Skip Ribbon Commands
Skip to main content
Health Issues

Mask Mythbusters: Common Questions about Kids & Face Masks

little girl in mask and kickboxing gear little girl in mask and kickboxing gear

By: Kimberly M. Dickinson, MD, MPH & Theresa W. Guilbert, MD, MS, FAAP

Face masks are still an important tool for many families to help prevent the spread of SARS-CoV-2, the virus that causes COVID-19. This includes new and more contagious variants.

Masks help protect unvaccinated and vaccinated people, and are important for individuals to use in areas where the COVID-19 Community Level is high. Masks can be safely worn by all children older than 2 years. Individuals may choose to continue wearing face masks when they go out so they can protect themselves or their family members.

Some parents may have concerns about face masks, and we're here to help. Here are some common questions, along with the facts about kids and masks that will put your mind at ease:

Do masks make it harder for my child to breathe?

There have been concerns that face masks can reduce oxygen intake, and can lead to low blood oxygen levels, known as hypoxemia. However, masks are made from breathable materials that will not block the oxygen your child needs. Masks have not been shown to affect a child's ability to focus or learn in school. The vast majority of children age 2 or older can safely wear face masks for extended periods of time, such as during preschool or at child care. This includes most children with special health care needs.

Can masks interfere with a child's lung development?

No, wearing a face mask will not affect your child 's lungs from developing normally. This is because oxygen flows through and around the mask, while blocking the spray of spit and respiratory droplets that may contain the virus. Keeping your child's lungs healthy is important, which includes preventing infections like COVID-19.

Do masks trap the carbon dioxide that we normally breathe out?

No. There have been false reports that face masks can lead to carbon dioxide poisoning (known as hypercapnia) from re-breathing the air we normally breathe out. But this is not true. Carbon dioxide molecules are very tiny, even smaller than respiratory droplets. They cannot be trapped by breathable materials like disposable masks. In fact, surgeons wear tight fitting masks all day as part of their jobs, without any harm.

Children under 2 years of age should not wear masks since they may not be able to remove them without help. Children with severe breathing problems or cognitive impairments may also have a hard time tolerating a face mask and extra precautions may be needed.

Can masks lead to a weaker immune system by putting the body under stress?

No. Wearing a face mask does not weaken your immune system or increase your chances of getting sick if exposed to the COVID-19 virus. Wearing a mask, even if you do not have symptoms of COVID-19, helps prevent the virus from spreading.

How do masks prevent the spread of COVID-19?

When worn correctly, face masks create a barrier that reduces the spray of a person's spit and respiratory droplets. These droplets play a key role in the spread of COVID-19 because they can carry SARS-CoV-2, the virus that causes COVID-19. Masks also can protect you from others who may have coronavirus but are not showing symptoms and who could come within 6 feet of you, which is how far respiratory droplets can travel when people sneeze or cough or raise their voices.

In order to be effective, masks should:

  • Cover both the nose and mouth

  • Fit snugly but comfortably against the sides of the face

  • Be secured with ear loops or ties

  • Have multiple layers

  • Allow for unrestricted breathing

Another benefit of wearing masks is that they may keep people from touching their mouths and faces, which is another way COVID, colds, flu and RSV and other respiratory diseases are spread.


Masks are an important strategy to prevent COVID from spreading, especially as new contagious variants circulate. Masks are safe and effective for anyone age 2 years or older. Don't hesitate to talk with your child's pediatrician if you have any questions about your child wearing face masks.

More information

About Dr. Dickinson

Kimberly M. Dickinson, MD, MPH, FAAP, a pediatric pulmonary fellow at Johns Hopkins University in Baltimore, Md., is a past member of the AAP Section on Pediatric Pulmonology and Sleep Medicine Trainee Subcommittee.

About Dr. Guilbert

Theresa W. Guilbert, MD, MS, FAAP, is a professor of pediatrics at the University of Cincinnati and director of the Cincinnati Children's Hospital Medical Center Asthma Center in the Pulmonary Division. She is a member of the AAP Section on Pediatric Pulmonology and Sleep Medicine Executive Committee.

Last Updated
American Academy of Pediatrics Section on Pulmonary and Sleep Medicine (Copyright © 2020)
The information contained on this Web site should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances.
Follow Us