Forget common folklore about the safety of weed. Marijuana harms babies, research shows
- In 2019, researchers analyzed data from more than 450,000 pregnant women in the United States, aged 12 to 44, to examine trends and effects of marijuana use during pregnancy.
- This analysis followed a more than twofold increase in cannabis use between 2002 and 2017, mainly for recreational reasons during the first trimester.
- The study found that marijuana consumption during pregnancy is associated with a 52% increase in the likelihood of preterm birth, a 75% rise in the chances of delivering a baby with low birth weight, and a 29% greater risk of infant mortality.
- Dr. Jamie Lo, an obstetrician and lead author of the study, highlighted that a key result is the elevated likelihood of mortality occurring during pregnancy or shortly after birth.
- These findings suggest the need for improved clinical counseling and clearer public health messaging to address misconceptions about marijuana safety in pregnancy.
36 Articles
36 Articles

Marijuana Use While Pregnant Linked to Preterm Birth, Low Birth Weight
Key Takeaways
Smoking weed during pregnancy leads to low birth weight, poor development, early delivery, death: study
The research found that there was a 52 percent higher risk of preterm delivery before 37 weeks with marijuana use during pregnancy, and a 75 percent increase in risk of low birth weights under around 5.5 lbs.
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