Preterm and Early-Term Delivery After Heat Waves in 50 US Metropolitan Areas

Published on June 7, 2024

Question: Are heat waves associated with increased rates of preterm birth and early-term birth in the US?

Findings: In this cohort study of 53 million births, daily rates of preterm and early-term births were positively associated with heat waves, with stronger associations observed after heat waves of longer duration and higher mean temperatures.

Meaning: This study suggests that the increasing frequency and intensity of heat waves have implications for perinatal health in the US.

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