Clinical Edge

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Prepregnancy BMI & Infant Mortality

What are the risks?

Prepregnancy body mass index (BMI) was strongly related to infant mortality, neonatal and postneonatal, even after controlling for multiple risks. This according to a cohort study using data from 38 states and the District of Columbia with the BMI measure, including 6,419,836 singleton births and 36,691 infant deaths. The study concluded:

• The odds ratio for an infant death rose from 1.32 for mothers in the obese I category to 1.73 for obese III with normal prepregnancy weight as a reference.

• Higher BMI was related to higher rates of both neonatal and postneonatal mortality.

• Adjusted OR for the risk of an infant death among singleton, term, vertex births for those gaining less than the recommended weight was 1.07 and 1.04 for those gaining more than recommended.

Citation: Declercq E, MacDorman M, Cabral H, Stotland N. Prepregnancy body mass index and infant mortality in 38 US states, 2012-2013. [Published online ahead of print January 7, 2016]. Obstet Gynecol. doi: 10.1097/AOG.0000000000001241.