apart. The first dose primes the immune system and the second builds full protection.

When should my child get the flu vaccine?

As soon as it’s available, ideally by the end of October. Children who need two doses should start early so both are done in time. Getting vaccinated later in the season still helps.

Can the flu shot give my child the flu?

No. Flu shots don’t contain live virus and can’t cause flu. Some children have mild side effects like a sore arm, low fever, or aches for a day or two.

Can my child get the flu shot and COVID vaccine at the same time?

Yes. The AAP supports giving the flu vaccine at the same visit as other vaccines, including COVID-19 vaccines.

Related guides

Sources

This article is for general information and is not a substitute for advice from your child’s doctor.

Flu Shot for Kids 2026–27: Who Needs It, How Many Doses, and Side Effects