Breast milk content of vitamin A is dependent on the mother's status, and term infants who are breast fed by a well-nourished mother will meet their requirements until approximately 6 months of age. The United Kingdom recommends a supplement of vitamin A for breast-fed infants between the ages of 6 months and 5 years because it is difficult to obtain adequate quantities from weaning foods. Clinical vitamin A deficiency is a major cause of childhood blindness in developing countries but is rarely seen in Western countries. There is growing evidence that mild or subclinical vitamin A deficiency is associated with increased susceptibility to infection.
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