Food, immunization, sanitation (safe water), in combination with mother education in health and nutrition, were examined for nutritional health impact in a longitudinal study on 544 infants using several nutritional indices involving weight and height or length. Socioeconomic impact on infant growth and development overshadowed intervention effects when weight for age served as the nutritional index. Using both weight and height in an index expressing their true relationship during growth in normal infants provided a better insight into the effect of intervention, particularly with respect to food, immunization, and education.
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Solon et al. (1985) studied this question.