COVID-19 Vaccine for Kids: What You Need to Know The COVID-19 vaccine is an important tool to keep kids safe from COVID-19. Vaccines are available for free for everyone 6 months and older. Some kids may still get COVID after getting the vaccine, but being vaccinated reduces their risk of severe illness. Kids may have side effects like a sore arm, achy muscles, and tiredness that can last a day or two. Children who get the COVID vaccine are extremely unlikely to experience any serious problems. Talk with your child's doctor and learn more at mass.gov/CovidVaccine COVID - 19 Vaccine for Kids : What You Need to Know The COVID - 19 vaccine is an important tool to keep kids safe from COVID - 19 . Vaccines are available for free for everyone 6 months and older . Some kids may still get COVID after getting the vaccine , but being vaccinated reduces their risk of severe illness . Kids may have side effects like a sore arm , achy muscles , and tiredness that can last a day or two . Children who get the COVID vaccine are extremely unlikely to experience any serious problems . Talk with your child's doctor and learn more at mass.gov/CovidVaccine