Nutritional rickets is a rare disorder in modern society. We report the case of a patient with rickets presentingwith genu valgum (knock-knees). Subsequent investigations revealed the patient had insufficient totalblood 25-hydroxyvitamin D owing to prolonged breastfeeding. He was treated successfully with calciferolfor a period of 6 months followed by maintenance therapy with multivitamins and nutritional advice. Toour knowledge, this is the first report of nutritional rickets due to prolonged breastfeeding in Hong Kong.The ensuing discussion highlights the need to provide adequate guidance on vitamin supplementation tobreastfeeding mothers to prevent vitamin deficiency in their infants.
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