Flu Season and Kids: Vaccines, Symptoms, Emergency Warning Signs and When to Stay Home • Living Life as Moms | Mom Hacks, Toddler Snacks, and Kids Activities

Quick answer: the CDC recommends a yearly flu vaccine for everyone aged 6 months and older, and children 6 months through 8 years who have not had at least two flu shots before need two doses this season, given at least four weeks apart. Flu symptoms usually come on suddenly with fever, cough, sore throat, body aches, headache and fatigue. Get emergency care for fast or hard breathing, bluish lips, chest pain, being unable to drink, not waking up or not interacting, or a fever with a rash. Children should stay home until they have been fever-free for at least 24 hours without fever-reducing medicine.

Flu season arrives every fall and winter, and it hits children hard. Kids catch germs at school and daycare, share toys and rarely cover their coughs, so the virus travels quickly from classroom to kitchen table. Most children recover at home, but flu can cause serious illness, especially in babies and young children.

This guide explains how flu differs from a cold, what the CDC recommends for vaccines, how to recognize emergency warning signs and how to care for a sick child. It is part of our family health and safety guide and works with our guides on when to keep your child home from school and how much sleep kids need.

Sources: Centers for Disease Control and Prevention (CDC) influenza pages for families and children, including flu vaccine recommendations, emergency warning signs, antiviral treatment and “Take 3” actions; American Academy of Pediatrics HealthyChildren.org flu guidance. Recommendations change each season, so check CDC.gov and talk to your pediatrician for the current year. Checked November 2026. This article is general health information, not medical advice.

Flu or Cold? How to Tell

Colds and flu are both respiratory viruses, and they share some symptoms. The CDC notes that flu is usually worse and comes on more suddenly.

Flu usually brings:

Fever, although not everyone has one
Cough and sore throat
Muscle or body aches
Headache
Chills and tiredness
Runny or stuffy nose
Vomiting and diarrhea, which are more common in children than adults

A cold usually brings a runny or stuffy nose, sneezing and a milder cough, often without much fever. Because symptoms overlap with COVID-19 and other viruses, only a test can tell for sure. Your pediatrician can advise whether to test.

Why Flu Matters for Kids

The CDC states that young children, especially those under 5 and particularly under 2, are at higher risk of serious flu complications such as pneumonia, dehydration and worsening of asthma. Children with long-term conditions such as asthma, diabetes or heart disease are also more vulnerable. Every season, thousands of children are hospitalized with flu, and some die, and many of those children were not vaccinated.

The Flu Vaccine

The CDC recommends a flu vaccine every year for everyone 6 months and older, with rare exceptions. A yearly vaccine is needed because flu viruses change and protection fades over time.

How many doses

Children from 6 months through 8 years old need two doses, given at least four weeks apart, if they have not previously received at least two doses of flu vaccine. Children who have had two or more doses before need one dose each season. Ask your pediatrician which applies to your child.

Timing

Many families aim to get vaccinated by the end of October, but getting the shot later is still worthwhile. Flu activity often lasts into the spring, so it is rarely too late while the virus is circulating. Because children need at least two weeks after vaccination to build full protection, earlier is better.

Babies under 6 months

Infants cannot be vaccinated until 6 months. The CDC recommends that everyone around the baby gets vaccinated, including parents, siblings and caregivers. Pregnant people are also advised to get a flu shot, which can help protect the baby after birth, according to CDC guidance.

Types of vaccine

Flu vaccines come as injections, and a nasal spray is approved for some healthy children and adults in specific age ranges. Your provider will recommend what suits your child. Mild side effects such as a sore arm, low fever or tiredness are common, and the vaccine cannot cause the flu.

Everyday Habits That Help

The CDC suggests “Take 3” steps: get vaccinated, take everyday precautions and take antiviral drugs when prescribed.

Wash hands often with soap and water for at least 20 seconds, especially before eating and after coughing, sneezing or using the bathroom. Use hand sanitizer when sinks are not available.
Cover coughs and sneezes with a tissue or the inside of the elbow.
Avoid touching eyes, nose and mouth.
Clean frequently touched surfaces such as doorknobs, tablets and toys.
Stay away from sick people when possible.
Keep your child home when sick to avoid spreading it.
Support healthy habits. Good sleep, balanced meals and physical activity help the body cope with illness. Check our guide to how much sleep kids need for age-based targets.

Caring for a Sick Child at Home

Most children with flu recover in about a week with rest and fluids.

Offer fluids often. Water, milk, oral rehydration solution and broth help prevent dehydration. Small sips are helpful for a child with nausea.
Let them rest. Quiet play and sleep are best.
Treat discomfort. Ask your pediatrician about fever and pain medicines and the correct doses for your child’s age and weight. Do not give aspirin to children and teens with flu-like illness, since it is linked to a rare, serious condition called Reye syndrome. Do not give over-the-counter cough and cold medicines to young children unless your doctor says to.
Keep the air comfortable. A cool-mist humidifier may ease congestion if you clean it daily.
Monitor. Watch for signs that the illness is worsening.

Store medicines safely out of reach, as explained in our poison prevention guide, and measure doses with the tool that comes with the medicine.

Antiviral Medicine

Prescription antiviral drugs can shorten flu and lower the chance of serious complications. According to the CDC, they work best when started within two days of symptoms, but they can still help later for people who are very sick or at high risk. Call your pediatrician early if your child has flu symptoms, especially if the child is under 5 or has a health condition. A doctor will decide if medication is appropriate.

Emergency Warning Signs in Children

The CDC lists these signs as reasons to seek emergency medical care for a child with flu:

Fast breathing or trouble breathing
Bluish lips or face
Ribs pulling in with each breath
Chest pain
Muscle pain so severe the child refuses to walk
Dehydration, such as no urine for 8 hours, dry mouth and no tears when crying
Not alert or interacting when awake
Seizures
Fever above 104°F
Fever or cough that improves but then returns or worsens
Worsening of chronic medical conditions

In babies, the CDC adds being unable to eat, having no tears when crying and significantly fewer wet diapers than normal. Any fever in an infant younger than 3 months is a reason to call the doctor right away. Trust your instincts, and if your child looks very ill, call 911 or go to the emergency department.

Flu, COVID-19 and RSV: A Crowded Season

Several respiratory viruses circulate at the same time in fall and winter, including flu, COVID-19 and respiratory syncytial virus (RSV). They can look alike, with cough, fever and congestion, and children may have more than one infection in a season.

Testing helps. Ask your pediatrician about testing, especially if your child is young, has a health condition or has trouble breathing, since some illnesses have specific treatments.
Prevention overlaps. Handwashing, staying home when sick, covering coughs and keeping the home well ventilated help against all of them.
Ask about other vaccines and protection. Talk to your child’s doctor about what is recommended for your child’s age this season, because guidance for COVID-19 and RSV protection changes. The CDC website lists current recommendations.
Watch the babies. Infants can become very ill with respiratory viruses. Trouble feeding, fast breathing or fewer wet diapers should prompt a call to the doctor.

Kids With Asthma or Other Conditions

Flu can trigger asthma attacks and complicate conditions such as diabetes and heart disease.

Keep asthma action plans up to date and rescue inhalers handy.
Make sure the vaccine is up to date, since children with chronic conditions are at higher risk.
Call your doctor at the first sign of flu, since antiviral medicine is often recommended for high-risk children.
Tell the school nurse or daycare about any medications or plans.

Sick-Day Supply Kit

Prepare before everyone is ill and nobody wants to go to the store.

A reliable thermometer with fresh batteries
Children’s fever and pain relievers recommended by your pediatrician, with a dosing syringe
Oral rehydration solution and easy foods such as crackers, applesauce and broth
Tissues, a nasal saline spray or drops and a bulb syringe for babies
Extra thermos or water bottles to keep fluids close
A cool-mist humidifier, if your doctor approves
Hand soap, sanitizer and disinfecting wipes
A list of phone numbers for your pediatrician and Poison Control (1-800-222-1222)

Keeping the Rest of the Household Healthy

When one child is sick, the next question is how to protect everyone else.

Give the sick child their own cup, towel and utensils, or wash items thoroughly between users.
Open windows for a few minutes when weather allows, to improve air flow.
Wash bedding and clothes in warm water, and wash hands after handling them.
Have one adult be the main caregiver if possible.
Wipe down shared surfaces such as door handles, remotes and faucets daily.
Remind siblings to wash hands after spending time with the sick child.

Helping a Sick Child Feel Better

A sick child needs comfort as much as medicine.

Set up a cozy spot on the couch with blankets and a bucket nearby for nausea.
Offer quiet activities such as audiobooks, coloring, puzzles or a favorite show in moderation. Our guide to screen time by age can help set sensible limits once they feel better.
Offer popsicles or small sips if appetite is low.
Do not worry if your child eats less for a few days, as long as fluids continue.
Return to normal routines gradually, since tiredness often lingers after the fever breaks.

When to Return to School

The CDC advises that children stay home until they have been fever-free for at least 24 hours without the use of fever-reducing medicines. Your school or daycare may have extra rules. Read more in our guide on when to keep your child home.

Once your child returns, remind them to wash hands often and cover coughs, and watch for lingering fatigue.

Protecting a Newborn or High-Risk Family Member

Make sure all caregivers are vaccinated.
Ask visitors who are ill to postpone their visit.
Have everyone wash hands before touching the baby.
Keep babies out of crowds during peak flu season when possible.
If someone in the house has flu, keep them in a separate room if possible and have one person care for them.

Frequently Asked Questions

Can the flu vaccine give my child the flu?

No. The flu shot is made with inactivated virus or a single protein, so it cannot cause flu. Mild reactions such as soreness or low fever can happen.

Is it too late to vaccinate if flu is already spreading?

No. As long as flu viruses are circulating, getting vaccinated is still worthwhile.

How long is a child with flu contagious?

Most people are most contagious in the first three to four days of illness, according to the CDC, but children may spread the virus for longer.

Should I give my child aspirin for a fever?

No. Do not give aspirin to children and teens with flu-like illness. Ask your pediatrician about safe alternatives.

Can my child get the flu twice?

Yes. There are several types of flu virus, and you can catch different strains in the same season.

The Bottom Line

Flu season is predictable, which means your family can prepare. Get everyone vaccinated, wash hands, keep sick kids home and know the emergency warning signs. Call your pediatrician early for a child under 5 or one with a health condition, and head for emergency care if breathing becomes difficult. A little planning now can spare your family a lot of misery later.