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Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc
Ages 7 through 12 Months. Using the method described in Chapter 2 to extrapolate from the AI for infants ages 0 through 6 months fed human milk, the intake from human milk for the older infants is 483 μg RAE/day of vitamin A.
The vitamin A intake for older infants can also be determined by estimating the intake from human milk (concentration × 0.6 L/ day) and complementary foods (Chapter 2). Vitamin A intake data (n = 45) from complementary foods was estimated to be 244 μg/day based on data from the Third National Health and Nutrition Examination Survey. The average intake from human milk is approximately 291 μg/day (485 μg/L × 0.6 L/day). Thus, the total vitamin A intake is estimated to be 535 μg RAE/day (244 μg/day + 291 μg/day).
On the basis of these two approaches and rounding, the AI was set at 500 μg RAE/day. The AI for infants is greater than the Recommended Dietary Allowance (RDA) for young children because the RDA is based on extrapolation of adult data (see “Children and Adolescents Ages 1 through 18 Years”).