The study, published Monday in JAMA, used data from nearly 34,000 women who participated in an annual CDC-sponsored health surveillance survey about their drinking patterns. More than 1 in 7 women reported drinking during pregnancy in the 2023-2024 survey, up from fewer than 1 in 10 in 2011-2012. There is no safe amount of drinking alcohol use for pregnant women and all types of alcohol can harm the developing fetus, the CDC says. Binge drinking and heavy drinking were also strongly associated with tobacco use. Among the pregnant women reporting high-risk drinking, 68% said they also used tobacco.