Every major medical organization that issues guidance on cannabis and pregnancy reaches the same conclusion: do not use cannabis while pregnant or breastfeeding. There is no known safe amount, no safe trimester, and no safe product form.
what does cannabis do to a fetus
What the Guidelines Say
The American College of Obstetricians and Gynecologists (ACOG) advises against cannabis use in pregnancy and lactation. The Centers for Disease Control and Prevention (CDC) states that cannabis use during pregnancy is linked to low birth weight and preterm birth. The American Academy of Pediatrics (AAP) recommends against breastfeeding while using cannabis. These positions apply to all forms, including edibles, vapes, tinctures, and topicals that contain THC.
Why the Guidance Is Consistent
THC crosses the placenta and reaches the fetus. Research links cannabis use in pregnancy to:
- Lower birth weight
- Preterm birth
- Longer-term attention and learning problems
- Stillbirth in some studies
Because cannabis is not regulated like medication in most states, potency varies by product and batch. A product labeled low dose can still deliver enough THC to affect fetal development.
Cannabis and Pregnancy Breastfeeding: What Medical Guidance Says
If You Use Cannabis and Are Pregnant
Follow these steps in order.
- Stop using cannabis.
- Tell your obstetric provider or midwife that you use cannabis and need help stopping.
- Ask for a referral to a maternal-fetal medicine specialist or addiction medicine doctor if you need more support.
- Attend all prenatal appointments.
- Avoid replacing cannabis with alcohol, tobacco, or unregulated herbal products.
After Birth and While Breastfeeding
THC passes into breast milk. The AAP and ACOG advise against breastfeeding if you use cannabis. If you are struggling with nausea, anxiety, or sleep after birth, tell your provider. There are pregnancy-safe and breastfeeding-safe options for many symptoms.
Talking With Your Provider
Many people worry about judgment or legal consequences. Your provider's first goal is your health and the baby's health. Be direct about what you use, how much, and how often. That information changes the care you receive.
Summary
Guidelines from ACOG, CDC, and AAP are clear: no cannabis in pregnancy or while breastfeeding. If you need help stopping, ask your provider. Do not wait until the next appointment if you are using daily.