The vitamin A status of lactating women, its effect on the vitamin A content of human milk, and the adequacy of human milk as a source of vitamin A for the infant were assessed, comparing data from developing countries with those from developed countries. The vitamin A concentration in breast milk during the first two weeks of lactation is nearly double that at one month. It is even higher in preterm milk than in term milk during the first several months. Human milk alone provides sufficient vitamin A to prevent clinical deficiency throughout the first 12 months of life, even in presumably more poorly nourished populations in developing countries. However, it is not sufficient to allow liver storage after about six months of lactation.
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