Cannabis use while breastfeeding is not considered safe. THC, the main psychoactive compound in cannabis, passes into breast milk and can stay detectable in a baby's system for days. The CDC and the American Academy of Pediatrics advise against using cannabis, weed, or CBD products during breastfeeding because of possible harm to infant brain development, sedation, and feeding problems. There is no known safe amount.
How does THC get into breast milk?
THC is fat-soluble, so it collects in breast tissue and transfers into milk. It can often be detected in human milk for several days after one use and for weeks with daily or heavy use.
Smoking and vaping deliver the highest peaks, while edibles produce a slower but longer exposure. Milk storage, freezing, and pumping do not remove THC.
What are the risks to a breastfed baby?
- Sedation and drowsiness: babies may sleep more, feed poorly, or be harder to wake.
- Feeding and growth issues: poor latching and low intake can affect weight gain.
- Developmental concerns: THC exposure during brain growth is linked to subtle effects on attention and behavior, though long-term human milk data is limited.
- Smoke exposure: secondhand and thirdhand smoke irritate infant airways and are tied to higher SIDS risk.
- Impaired caregiving: cannabis can slow reaction time and judgment during night feeds.
Some mothers also report a drop in milk supply with heavy use, though the evidence is mixed.
Is CBD safe while breastfeeding?
No. CBD safety during lactation has not been established in human studies, so there is no reliable dose that can be called safe for a nursing baby.
CBD products are also loosely regulated. Many contain trace THC, and labels frequently do not match actual content, which means an unlabeled dose can still reach your baby.
I used cannabis before I realized the risk. What now?
Do not panic, and do not stop nursing abruptly without support. Stop cannabis use, watch your baby for excessive sleepiness, weak feeding, or unusual sluggishness, and call your pediatrician or a lactation consultant.
A poison control center can also answer urgent questions about infant exposure.
When can I use cannabis again?
Most clinicians suggest waiting until you have fully weaned. If you use cannabis after weaning, allow time before nursing a future baby and discuss timing with your provider.
What can I use instead for sleep, anxiety, or pain?
Ask your provider about breastfeeding-compatible options, including physical therapy, cognitive behavioral therapy, and approved medications. Avoid unregulated supplements and any CBD product marketed for lactation.
The safest choice during breastfeeding is to skip cannabis and CBD entirely and get individualized guidance from your clinician.