2. Iron absorption study Twenty additional children with a positive Urea breath test and iron deficiency anemia will be selected for the Iron absorption study. The purpose of the study and all procedures related to iron absorption study will be explained to the parents and consents will be obtained. Before commencing the iron absorption study, all children will be given a commercial whey adjusted cows’ milk formula with 8 mg Fe/l (Nidina 1; Nestle, Paris, France) for a period of at least three weeks. After 21 days of formula feedings they will be admitted to the Metabolic Ward of Clinical Research and Service Center.