Flu Shots for Kids: When to Vaccinate, Who Needs Two Doses, and What to Expect
Every fall, parents ask the same question: does my child really need a flu shot this year? The short answer is yes, for nearly every child six months of age and older. Influenza is not just a bad cold. It can cause high fevers, days of missed school, and in some children serious complications that lead to hospital stays. This guide explains when to get your child vaccinated, which children need two doses, what the vaccine options are, and what to expect afterward.
Who Should Get a Flu Vaccine?
The American Academy of Pediatrics and the CDC recommend an annual flu vaccine for all children six months and older who do not have a medical reason to avoid it. Babies under six months are too young to be vaccinated, which is why it matters that parents, siblings, grandparents, and other caregivers are vaccinated too. Protecting the people around a young infant is one of the best ways to protect the infant.
Children with asthma, diabetes, heart conditions, or weakened immune systems are at higher risk of flu complications, so for these children the vaccine is especially important. If your child has a chronic condition, ask your pediatrician about the best timing and product for them.
When Is the Best Time to Get the Flu Shot?
Flu vaccines are usually available beginning in late summer or early fall, and the general advice is to vaccinate by the end of October. Protection builds over about two weeks after the shot, so getting it before flu begins spreading in your community gives your child a head start. In the New River Valley, flu activity commonly picks up in late fall and winter, but timing varies from year to year.
If October has already passed, do not skip it. Vaccination later in the season is still worthwhile, because flu can circulate well into the spring. The best time to get the flu shot is the first time you can, and the second best time is today.
Which Children Need Two Doses?
Children from six months through eight years old who have never received a flu vaccine, or who have not had at least two doses in total before July 1 of the current season, need two doses given at least four weeks apart. The second dose matters because a young child's immune system needs the first dose to prime it and the second to build full protection. Children nine years and older need just one dose each season.
Because this depends on your child's vaccine history, the easiest approach is to ask at your next visit. We can check your child's record and tell you whether one dose or two is needed this season. You can also see where flu fits among other routine vaccines in our complete children's vaccine schedule by age.
Flu Shot vs. Nasal Spray
There are two main types of flu vaccine for children. The injectable flu shot is approved for children six months and older. The nasal spray vaccine is a live, weakened vaccine approved for healthy children and adults from age two up to age 49. Either one is a good option when it is appropriate for your child, and the most important thing is that your child gets vaccinated rather than which type they receive.
The nasal spray is not recommended for everyone. It is generally avoided in children with certain conditions, including some children with asthma or wheezing, a weakened immune system, or certain other health issues. Your pediatrician can help you choose the right option.
Common Myths About the Flu Vaccine
Myth: The flu shot can give my child the flu. The injectable vaccine contains inactivated virus or a single viral protein, so it cannot cause influenza. Some children feel run down for a day afterward as the immune system responds, which is a sign the vaccine is doing its job.
Myth: My child is healthy, so they do not need it. Healthy children can get severe flu too. Vaccination lowers the chance of getting sick and often makes the illness milder when a vaccinated child does catch it.
Myth: My child is allergic to eggs, so they cannot be vaccinated. Current guidance says children with an egg allergy can receive a flu vaccine. If your child has had a serious allergic reaction to a vaccine or its ingredients in the past, talk with your pediatrician first.
Myth: Last year's shot still protects my child. Flu viruses change from year to year, and the vaccine is updated to match, so a new dose is needed every season.
What to Expect After the Flu Shot
Most children have only mild effects. Soreness, redness, or swelling where the shot was given is the most common reaction, and some children have a low-grade fever, tiredness, or muscle aches for a day or two. A cool cloth on the arm and extra cuddles usually help. Serious reactions are rare. If you notice hives, swelling of the face or throat, trouble breathing, or your child seems very unwell after a vaccine, seek emergency care right away.
A fever after vaccination is usually mild, but if you are unsure what to do with a temperature, our guide to fever in children and when to call the pediatrician explains what is normal and what is not. Parents of infants can also read about what to expect at the 2-month checkup and vaccines.
Flu Symptoms and When to Call
Flu tends to come on suddenly. Typical signs include fever, chills, cough, sore throat, body aches, headache, and fatigue, and younger children may also have vomiting or diarrhea. Keep a sick child at home, offer plenty of fluids, and let them rest. Call your pediatrician promptly if your child has trouble breathing, seems dehydrated, is unusually sleepy or hard to wake, has symptoms that improve and then return with a worse fever and cough, or is a baby under three months with any fever.
If your child is sick and you need to be seen quickly, same-day sick child visits are available for concerns that should not wait, and our guide to pediatric urgent care vs. the ER can help you decide where to go after hours. Early evaluation matters because some children may be candidates for antiviral treatment, which works best when started soon after symptoms begin, and only a clinician can decide whether it is appropriate.
Simple Ways to Reduce the Spread of Flu
The vaccine is the most effective tool, but daily habits add protection. Teach children to wash their hands with soap and water, cough or sneeze into an elbow, and avoid sharing cups and utensils. Keep children home until they have been fever-free for at least 24 hours without fever-reducing medicine. Fresh air, enough sleep, and balanced meals support overall health, although none of these replaces vaccination.
Frequently Asked Questions
At what age can my child get a flu shot?
Children can receive the flu vaccine starting at six months of age. Babies younger than six months cannot be vaccinated, so the people who care for them should be.
Does my child need two flu shots?
Children six months through eight years old who have not previously received at least two flu vaccine doses need two doses this season, spaced at least four weeks apart. Children nine and older need one dose.
Can my child get the flu shot and other vaccines at the same visit?
Yes. The flu vaccine can be given at the same visit as other routine childhood vaccines, which helps families avoid extra trips to the office.
Can my child get the flu shot if they have a mild cold?
Children with a minor illness, such as a mild cold without fever, can usually be vaccinated. If your child has a moderate or severe illness, your pediatrician may suggest waiting until they feel better.
How long does flu vaccine protection last?
Protection builds over about two weeks and lasts through the flu season, but it can decline over time, so a new vaccine is recommended every year.
Schedule Your Child's Flu Vaccine
Staying on top of vaccines is one of the simplest ways to keep your child healthy through the school year. As a pediatrician in Christiansburg, VA, our team can review your child's immunization history and answer your questions. Contact our office to confirm current flu vaccine availability and to request an appointment. This article is for general education and does not replace medical advice for your child's individual needs.
Medically Reviewed By
Dr. Rahul Pandey is a board-certified pediatrician with fellowship training in pediatric critical care. He completed his pediatrics residency at New York Medical College and a critical care fellowship at the University of Florida, and serves as an Associate Professor at both Edward Via College of Osteopathic Medicine and Virginia Tech Carilion School of Medicine.