Iron and zinc supplementation promote motor development and exploratory behaviour among Bangladeshi infants

Iron and zinc supplementation promote motor development and exploratory behaviour among Bangladeshi infants

Iron and zinc supplements for infants can be beneficial to infant development and behaviour.

Iron and zinc deficiency are prevalent during infancy in low-income countries. The objectives of this study were to examine whether a weekly supplement of iron, zinc, iron and zinc, or a micronutrient mix (MM) of 16 vitamins and minerals would alter infant development and behaviour.

The participants were 221 infants from rural Bangladesh at risk of micronutrient deficiencies. Development and behaviour were evaluated at 6 and 12 months of age by using the Bayley Scales of Infant Development II and the Home Observation Measurement of Environment (HOME) scale.

In this double-blind trial, the infants were randomly assigned to one of five treatment conditions: iron (20 mg), zinc (20 mg), iron and zinc, MM (16 vitamins and minerals, including iron and zinc), or riboflavin weekly from six to twelve months of age. Multivariate analyses were conducted to examine the change in development and behaviour for each supplementation group, with control for maternal education, HOME score, months breastfed, anemia, growth at 6 months, and change in growth from 6 to 12 months.

Iron and zinc administered together and with other micronutrients had a beneficial effect on infant motor development. Iron and zinc administered individually and in combination had a beneficial effect on orientation-engagement. Two-thirds of the infants were mildly anemic, no treatment effects on hemoglobin concentration were observed, and hemoglobin was not associated with measures of development or behavior.

The beneficial effects of weekly iron and zinc supplementation on motor development and orientation-engagement suggest that infants benefit from these minerals when administered together.

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