Recent data suggest that adults may experience long-term symptoms after COVID-19 infection, but if such symptoms also occur in children is still unknown. Children tend to have milder COVID-19 than adults, but in a case-report from Sweden, Professor and pediatrician Jonas F Ludvigsson describes five children with potential “long COVID”. These findings, together with a systematic review of long COVID in children, are published in the journal Acta Paediatrica.