• Climate Central’s new global analysis shows that human-caused climate change has at least doubled the average number of pregnancy heat-risk days (extremely hot days associated with increased risk of preterm birth) in 222 countries from 2020 to 2024.
• In the U.S., climate change added 12 (48%) of the 25 average annual pregnancy heat-risk days experienced during the last five years.
• All 50 U.S. states and the District of Columbia experienced at least one additional week’s worth of pregnancy heat-risk days due to climate change, on average annually.
• Cities across the U.S. Southwest had the highest average number of pregnancy heat-risk days added by climate change.
• In addition to extreme heat, climate change-related extreme weather events put pregnant people at risk from air pollution, flooding, infrastructure damages, and prenatal stress.

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