Research has found that some children born to mothers who used marijuana during their pregnancy can have subtle brain changes that can cause problems with memory, attention, and problem-solving skills.
There may be other ways that the fetus is affected by marijuana use, but many of the women involved in previous research studies also smoked cigarettes and/or drank alcohol, making it difficult to determine what substance caused which effects to their children.
The National Institute on Drug Abuse says more research is needed to determine exactly what effects marijuana use has on the unborn child.
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National Institute on Drug Abuse. "Marijuana." DrugFacts Updated January 2014
National Institute on Drug Abuse. "Want to Know More?- Some FAQs about Marijuana." Marijuana: Facts for Teens Updated October 2013
National Institute on Drug Abuse. "Marijuana." Research Report Series Updated July 2012
The Partnership at DrugFree.org. "Marijuana." Drug Guide. Accessed April 2014.