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Iron deficiency in infants is associated with suboptimal motor development, but whether iron supplementation during infancy or pregnancy improves motor development remains unclear.
In a randomized, controlled trial, 1196 term infants received either oral iron supplementation (1 mg/kg elemental iron) or placebo between ages 6 weeks and 9 months. The participants were children of mothers in a rural community in China who had been randomized to take either a folate/iron or folate/placebo supplement during pregnancy. Iron status in mothers and infants was measured by serum ferritin or zinc protoporphyrin/heme. Gross motor development, neurological integrity, and motor performance were measured with standardized tests at 9 months. More than 80% o…