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Prenatal antimicrobial use and early-childhood body mass index

Abstract

Background/Objectives:

Growing evidence suggests that antibiotic use is associated with childhood body mass index (BMI), potentially via mechanisms mediated by gut microbiome alterations. Less is known on the potential role of prenatal antimicrobial use in offspring obesity risk. We examined whether prenatal antibiotic or antifungal use was associated with BMI at the age of 2 years in 527 birth cohort participants.

Methods/Subjects:

Antimicrobial use was obtained from the prenatal medical record. Height and weight were measured at the age of 2 years. Overweight/obesity was defined as a BMI 85th percentile.

Results:

A total of 303 (57.5%) women used antibiotics and 101 (19.2%) used antifungals during pregnancy. Prenatal antifungal use was not associated with child BMI at the age of 2 years. In the fully adjusted model, prenatal antibiotic use was associated with a 0.20±0.10 (P=0.046) higher mean BMI Z-score at the age of 2 years. Associations between prenatal antibiotic use and childhood BMI varied by trimester of exposure, with first or second-trimester exposure more strongly associated with larger BMI at the age of 2 years for both BMI Z-score (interaction P=0.032) and overweight/obesity (interaction P=0.098) after covariate adjustment.

Conclusions:

Prenatal antibiotic, but not antifungal, use is associated with larger BMI at the age of 2 years; associations were stronger for antibiotic exposures in earlier trimesters. Future studies examining whether these associations are due to alterations in the maternal and/or infant microbiome are necessary. Children who are overweight at the age of 2 years are at higher risk for being overweight as they age; prenatal antibiotic use is a potentially modifiable exposure that could reduce childhood obesity.

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Acknowledgements

This study was supported by the National Institutes of Health (R01 AI050681, R01 HL113010, R01 HD082147 and P01 AI089473) and the Fund for Henry Ford Hospital.

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Correspondence to A E Cassidy-Bushrow.

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Cassidy-Bushrow, A., Burmeister, C., Havstad, S. et al. Prenatal antimicrobial use and early-childhood body mass index. Int J Obes 42, 1–7 (2018). https://doi.org/10.1038/ijo.2017.205

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