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Smoking Marijuana While Breastfeeding

Medically Reviewed by Michelle Roth, BA, IBCLC
Will smoking doobies hurt your boobies?

Do you like to smoke weed and are wondering if it means you should stop breastfeeding?

When you are breastfeeding, you want to know what is safe for you to do and what you need to avoid. It is best to educate yourself before engaging in a behavior or activity that could potentially be dangerous.

If you are breastfeeding and considering smoking weed, this is what you should know so that you can make an informed decision for you and your baby.

Will Marijuana Affect Your Milk?

There have been numerous studies conducted that report smoking weed will affect breast milk and it can have potential side effects on your baby (1).

Marijuana is a fat-loving drug – meaning it’s attracted to and stored in your fat cells for a long time (unlike other water-loving drugs that are eliminated more readily in your urine). One of the major issues with breastfeeding is that breastmilk is fatty – so the THC and other chemicals may persist and be easily transferred to your baby via breastmilk.
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Editor's Note:

Michelle Roth, BA, IBCLC

Only a small percentage of your dose crosses into the breastmilk, but it is enough your baby will test positive for the drug for weeks. In one study of a mother who smoked weed heavily, her breast milk had 8 times the amount of marijuana than her own blood did. A 2018 study showed that exclusively breastfed babies got 2.5% of the maternal dose through breastfeeding (2).

The use of marijuana is also known to decrease milk production for the mother. If you are hoping to breastfeed exclusively, smoking marijuana could make this challenging.

The THC in marijuana can suppress the production of prolactin, the milk-making hormone, which can directly affect your milk supply and your mothering (3).

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How Does Marijuana Affect Your Baby When Breastfeeding?

The struggle with breastfeeding and smoking weed is that there is a lack of research regarding the topic fully. Marijuana isn’t legal everywhere, so the studies conducted are limited.

When you breastfeed, you are advised that everything you eat can cross into the milk and into your baby. Some babies can become fussy if mom eats something that upsets the baby’s stomach.

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Babies are much smaller, so they have a much smaller tolerance. Although only a percentage of marijuana crosses into breast milk, it only takes a small percentage to impact your baby. Your baby will be vulnerable to the chemicals and toxins.

If your baby experiences lethargy and sleeps far more often, this could lead to slow weight gain and possibly hindered development because your baby will not be awake and eating often enough.

When a mother breastfeeds and smokes weed, her baby can experience slower developmental growth. The major concern with marijuana is it affects the neural receptors in the brain that are important for development. A baby experiences rapid brain growth in the first year of life, so there is potential marijuana can stunt this process (4).

There have been some studies that have shown no long-term brain impairments, but there have been other studies showing infants exposed to marijuana had decreased motor development, among other long-term outcomes.

It is important to note many of these studies were conducted in the 1980s. Cannabis has since increased the levels of THC, meaning the potential side effects can now be much worse (5).

It has also been found that breastfed babies whose mothers smoke weed have an increased risk of dying from SIDS (Sudden Infant Death Syndrome). The risk factor is almost doubled from the risk of a non-smoking mother. The SIDS risk is also increased if the baby is exposed to secondhand smoke.

There are other risks associated with breastfeeding and marijuana smoking that include:

  • Hyperactivity: There is enough evidence that suggests the use of marijuana when breastfeeding can cause your baby to exhibit hyperactive behavior and potentially develop ADHD ( Attention Deficit Hyperactivity Disorder).
  • Emotional dysregulation: The active ingredient in marijuana is THC, and this has been believed to cause long-lasting emotional instability in children.
  • Later drug use risk: There is little evidence supporting this, but it is believed early exposure to drugs and drug use can cause children to seek out drugs, and potentially harder ones in the future (6).

Is Occasional Weed Smoking Safe?

Breast milk is known to be better for your baby than any formula, but is it still worth it if you smoke? It is still in your baby’s best interest if you avoid smoking altogether. If a mother occasionally or rarely smokes, however, it is possible the benefits from breast milk will outweigh the negative effects of smoking weed.

Some babies are allergic to many components in formula, so breast milk is their best option. If the benefits of breastfeeding your baby while smoking outweighs the negative aspects of formula, it may be worth it.

Consequences of Breastfeeding and Smoking Weed

Smoking and breastfeeding can actually lead to possible jail time or abuse charges. Many child protection agencies consider exposing your baby to this drug as abuse or child endangerment. No matter the trace amount, charges can be administered. Know the laws where you live before taking any chances.

Take Note

The use of marijuana is not limited to just smoking. Any use of marijuana whether smoked or ingested can be harmful to your baby. Pumping and dumping are also not effective because the effects of marijuana stay in your system and will travel through your milk for extended periods of time, not just one feeding session.

The Bottom Line

Need to know more about breastfeeding and marijuana use? These resources may help:

Breastfeeding is the best option of nutrition you can give your baby, but sometimes it should be avoided.

There is little research regarding smoking weed and breastfeeding, but there are cases that have shown negative results. Your baby could go unaffected, but there is always the chance something irreversible could occur.

Marijuana affects neural receptors, and no mother should knowingly expose their baby to something that has the potential to cause harm to baby’s developing brain.

Even though there have been cases where babies were unharmed, most babies still show traces of the drug in their urine. This means the drug is crossing into the breast milk and entering your baby’s system.

If you feel like you have to smoke, don’t breastfeed, and don’t smoke around your baby. Make sure someone else is around to help take care of your baby in case your behavior becomes affected.

Headshot of Michelle Roth, BA, IBCLC

Medically Reviewed by

Michelle Roth, BA, IBCLC

Michelle Roth, BA, IBCLC is a writer, editor, and board-certified lactation consultant for two busy pediatric practices. She is a former La Leche League Leader, Lamaze Certified Childbirth Educator, and Certified Infant Massage Instructor.