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Early child care and obesity at 12 months of age in the Danish National Birth Cohort

Abstract

Background/Objectives:

Evidence suggests that the child care environment may be more obesogenic than the family home, and previous studies have found that child care use may be associated with obesity in children. Few studies, however, have focused on child care during infancy, which may be an especially vulnerable period. This study examined child care use in infancy and weight status at 12 months of age in a country where paid maternity leave is common and early child care is not as prevalent as in other developed countries.

Subjects/Methods:

We studied 27 821 children born to mothers participating in the Danish National Birth Cohort, a longitudinal study of pregnant women enrolled between 1997 and 2002, who were also included in the Childcare Database, a national record of child care use in Denmark. The exposure was days in child care from birth to 12 months. The outcomes were sex-specific body mass index (BMI) z-score and overweight/obesity (BMI 85th percentile based on the World Health Organization classification) at 12 months. We conducted multivariable linear and logistic regression analyses examining child care use and weight outcomes.

Results:

A total of 17 721 (63.7%) children attended child care during their first year of life. After adjustment for potential confounders, a 30-day increment of child care was associated with a modestly higher BMI z-score at 12 months (0.03 units; 95% confidence interval (CI)=0.01, 0.05; P=0.003). Similarly, child care use was associated with increased odds of being overweight/obese at 12 months of age (odds ratio=1.05; 95% CI=1.01, 1.10; P=0.047).

Conclusion:

Child care in the first year of life was associated with slightly higher weight at 12 months, suggesting that child care settings may be important targets for obesity prevention in infancy.

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Acknowledgements

The Danish National Birth Cohort has been funded by the Danish National Research Foundation, Danish Pharmaceutical Association, Ministry of Health, National Board of Health, Statens Serum Institute, BIOMED, March of Dimes Birth Defects Foundation, Danish Heart Association, Danish Medical Research Council and Sygekassernes Helsefond. SEBN was supported, in part, by a grant from the National Institutes of Health (F32DK80618). EO was supported by grants from the National Institutes of Health (K24HD069408 and P03DK092924).

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Correspondence to S E Benjamin Neelon.

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Benjamin Neelon, S., Schou Andersen, C., Schmidt Morgen, C. et al. Early child care and obesity at 12 months of age in the Danish National Birth Cohort. Int J Obes 39, 33–38 (2015). https://doi.org/10.1038/ijo.2014.173

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