RESUMEN
BACKGROUND: We were interested in identifying possible nutritional reasons for growth faltering among breastfed infants in the rural farming community of San Mateo, Capulhuac, Mexico (2800 m above sea level). OBJECTIVE: We examined the prevalence of inadequate iron and folate status among lactating Otomi women and determined to what extent their iron and folate nutriture influenced the milk concentrations of these nutrients. DESIGN: Lactating women (n = 71) provided blood and milk samples and dietary information at a mean (+/- SD) of 22 +/- 13 d postpartum. Blood indexes included hemoglobin, hematocrit, serum iron, total-iron-binding capacity, ferritin, transferrin receptor, mean cell volume, plasma folate, and erythrocyte folate. RESULTS: Approximately 62% and 58% of the women had nutritional anemia defined as a hemoglobin concentration