Cannabis use during pregnancy is one of the most common questions raised in prenatal visits, and the guidance from major medical organizations is consistent: it is not recommended in any amount, at any stage, or in any form. THC crosses the placenta, so what a parent uses can reach the developing baby. If you are pregnant, trying to conceive, or breastfeeding, the safest choice is to avoid cannabis and to tell your provider about any use so they can support you without judgment.
Key Risks at a Glance
- Lower birth weight and a higher chance of preterm birth.
- Possible effects on brain and nervous system development, including attention and learning differences later in childhood.
- Greater likelihood of NICU admission or need for breathing support after birth.
- THC detected in umbilical cord blood and fetal tissue following maternal use.
- Smoked cannabis adds carbon monoxide and tar, which reduce oxygen delivery to the baby.
- THC passes into breast milk and can accumulate in a nursing infant.
- No safe dose, strain, or trimester has been established by researchers.
- Unregulated products may contain contaminants, pesticides, or potency that does not match the label.
What the Evidence Shows
Observational studies link prenatal cannabis exposure to smaller birth size, preterm delivery, and longer-term differences in behavior and attention. Because researchers cannot ethically assign pregnant people to use cannabis, the evidence comes from population studies. Those studies cannot prove cause and effect on their own, but they consistently point in the same direction. Potency matters too: today's concentrates and edibles can deliver far more THC than the products studied decades ago, and labels on unregulated items are often inaccurate. CBD is not a proven alternative either, since many CBD products contain THC and purity varies widely from brand to brand.
Does cannabis help with pregnancy nausea?
There is no reliable evidence that cannabis treats nausea better than approved options, and the added risks are not worth it. Ask your provider about medications and approaches that are considered safe during pregnancy.
health impacts of cannabis on pregnancy
Can I use CBD instead of THC while pregnant?
No major health agency recommends CBD during pregnancy. Products sold online are not tested for pregnancy safety and may contain THC or other contaminants.
health impacts of cannabis on pregnancy
What if I used cannabis before I knew I was pregnant?
Early use before a positive test is not a reason to panic, but stopping now matters. Tell your provider so they can monitor your pregnancy and connect you with support.
If you need help cutting back, a prenatal provider, midwife, or confidential helpline can offer counseling and referrals. We are glad to share third-party lab results for every product we sell, and we encourage anyone pregnant or nursing to hold off and speak with their healthcare team first.