Vitamin D and morbidity in children with Multisystem inflammatory syndrome related to Covid-19

•Multisystem Inflammatory Syndrome in Children (MIS-C) has been related to a late presentation of Covid-19 infection.•Previous studies in critically ill children have shown an association between severe disease and vitamin D deficiency.•We report a possible association between severe vitamin D deficiency and severe disease in children with MIS-C.•Severe vitamin D deficiency was associated with cardiac involvement, prolonged ICU, and hospital length of stay.