COVID-19 vaccines for kids: What you need to know

By Mayo Clinic Staff

Coronavirus disease 2019 (COVID-19) vaccines are now available to children ages 5 and up in the U.S. Here's what parents and kids need to know about the safety and effectiveness of the vaccine, the possible side effects, and the benefits of getting vaccinated.

If children don't frequently experience severe illness with COVID-19, why do they need a COVID-19 vaccine?

A COVID-19 vaccine can prevent your child from getting COVID-19 and spreading it at home and in school.

If your child gets COVID-19, a COVID-19 vaccine could prevent severe illness.

Getting a COVID-19 vaccine can also help keep your child in school and more safely have playdates and participate in sports and other group activities.

What COVID-19 vaccines, additional primary shots and boosters have been approved for kids in the U.S.?

In the U.S., COVID-19 vaccines are available to children by age group:

  • Ages 5 through 11. The U.S. Food and Drug Administration (FDA) has given emergency use authorization to a Pfizer-BioNTech COVID-19 vaccine for this age group. This vaccine involves two shots, given three weeks apart. It contains a lower dose than the Pfizer-BioNTech COVID-19 vaccine used for people age 12 and older. Research shows that this vaccine is about 91% effective in preventing COVID-19 in children ages 5 through 11.
  • Ages 12 through 15. The FDA has given emergency use authorization to a Pfizer-BioNTech COVID-19 vaccine for this age group. This vaccine involves two shots. The second dose can be given three to eight weeks after the first dose. It contains the same dose as the Pfizer-BioNTech COVID-19 vaccine for people ages 16 and older. Research has shown that this vaccine is 100% effective in preventing COVID-19 in children ages 12 through 15.
  • Ages 16 and older. The FDA has approved a Pfizer-BioNTech COVID-19 vaccine, now called Comirnaty, for this age group. This vaccine involves two shots. The second dose can be given three to eight weeks after the first dose. This vaccine is 91% effective in preventing severe illness with COVID-19 in people age 16 and older.

The shortest interval between the first and second doses of mRNA COVID-19 vaccines is still recommended for people who have weakened immune systems and others who need rapid protection due to concern about community transmission or risk of severe illness. An eight-week interval between the first and second doses might be best for some people age 12 and older, especially males ages 12 to 39.

An additional primary shot of a COVID-19 vaccine can help people who are vaccinated and might not have had a strong enough immune response. The CDC now recommends that children ages 5 and older who have moderately or severely weakened immune systems should get an additional dose of the Pfizer-BioNTech COVID-19 vaccine. This shot should be given at least four weeks after the second shot.

Booster doses can help people who are vaccinated and whose immune response weakened over time. Research suggests that getting a booster dose can decrease the risk of infection and severe illness with COVID-19. Kids ages 5 through 17 should get a Pfizer-BioNTech COVID-19 vaccine booster shot if they have been given both doses of the Pfizer-BioNTech COVID-19 vaccine and it’s been at least five months.

How did the FDA determine the safety and effectiveness of the Pfizer-BioNTech COVID-19 vaccines for use in kids?

For kids ages 5 through 11, the FDA reviewed a vaccine study of more than 4,600 children in this age range. Of this group, about 3,100 were given the Pfizer-BioNTech COVID-19 vaccine. The other children were given an inactive (placebo) shot. Children who were given the vaccine were monitored for side effects for at least 2 months after the second dose. Side effects were generally mild to moderate.

The FDA also took an early look at cases of COVID-19 that occurred one week after children were given a second dose of the vaccine. None of the children in this analysis had been previously diagnosed with COVID-19. Among 1,305 children given the vaccine, there were 3 cases of COVID-19. Among 663 children given the placebo, there were 16 cases of COVID-19. The results suggest that the vaccine is about 91% effective in preventing COVID-19 in this age group.

For kids ages 12 through 15, the FDA reviewed a vaccine study of more than 2,200 U.S. children in this age range. Of this group, about half were given the Pfizer-BioNTech COVID-19 vaccine. The other children were given a placebo shot.

A week after the second dose was given, there were no cases of COVID-19 in the 1,005 children given the Pfizer-BioNTech vaccine. Among 978 children given the placebo, there were 16 cases of COVID-19. None of the children had previously been diagnosed with COVID-19. The results suggest that the vaccine is 100% effective at preventing COVID-19 in this age group.

What are the side effects of the Pfizer-BioNTech COVID-19 vaccines for kids?

Children given the Pfizer-BioNTech COVID-19 vaccines had side effects similar to those experienced by people age 16 and older. The most commonly reported side effects include:

  • Pain, redness or swelling where the shot was given
  • Fatigue
  • Headache
  • Chills
  • Muscle pain
  • Fever
  • Joint pain
  • Swollen lymph nodes
  • Nausea and vomiting
  • Feeling unwell

Similar to adults, children have side effects within 2 days after vaccination that typically last 1 to 3 days. More children reported these side effects, except for injection site pain, after the second dose of the vaccine. However, some people have no side effects.

After your child is given a COVID-19 vaccine, he or she will be monitored for 15 to 30 minutes to see if he or she has an allergic reaction that requires treatment.

It isn't recommended that you give your child an over-the-counter pain reliever before vaccination to prevent side effects. It's OK to give this kind of medication after your child gets a COVID-19 vaccine.

Can COVID-19 vaccines affect the heart?

In the U.S., there has been an increase in reported cases of myocarditis and pericarditis after mRNA COVID-19 vaccination, particularly in males ages 12 to 29. Myocarditis is the inflammation of the heart muscle, while pericarditis is the inflammation of the lining outside the heart. These reports are rare.

Of the cases reported, the problem happened more often after the second dose of the COVID-19 vaccine and typically within one week of COVID-19 vaccination. Most of the people who got care quickly felt better after receiving medicine and resting. Symptoms to watch for include:

  • Chest pain
  • Shortness of breath
  • Feelings of having a fast-beating, fluttering or pounding heart

If your child has any of these symptoms within a week of getting a COVID-19 vaccine, seek medical care.

If your child develops myocarditis or pericarditis after a dose of an mRNA COVID-19 vaccine, the CDC recommends avoiding getting another dose of any COVID-19 vaccine.

Is there any research on the long-term effects of the Pfizer-BioNTech COVID-19 vaccines?

Because COVID-19 vaccine clinical trials only started in the summer of 2020, it's not yet clear if the vaccines will have long-term effects. However, vaccines rarely cause long-term effects.

A portion of the children in each age group were monitored for safety for at least two months after being given the second dose of the COVID-19 vaccine.

As part of its first request for emergency use authorization of its COVID-19 vaccine in 2020, Pfizer Inc. created a safety monitoring plan. The plan now includes the monitoring of children and adolescents given the COVID-19 vaccine.

In addition, in the U.S. all vaccination providers are required to report serious adverse events, such as allergic reactions, to a national program called the Vaccine Adverse Event Reporting System.

How do the Pfizer-BioNTech COVID-19 vaccines work?

The Pfizer-BioNTech COVID-19 vaccines use messenger RNA (mRNA). Researchers have been studying mRNA vaccines for decades.

Coronaviruses have a spikelike structure on their surface called an S protein. COVID-19 mRNA vaccines give cells instructions for how to make a harmless piece of an S protein. After vaccination, muscle cells begin making the S protein pieces and displaying them on cell surfaces. The immune system recognizes the protein and begins building an immune response and making antibodies. After delivering instructions, the mRNA is immediately broken down. It never enters the nucleus of the cell, where DNA is kept.

Is there any difference in the ingredients or dosing of the Pfizer-BioNTech COVID-19 vaccines for younger children, older children or adults?

The Pfizer-BioNTech COVID-19 vaccine for children ages 5 through 11 contains a lower dose (10 micrograms) than the vaccine used for older children and adults (30 micrograms). Smaller needles are being used to deliver the vaccine to children ages 5 through 11.

The Pfizer-BioNTech COVID-19 vaccine for children ages 5 through 11 also contains a different buffer than the vaccine used for older children and adults. This different buffer, which is used in other FDA-approved vaccines, will help keep the vaccine stable in refrigerated temperatures for longer.

The ingredients and dosing of the Pfizer-BioNTech COVID-19 vaccine are the same for children ages 12 through 15 and people age 16 and older.

Are there any children who shouldn't get the Pfizer-BioNTech COVID-19 vaccine?

This vaccine is not yet available to children younger than age 5. Clinical trials involving younger children are in progress.

The vaccine also shouldn’t be given to a child with a known history of a severe allergic reaction to any of its ingredients. If this is the case, your child might be able to get another COVID-19 vaccine in the future.

Can a COVID-19 vaccine give a child COVID-19?

No. The COVID-19 vaccines currently being developed in the U.S. don't use the live virus that causes COVID-19.

Can a COVID-19 vaccine affect fertility or menstruation?

There is no evidence that any vaccines, including COVID-19 vaccines, cause fertility problems in men or women.

It's not clear if getting COVID-19 or a COVID-19 vaccine causes changes in menstruation. A new study of about 4,000 people suggests that getting a COVID-19 vaccine is linked with a less than one-day change in menstrual cycle length for each dose. Keep in mind that many things can affect menstrual cycles, including infections, stress, sleep problems, and changes in diet or exercise.

Can children who get COVID-19 experience long-term effects?

Anyone who has had COVID-19 can develop a post-COVID-19 condition. Research suggests that children with both mild and severe COVID-19 have experienced long-term symptoms. The most common symptoms in children include:

  • Tiredness or fatigue
  • Headache
  • Trouble sleeping
  • Trouble concentrating
  • Muscle and joint pain
  • Cough

These symptoms could affect your child’s ability to attend school or do his or her usual activities. If your child is experiencing long-term symptoms, consider talking to your child’s teachers about his or her needs.

How can children get a COVID-19 vaccine?

Consult your local health department, pharmacy or your child’s doctor for information on where your child can get a COVID-19 vaccine. When making an appointment for your child to get a COVID-19 vaccine, consider asking these questions:

  • Does a parent or guardian need to be present at the appointment?
  • What information will need to be provided during the appointment?
  • Is there a limit on how many family members, such as siblings, can attend the appointment?

How soon can a child get a COVID-19 vaccine before or after getting another vaccine?

A COVID-19 vaccine and other vaccines can be given on the same day.

Remember, COVID-19 vaccination will protect most people from getting sick with COVID-19. If you have questions or concerns about your child getting a COVID-19 vaccine, talk to your child's doctor. He or she might be able to help you weigh the risks and benefits.

From Mayo Clinic to your inbox

Sign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health.

To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail.

May 20, 2022 See more In-depth

See also

  1. Antibiotics: Are you misusing them?
  2. COVID-19 and vitamin D
  3. Convalescent plasma therapy
  4. Coronavirus disease 2019 (COVID-19)
  5. COVID-19: How can I protect myself?
  6. Cough
  7. Herd immunity and coronavirus
  8. COVID-19 and pets
  9. COVID-19 and your mental health
  10. COVID-19 antibody testing
  11. COVID-19, cold, allergies and the flu
  12. COVID-19 drugs: Are there any that work?
  13. Long-term effects of COVID-19
  14. COVID-19 tests
  15. COVID-19 in babies and children
  16. Coronavirus infection by race
  17. COVID-19 travel advice
  18. COVID-19 vaccine: Should I reschedule my mammogram?
  19. COVID-19 vaccines
  20. COVID-19 variant
  21. COVID-19 vs. flu: Similarities and differences
  22. COVID-19: Who's at higher risk of serious symptoms?
  23. Debunking coronavirus myths
  24. Diarrhea
  25. Different COVID-19 vaccines
  26. Extracorporeal membrane oxygenation (ECMO)
  27. Fever
  28. Fever: First aid
  29. Fever treatment: Quick guide to treating a fever
  30. Fight coronavirus (COVID-19) transmission at home
  31. Honey: An effective cough remedy?
  32. How do COVID-19 antibody tests differ from diagnostic tests?
  33. How does COVID-19 affect people with diabetes?
  34. How to take your pulse
  35. How to measure your respiratory rate
  36. How to take your temperature
  37. How well do face masks protect against COVID-19?
  38. Loss of smell
  39. Mayo Clinic Minute: You're washing your hands all wrong
  40. Mayo Clinic Minute: How dirty are common surfaces?
  41. Multisystem inflammatory syndrome in children (MIS-C)
  42. Nausea and vomiting
  43. Pregnancy and COVID-19
  44. Red eye
  45. Safe outdoor activities during the COVID-19 pandemic
  46. Safety tips for returning to school during COVID-19
  47. Sex and COVID-19
  48. Shortness of breath
  49. Thermometers: Understand the options
  50. Treating COVID-19 at home
  51. Unusual symptoms of coronavirus
  52. Watery eyes