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Almost one in every 20 pregnant women self-reports marijuana use during pregnancy. During the COVID-19 pandemic, this number has risen to 1 in 6 pregnant women. Some of the main factors associated with cannabis use during pregnancy and lactation are management of chronic conditions, sensation-seeking, dealing with stress, and other conditions related to pregnancy. The action of cannabis on endocannabinoid receptors might cause poor blastocyst implantation, inhibition of decidualization, compromised placentation, miscarriage and poor embryo development.The children born to mothers who used cannabis during pregnancy manifested higher aggression, anxiety, hyperactivity, and higher levels of the hormone cortisol, compared to children of non-cannabis users. In this review we summarize the effects of cannabis use on fetal development during the COVID-19 pandemic based on the existing published peer-reviewed scientific literature. The COVID-19 pandemic has served as an additional stimulus that has increased cannabis use among pregnant women. Prenatal cannabis use is associated with health risks for the mother and child. Cannabis use in pregnant mothers is associated with low infant birth weight and potential negative neurodevelopmental effects in the offspring. It remains unclear how long these changes will persist in the affected children. It is essential that clinicians educate pregnant women about the harm of prenatal cannabis use, improve strategies to support women at risk, and create new intervention strategies to help them stop using cannabis., Competing Interests: Conflict of interests: The authors declare no conflicts of interest., (Copyright © 2022, Agolli A et al., Applied Systems and Discoveries Journals.)