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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”).

Vitamin A AI Summary, Ages 0 through 12 Months

AI for Infants

 

0–6 months

400 μg RAE/day of vitamin A

7–12 months

500 μg RAE/day of vitamin A

Intake Stage of Lactation

Milk Concentration (μg/L)

Estimated Vitamin A Intake of Infants (μg/d)a

1 mo

329

256

3–4

d 37 d

2,000

≈600

1,560

468

< 6 mo

314

485

245

380

> 1 mo

640

500



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