CDC has created recommendations to help adults have conversations with children about COVID-19 and ways they can avoid getting and spreading the disease.

Children may worry about themselves, their family, and friends getting ill with COVID-19. Parents, family members, school staff, and other trusted adults can play an important role in helping children make sense of what they hear in a way that is honest, accurate, and minimizes anxiety or fear.

Source: https://tools.cdc.gov/api/embed/downloader/download.asp?m=404952&c=407489