The study looked at more than 53 million singleton births that occurred in the 50 most populous cities in the U.S. during the hottest months of the year. Looking back at heat waves between May and ...
One in 10 babies in the U.S. — nearly 374,000 infants — were born preterm in 2023, meaning before 37 weeks of pregnancy. More than 15% were very preterm, meaning they were born before 32 weeks. A full ...
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