On 21 August 2020, WHO published annex to the Advice on the use of masks in the context of COVID-19 titled Advice on the use of masks for children in the community in the context of COVID-19. According to the limited available evidence, young children may have lower susceptibility to infection compared to adults, however available data suggests that this may vary by age among children. Data from sero-epidemiology studies and transmission studies suggest that older children (e.g. teenagers) may play a more active role in transmission than younger children. The benefits of wearing masks in children for COVID-19 control should be weighed against potential harm associated with wearing masks, including feasibility and discomfort, as well as social and communication concerns. Factors to consider also include age groups, sociocultural and contextual considerations and availability of adult supervision and other resources to prevent transmission. WHO and UNICEF advise decision makers to apply some criteria for use of masks in children when developing national policies, in countries or areas where there is known or suspected community transmission of SARS- CoV-2 and in settings where physical distancing cannot be achieved.