Infant Feeding and School Attainment in Five Cohorts from Low- and Middle-Income Countries
Open Access
- 20 August 2013
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 8 (8), e71548
- https://doi.org/10.1371/journal.pone.0071548
Abstract
Performance in intelligence tests tends to be higher among individuals breastfed as infants, but little is known about the association between breastfeeding and achieved schooling. We assessed the association of infant feeding with school achievement in five cohorts from low- and middle-income countries. Unlike high-income country settings where most previous studies come from, breastfeeding is not positively associated with socioeconomic position in our cohorts, thus reducing the likelihood of a spurious positive association. Participants included 10,082 young adults from five birth cohorts (Brazil, India, Guatemala, the Philippines, and South Africa). The exposures variables were whether the subject was ever breastfed, total duration of breastfeeding, and age at introduction of complementary foods. We adjusted the estimates for age at follow up, sex, maternal age, smoking during pregnancy, birthweight and socioeconomic position at birth. The key outcome was the highest grade achieved at school. In unadjusted analyses, the association between ever breastfeeding and schooling was positive in Brazil, inverse in the Philippines, and null in South Africa; in adjusted analyses, these associations were attenuated. In Brazil, schooling was highest among individuals breastfed for 3–12 months whereas in the Philippines duration of breastfeeding was inversely associated with schooling; and null associations were observed in South Africa and Guatemala. These associations were attenuated in adjusted models. Late introduction of solid foods was associated with lower schooling achievement in Brazil and South Africa. Measures of breastfeeding are not consistently related to schooling achievement in contemporary cohorts of young adults in lower and middle-income countries.This publication has 36 references indexed in Scilit:
- What are the causal effects of breastfeeding on IQ, obesity and blood pressure? Evidence from comparing high-income with middle-income cohortsInternational Journal of Epidemiology, 2011
- Infant-feeding patterns and cardiovascular risk factors in young adulthood: data from five cohorts in low- and middle-income countriesInternational Journal of Epidemiology, 2010
- Breastfeeding and later psychosocial development in the PhilippinesAmerican Journal of Human Biology, 2010
- Child development in a birth cohort: effect of child stimulation is stronger in less educated mothersInternational Journal of Epidemiology, 2009
- Quantifying the urban environment: A scale measure of urbanicity outperforms the urban–rural dichotomySocial Science & Medicine (1982), 2007
- Size at birth and growth trajectories to young adulthoodAmerican Journal of Human Biology, 2007
- Cohort Profile: Mandela's children: The 1990 birth to twenty study in South AfricaInternational Journal of Epidemiology, 2007
- Effect of breast feeding on intelligence in children: prospective study, sibling pairs analysis, and meta-analysisBMJ, 2006
- Relation of Serial Changes in Childhood Body-Mass Index to Impaired Glucose Tolerance in Young AdulthoodThe New England Journal of Medicine, 2004
- Alternatives for logistic regression in cross-sectional studies: an empirical comparison of models that directly estimate the prevalence ratioBMC Medical Research Methodology, 2003