الفهرس 
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Abstract
the aim of our study is to measure the serum level of 25 (OH) D, serum calcium, serum phosphorus and serum alkaline phosphatase in exclusively breast fed infants at the ages 2,4 and months to find out the proper time to start vitamin D supplementation in breast fed infants.also , to study the effects of certain factors on maternal vitamin D status as maternal vsiling , dietary habits and maternal vitamin D supplementation durring pregnancy.