Infant Feeding in the Second 6 Months of Life Related to Iron Status: An Observational Study

Arch Dis Child. 2007 Oct;92(10):850-4. doi: 10.1136/adc.2006.114074. Epub 2007 May 30.

Abstract

Objective: To investigate the relationship between iron status in infancy and type of milk and weaning solids consumed.

Design: An observational cohort study.

Setting: 928 term infants from the Avon Longitudinal Study of Parents and Children in 1993-94.

Methods: Haemoglobin and ferritin concentrations at 8 and 12 months were assessed in relation to type and quantity of milk intake at 8 months.

Results: By WHO criteria, 22.7% of the infants were anaemic at 8 months and 18.1% at 12 months. More breast--than formula-fed infants were anaemic at 8 and 12 months. Cows' milk as the main drink was associated with increased anaemia at 12 months and low ferritin at 8 and 12 months. No association was found between any nutrients and haemoglobin concentrations. Protein and non-haem iron intakes were positively associated with ferritin concentrations and calcium intake negatively. This effect was more marked in infants being fed cows' milk. More than 25% of infants in the breast milk and cows' milk groups and 41% of infants having >6 breast feeds per day had iron intakes below the lower reference nutrient intake. Feeding cows' milk or formula above 600 ml or >6 breast feeds per day was associated with lower intakes of solids.

Conclusions: Both breast and cows' milk feeding were associated with higher levels of anaemia. Satisfactory iron intake from solids in later infancy is more likely if formula intake is <600 ml per day and breast feeds are limited to <6 feeds per day. Cows' milk should be strongly discouraged as a main drink before 12 months.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anemia, Iron-Deficiency / diagnosis*
  • Anemia, Iron-Deficiency / prevention & control
  • Animals
  • Breast Feeding / adverse effects*
  • Cohort Studies
  • Female
  • Ferritins
  • Humans
  • Infant
  • Infant Formula / administration & dosage
  • Infant Nutritional Physiological Phenomena
  • Male
  • Milk / adverse effects*
  • Multivariate Analysis
  • Nutritional Requirements

Substances

  • Ferritins