Abstract Background The rapid increase in cannabis use during pregnancy—up by 170 % between 2009 and 2016—raises pressing concerns about its effects on fetal health, particularly on the delicate monoamine system within the fetoplacental unit, which is crucial for placental function and neurodevelopment. Objective This systematic review explores the impact of prenatal cannabinoid exposure on the monoamine system within the fetoplacental unit, with a focus on its implications for fetal development through the lens of the Developmental Origins of Health and Disease (DOHaD) framework. Methods A comprehensive search across multiple databases initially retrieved 18,252 papers. After rigorous screening, only 16 animal studies and 4 human studies met the inclusion criteria. Findings were synthesized to evaluate the effects of...