Vitamin D is a steroid hormone that plays a major role in maintaining skeletal health and it also has a role in disorders other than bone metabolism. In the paediatric population, vitamin D deficiency has emerged as a significant public health problem throughout the world and majority of children has vitamin D deficiency in spite of wide availability of sunlight. Vitamin D deficiency status is defined as deficiency when 25(OH)D level is less than 30 ng/mL (75 nmol/L) The manifestations of deficiency may vary from hypocalcemic seizures and tetany in infancy, florid rickets in toddlers, and pain in adolescent.