Cannabis use during Pregnancy and Breastfeeding

Since the legalization of Cannabis (Marijuana), the Society of Obstetricians and Gynecologists of Canada continues to urge pregnant and breastfeeding clients against the use of Cannabis. 

Research suggests that 70% of pregnant and non-pregnant clients believe there is a slight-to-no risk of harm from using Cannabis once or twice a week during pregnancy; however, the active component of Cannabis, THC, crosses the placenta to the baby, and can also cross over into breast milk. 

There are potential adverse effects associated with Cannabis use during pregnancy and while breastfeeding. These short videos discuss the risks of using Cannabis during pregnancy.  You can find more detailed information at

The Centre of Excellence for Women’s Health recently released an evidence-based resource Taking Care: A Short Guide to Breastfeeding and Substance Use. Different ways of feeding your baby are honoured, with acknowledgement that exclusive breastfeeding is not always desirable or possible. This guide is also available in French.