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(CNN)In what they call the largest study ever done, researchers found using marijuana while pregnant may increase the risk that a child will develop autism.
“Women who used cannabis during pregnancy were 1.5 times more likely to have a child with autism,” said study author Dr. Darine El-Chaâr, a maternal fetal medicine specialist and clinical investigator at Ottawa Hospital Research Institute in Canada.
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Marijuana use during pregnancy linked to autism in babies, study says
By Sandee LaMotte, CNNUpdated 11:28 AM ET, Mon August 10, 2020
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Your brain on marijuana 01:39
(CNN)In what they call the largest study ever done, researchers found using marijuana while pregnant may increase the risk that a child will develop autism.
“Women who used cannabis during pregnancy were 1.5 times more likely to have a child with autism,” said study author Dr. Darine El-Chaâr, a maternal fetal medicine specialist and clinical investigator at Ottawa Hospital Research Institute in Canada.
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“These are not reassuring findings. We highly discourage use of cannabis during pregnancy and breastfeeding,” she said.
Past studies have shown the use of marijuana during pregnancy is linked to low birth weight, impulsivity, hyperactivity, attention issues and other cognitive and behavioral issue in children, according to the US Centers for Disease Control and Prevention. Pregnant women who use marijuana, one study found, have a 2.3 times greater risk of stillbirth.
“Based on that, I’m not too surprised by these findings,” El-Chaâr said. “Fetal brain development occurs throughout all gestational ages.”
The study, published Monday in the journal Nature, reviewed data from every birth in Ontario, Canada, between 2007 and 2012, well before recreational marijuana was legalized in Canada in 2017. Of the half a million women in that data pool, researchers then narrowed the study to 2,200 women who said they used only marijuana during pregnancy, without mixing it with tobacco, alcohol or opioids.