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Extreme Heat Linked to Higher Rates of Preterm Births

New studies reveal that rising temperatures pose significant risks to pregnant women and their babies, with increased preterm births and health disparities.

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An illustration of a woman with a visibly pregnant belly kneeling on the ground looking up as a large sun shines ominously overhead
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Overview

  • Research analyzed 53 million births over 25 years, finding a 2% higher chance of preterm births after heat waves.
  • Black and Hispanic mothers, as well as those in lower socioeconomic groups, are more vulnerable to heat-related preterm births.
  • Extreme heat can trigger labor-inducing hormones, reduced blood flow, and dehydration, leading to early labor.
  • Climate change is causing more frequent, intense, and longer-lasting heat waves, exacerbating these risks.
  • Health experts call for better guidance and policies to protect pregnant women from heat stress.