Quick answer
One-time cannabis use while breastfeeding is a low-risk event for most infants, but it is not risk-free. THC, the main psychoactive compound in marijuana, passes into breast milk. After a single use, THC can be detected in milk for up to 6 days. The safest approach is to pause breastfeeding for at least 24 hours after use. Then feed your baby pumped milk from before the use. Watch your baby for signs of drowsiness, poor feeding, or breathing changes. If you see any of these signs, call your pediatrician.
Do You Have to Pump and Dump If You Smoked Weed?
Prerequisites
Before you decide what to do, gather a few facts and supplies.
- Pumped breast milk from before you used cannabis, if you have it.
- A breast pump or hand expression method.
- A way to track your baby's feeding, diapers, and sleep.
- The phone number for your pediatrician or a nurse advice line.
What to do after a single use
- Stop breastfeeding for 24 hours from the time you used cannabis. This is a common recommendation from lactation experts, though THC may still be detectable in milk for up to 6 days after occasional use.
- Pump or hand express your milk every 3 to 4 hours during the pause. This keeps your supply up and prevents engorgement. You can discard this milk or store it for later if you choose. Some parents label it and use it after a longer wait, but there is no standard safe wait time for stored milk.
- Feed your baby your stored milk from before the use, or use formula for the next 24 hours. If you do not have stored milk, formula is a safe option for short-term use.
- Monitor your baby for the next 48 hours. Note any changes in feeding, alertness, or breathing.
- Call your pediatrician if you see any signs of concern. Do not wait for a scheduled visit.
What to watch for in your baby
THC can affect an infant's nervous system. Signs of exposure include:
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- Unusual sleepiness or trouble waking for feeds.
- Poor feeding or weak sucking.
- Breathing that is slower than normal or pauses.
- Poor weight gain or dehydration.
- Irritability or tremors.
When to call a doctor
Call your pediatrician or go to the emergency room if your baby has trouble breathing, cannot be woken for feeds, or has a blue tint around the lips. These are rare with a single exposure, but they need urgent care.
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How long THC stays in breast milk
THC binds to fat in breast milk. After a single use, levels peak around 1 hour after smoking. The compound can be detected in milk for up to 6 days, though the amount drops over time. With chronic use, THC can build up and stay in milk for weeks. That is why one-time use is different from regular use.
Lower-risk choices going forward
If you use cannabis for medical or recreational reasons, talk to your doctor about safer options during breastfeeding. Some providers suggest waiting 24 hours after any use. Others advise stopping altogether. The choice depends on your baby's age, health, and your milk supply. Convenience may drive cannabis use, but with a newborn, the stakes are higher. Plan ahead if you can.