Marijuana Use During Pregnancy Linked To Autism In Babies, Study SaysPosted by On

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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.

“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.

The study did not capture the amount and type of marijuana the women used during pregnancy. Nor did the study know when during the pregnancy or how often women used it. And while the study could only show association, not cause and effect, researchers said they did their best to eliminate confounding factors.

Weed use during pregnancy growing

As weed becomes legalized and more socially acceptable, health care researchers worry that moms-to-be might think it’s fine to use to treat morning sickness or use recreationally, despite the lack of research on long-term impacts on a fetus.

Women also chose to use marijuana to avoid medications they felt were more harmful to their baby, such as anti-nausea pills, anti-psychotic medications and opioids, a small study of pregnant women by Washington State University researchers found.

Pain management, El-Chaâr said she hears from expecting mothers, is the most common reason for use of marijuana.

“It helps with different conditions that they may have or for nausea and vomiting in pregnancy,” El-Chaâr said. “Some people (said) they use (it) for sleep or for stress reduction. Still others use it recreationally; it’s just part of their routine.”

Use of marijuana by pregnant women has been growing in the United States in recent decades. An analysis last year of over 450,000 pregnant…

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