Limited Evidence on Face Masks and Children

According to Healthfeedback.org, To reduce the spread of COVID-19, it is important for children to practice the same precautionary measures as adults, such as mask-wearing, frequent handwashing, and physical distancing, as the U.S. Centers for Disease Control and Prevention (CDC) recommends.
Cloth face masks are safe for children over the age of two years old to wear, according to the American Academy of Pediatrics. To reduce the spread of COVID-19, it is important for children to practice the same precautionary measures as adults, such as mask-wearing, frequent handwashing, and physical distancing, to limit the spread of COVID-19. While children are generally less likely to develop severe COVID-19 symptoms, some develop serious illnesses following mild cases of COVID-19, which is known as a multisystem inflammatory syndrome. Furthermore, children can still transmit the virus to populations that are at risk for severe COVID-19, like the elderly, albeit with a lower probability than adults.

WHO reported that children should follow the same principles as for adults for wearing masks. This includes cleaning hands at least 20 seconds if using an alcohol-based hand rub, or at least 40 seconds if using soap and water, before putting on the mask. 

Misbar's investigation didn't find any studies that support the circulating claim.