The vitamin B
6 nutritue of breast-fed infants was evaluated by vitamin B
6 intake, plasma pyridoxal 5'-phosphate (PLP) concentration, and growth patterns during the infants' first 6 mo of age. Vitamin B
6 intakes of 47 healthy, term infants were significantly correlated with four levels of maternal vitamin B
6 supplements: 2.5, 4.0, 7.5, or 10.0mg pyridoxine (PN)⋅HCl/d and met the B
6 Adequate Intake (AI, 1998) of 0.1mg/d for infants 0 to 6mo. Only infants whose mothers received 10.0mg PN⋅HCl/d exceeded or met the Recommended Dietary Allowances (RDA, 1989) of 0.3mg vitamin B
6/d from 4 to 6mo of age. Plasma PLP concentrations of infants, measured at 1, 4, and 6mo of age paralleled their mother's vitamin B
6 intake. Most infants showed normal growth. The findings indicated that a maternal PN⋅HCl supplement of 2.5mg/d provided an adequate amount of vitamin B
6 in breast milk (0.15mg/d) for the vitamin B
6 status parameters and the growth of breast-fed infants.
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