TABLE 9-6, Summary Illustration of Median Absorbed Iron Requirements for Infants and Young Children - Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc

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TABLE 9-6Summary Illustration of Median Absorbed Iron Requirements for Infants and Young Children

Age (y)	Weight^a (kg)	Estimated Surface Area^b (m²)	Estimated Change in Hemoglobin Mass^c (g/y)	Basal Loss^d (mg/d)
Infants 6–12 mo^h	8.7	—	—	0.26
Males
1.5	11.6	0.5340	30.2	0.29
2.5	13.6	0.6064	19.8	0.33
3.5	15.5	0.6700	22.7	0.36
4.5	17.5	0.7353	21.8	0.39
5.5	19.6	0.7996	26.2	0.43
6.5	21.9	0.8675	26.7	0.47
7.5	24.7	0.9422	29.9	0.51
8.5	26.8	0.9980	35.7	0.54
Females
1.5	10.8	0.5104	33.5	0.27
2.5	12.8	0.5842	28.4	0.31
3.5	14.7	0.6486	22.5	0.35
4.5	16.8	0.7166	24.4	0.39
5.5	19.0	0.7845	20.7	0.42
6.5	21.3	0.8524	19.7	0.46
7.5	23.8	0.9209	29.9	0.49
8.5	26.9	0.9986	27.0	0.54
			Total Iron Need^g
Hemoglobin Iron Deposition (mg/d)	Increase in Tissue Iron^e (mg/d)	Increase in Storage Iron^f (mg/d)	Median (mg/d)	97.5th Percentile (g/d)
0.37	0.009	0.051	0.69	1.07
0.28	0.004	0.038	0.62	1.24
0.18	0.004	0.023	0.54	1.23
0.21	0.004	0.025	0.61	1.36
0.20	0.004	0.021	0.63	1.45
0.24	0.004	0.019	0.70	1.60
0.25	0.004	0.015	0.74	1.71
0.28	0.004	0.011	0.81	1.86
0.33	0.004	0.006	0.81	2.01
0.31	0.004	0.038	0.64	1.25
0.26	0.004	0.032	0.63	1.30
0.21	0.004	0.026	0.59	1.32
0.23	0.004	0.023	0.65	1.45
0.19	0.004	0.016	0.64	1.52
0.15	0.004	0.011	0.66	1.61
0.28	0.004	0.011	0.79	1.83
0.25	0.004	0.005	0.80	1.92

a: Representative anthropometry for modeling, based on Frisancho (1990).
b: Computed by equation of Haycock et al. (1978).
c: Derived from Table 9-7.
d: Based on 0.538 mg/m²/d, extrapolated from Green et al. (1968).
e: Based on assumed 0.7 g/kg body weight gain (Smith and Rios, 1974).
f: Calculated as 12 percent of total iron deposition through 3.0 years of age then falling; no provision for storage at 9.0 years of age.

g: Estimates derived from simulated population that take into account impact of skewing and are the basis for the Estimated Average Requirement (EAR) and Recommended Dietary Allowance (RDA).
h: Requirements for infants and young children were estimated by different methods. Upper limit of absorption for infants and children is 10 and 18 percent, respectively. See text for methods used for infants and children.

From: 9, Iron

Cover of Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc

Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc.

Institute of Medicine (US) Panel on Micronutrients.

Washington (DC): National Academies Press (US); 2001.

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