A previous study demonstrated that vitamin D metabolites up-regulate the synthesis of intercellular antimicrobial peptide(cathelicidin) which is capable of killing micro-organisms and viruses [4]. Vitamin D levels above the threshold of 20 ng/ml(50 nmol/L) are necessary to optimize bone density and immunological health in children [5]. Studies have demonstrated the role of vitamin D in decreasing the risk of pediatric infections [6] and acute lower respiratory tract infections [7] and also linked vitamin D deficiency with severe lower tract respiratory infections requiring hospitalisation [8, 9]. The severity of allergic diseases tend to increase in children who have lower levels of vitamin D. In addition, a recent clinical study suggests a therapeutic role for vitamin D supplementation in the treatment of allergic diseases