Masks help keep children safe against COVID-19. Everyone, vaccinated or not, including children 2+, should wear masks indoors in public in areas with high numbers of COVID-19 cases.
This video can also be viewed at
https://www.cdc.gov/coronavirus/2019-ncov/videos/what-to-know-about-kids-and-masks/Masks_kids-animation-1920×1080-1.png