Although levels of copper in breast milk appear to be low, it is readily absorbed. Breast-fed term infants obtain adequate copper to meet requirements from stores in the liver and from breast milk until they have approximately doubled their birth weight. Unmodified cow's milk is particularly low in copper and does not meet the requirements for infants if used as a main drink under the age of 1 year; modified infant formulas are fortified with copper. Deficiency has been reported in infants and young children who consume a diet containing large quantities of cow's milk and few complementary foods. Most recommendations for copper intake in children have been extrapolated from infant and adult data and recommendations vary considerably worldwide.
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