Climate change could hurt babies' hearts, study says

By Jen Christensen, CNN
Updated 5:07 AM ET, Wed January 30, 2019

Heat and pregnancy do not mix. High temps don't just make a pregnant woman uncomfortable, the heat can actually hurt the health of her baby -- and with climate change, this will probably become a bigger problem.

A study in Wednesday's Journal of the American Heart Association found that a larger number of babies will probably be born with congenital heart defects between 2025 and 2035 due to their mothers' exposure to higher temperatures, triggered by climate change, while pregnant. This especially holds true for moms who were pregnant through spring or summer. Climate change could result in as many as 7,000 additional cases of congenital heart defects in the United States over an 11-year period, according to the study. The Midwest will probably see the biggest percent increase, followed by the South and Northeast regions of the United States.

Earlier research found that climate change could "halt and reverse" progress made in human health over the past century, but there's more limited research on the impact that has on pregnancy, the authors said. Congenital heart defects are the most common type of birth defects and can hurt a baby's overall health and potentially impact how their body works or develops.

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This current research builds on earlier work that found when the temperature stays high, it can hurt a mother's chances of carrying a baby to term. Extreme heat also puts moms at risk to give birth early. Moms exposed to high heat have a bigger chance of having a baby that's small or underweight. Mothers who endure high temperatures early in their pregnancy have a much greater risk that their baby will have congenital heart problems, earlier research has found.

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