
In California, use of cannabis among mothers-to-be jumped from 4.2% to 7.1% from 2009 through 2016, the JAMA study found.
Yankey said that marijuana use during pregnancy may be linked to early labor and birth, stunted fetal growth, low birthweight and even stillbirth, but these associations are "still debatable, though these adverse effects lean more toward an increased likelihood of occurrence".
"Use among [pregnant] females younger than 18 to age 24 years increased the most", added the team led by Kelly Young-Wolff, a Kaiser researcher in Oakland.
In 2009, only about four percent of pregnant women were using marijuana.
The Kaiser Permanente researchers analyzed medical records from more than 30,000 pregnant women in its insurance network in California.
"More research is needed on how marijuana use during pregnancy could impact the health and development of infants", the USA government's National Institute on Drug Abuse stated on its website.
Читайте также: NBC looking to revive 'The Office'The American Congress of Obstetricians and Gynecologists recommends that "women who are pregnant or contemplating pregnancy should be encouraged to discontinue marijuana use" and "to discontinue use of marijuana for medicinal purposes in favor of an alternative therapy."Additionally, "there are insufficient data to evaluate the effects of marijuana use on infants during lactation and breastfeeding, and in the absence of such data, marijuana use is discouraged", according to the recommendations".
The study's authors said toxicology results show higher levels of marijuana than women disclosed in the survey, indicating women were under-reporting their marijuana use.
California became the first USA state to legalize medical marijuana in 1996.
"Tetrahydrocannabinol and cannabinoids (in marijuana) are known to affect how neurons migrate, and there is a lot of neuron migration as the fetus develops", Goler said.
Among ladies who screened positive for cannabis utilize, 55 percent fizzled the lab tests however denied sedate use on the polls.
Many women may not understand the potential risk, however. Marijuana use during pregnancy increased from 2.37 percent to 3.85 percent in 2014. "It does vary quite a bit, which makes it tricky", Young-Wolff said.
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