Doctors have long known that heat puts a strain on the heart, kidneys and other organs. Those risks are exacerbated for pregnant people, as the body's processes for staying cool are altered.

It’s a problem that climate change , caused by the burning of fuels like gasoline and coal, is worsening. Intensifying extreme heat events, high temperatures well into the night and shattering weather records means more exposure for pregnant people , particularly in developing countries.

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