What research shows about cannabis exposure during pregnancy and its effects on mothers, babies, and child development
Gestational cannabis exposure has been associated with impaired placental blood flow, smaller birth size, and potential longer-term neurodevelopmental and metabolic risks, though definitive evidence is still limited.
Quick Facts
What This Study Found
Cannabis use during pregnancy has been associated with increased risk of other substance use, impaired placental blood flow, small-for-gestational-age births, and potential childhood outcomes including increased risk of depression and ADHD. Maternal metabolic effects may include fatty liver, obesity, and gestational diabetes.
Key Numbers
THC potency has progressively increased over several decades; endometriosis affects approximately 10% of women (context for pain-driven use during pregnancy)
How They Did This
Narrative review examining epidemiological and clinical evidence on cannabis exposure during pregnancy and lactation, including effects on pregnancy outcomes, placental health, and child development.
Why This Research Matters
With cannabis legalization expanding and THC potency increasing, more pregnant women may use cannabis. Understanding the full range of potential risks is critical for informed decision-making.
The Bigger Picture
As cannabis becomes more accessible and socially acceptable, the gap between its widespread use and the limited evidence about prenatal exposure risks becomes increasingly concerning for public health.
What This Study Doesn't Tell Us
Much of the evidence is observational and cannot establish causation. Confounding factors (tobacco, alcohol, socioeconomic status) are difficult to fully control. Childhood and adolescent outcomes are sparsely assessed.
Questions This Raises
- ?Does CBD-only use during pregnancy carry the same risks as THC-containing products?
- ?How does increasing THC potency affect fetal exposure levels?
- ?What are the long-term cardiometabolic outcomes for children exposed in utero?
Trust & Context
- Key Stat:
- Associated with increased risk of small-for-gestational-age births
- Evidence Grade:
- Narrative review drawing on observational studies with significant confounding factors
- Study Age:
- Published in 2021. THC potency and cannabis formulations continue to change, potentially affecting prenatal exposure risks.
- Original Title:
- Association between gestational cannabis exposure and maternal, perinatal, placental, and childhood outcomes.
- Published In:
- Journal of developmental origins of health and disease, 12(5), 694-703 (2021)
- Authors:
- Ayonrinde, Oyekoya T, Ayonrinde, Oyedeji A, Van Rooyen, Derrick, Tait, Robert, Dunn, Mikaela, Mehta, Shailender, White, Scott, Ayonrinde, Oyekunle K
- Database ID:
- RTHC-02985
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
Is cannabis use during pregnancy safe?
Research has associated gestational cannabis exposure with several risks including impaired placental blood flow and smaller birth size, though definitive causal evidence is lacking due to the observational nature of most studies.
Can cannabis during pregnancy affect child development?
Limited evidence suggests associations with increased risk of depression and ADHD in childhood, as well as potential metabolic effects. However, long-term outcomes remain sparsely studied.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-02985APA
Ayonrinde, Oyekoya T; Ayonrinde, Oyedeji A; Van Rooyen, Derrick; Tait, Robert; Dunn, Mikaela; Mehta, Shailender; White, Scott; Ayonrinde, Oyekunle K. (2021). Association between gestational cannabis exposure and maternal, perinatal, placental, and childhood outcomes.. Journal of developmental origins of health and disease, 12(5), 694-703. https://doi.org/10.1017/S2040174420001166
MLA
Ayonrinde, Oyekoya T, et al. "Association between gestational cannabis exposure and maternal, perinatal, placental, and childhood outcomes.." Journal of developmental origins of health and disease, 2021. https://doi.org/10.1017/S2040174420001166
RethinkTHC
RethinkTHC Research Database. "Association between gestational cannabis exposure and matern..." RTHC-02985. Retrieved from https://rethinkthc.com/research/ayonrinde-2021-association-between-gestational-cannabis
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.