According to a report by CNN, more pregnant women are using marijuana.
Some of them are doing so as a way to cope with morning sickness or anxiety, our affiliate WKRC reported. The biggest jump in usage was seen in pregnant women under the age of 24, according to the report.
The study was published on Tuesday in the Journal of the American Medical Association.
One expert speculates that the rise might be explained in part by the increased availability of legal marijuana in recent years.
While the effects of marijuana on a fetus are unclear, doctors warn that it could lead to low birth weight and developmental problems.