Maternal Marijuana Use and Childhood Outcomes


Between four and five percent of pregnant women report some level of cannabis use. This level decreases markedly throughout pregnancy. Many women who report using cannabis during pregnancy do so to address symptoms of nausea/morning sickness.

Data to date is inconsistent with respect to whether in utero cannabis exposure is independently associated with low birthweight, pre-term birth, or other adverse neonatal outcomes (e.g., shorter gestational age)

In utero cannabis exposure is not independently associated with significant, consistent adverse effects on childhood development

  • “This research provides data on the development of 59 Jamaican children, from birth to age 5 years, whose mothers used marijuana during pregnancy. … The results show no significant differences in developmental testing outcomes between children of marijuana-using and non-using mothers except at 30 days of age when the babies of users had more favourable scores on two clusters of the Brazelton Scales: autonomic stability and reflexes. The developmental scores at ages 4 and 5 years were significantly correlated to certain aspects of the home environment and to regularity of basic school (preschool) attendance.”