Does THC Increase Breast Milk Supply?

The short answer to the question of whether THC increases milk supply is no. Current research actually suggests the opposite may be true. While some cultures have historically used cannabis seeds for lactation support, there is no scientific evidence that THC—the psychoactive component of cannabis—increases milk production. In fact, many studies indicate that cannabis use can lead to a decrease in milk supply.

To understand why this happens, we have to look at how milk is made. Milk production is a delicate hormonal dance. When that dance is interrupted by external substances, the rhythm of your supply can suffer. Most experts and organizations, including the American Academy of Pediatrics, recommend avoiding cannabis while breastfeeding due to these potential impacts on supply and infant development.

The Prolactin Connection

The primary reason THC is thought to decrease milk supply is its effect on prolactin. Prolactin is often called the "milk-making hormone." It is produced by the pituitary gland in your brain. Its main job is to tell your breasts to produce milk after your baby is born.

Studies in both humans and animals have shown that THC can interfere with the way the pituitary gland releases hormones. Specifically, it may suppress the production of prolactin. When your prolactin levels drop, your body may not receive the signal it needs to create an adequate milk supply.

This is especially critical in the early weeks of breastfeeding. This period is known as the "establishment phase." During this time, your body is learning how much milk to make based on hormonal signals and baby's demand. If prolactin is suppressed during this window, it could lead to a lower supply that is difficult to increase later.

Understanding the Let-Down Reflex

Another factor to consider is the let-down reflex. This is the process where milk is squeezed out of the milk ducts and toward the nipple so the baby can drink. This reflex is controlled by oxytocin, the "love hormone."

While some parents feel that cannabis helps them relax—which theoretically helps oxytocin flow—the chemical interference of THC can disrupt the overall hormonal balance. If the hormonal signals for milk production (prolactin) and milk release (oxytocin) are out of sync, your breastfeeding experience may become more challenging.

How THC Moves Through Your Body and Milk

One of the most important things for breastfeeding parents to understand is that THC is lipophilic. This is a scientific way of saying it is "fat-loving." It dissolves in fat and is stored in the fatty tissues of your body.

Your breasts are largely made of fatty tissue, and breast milk itself has a high fat content. Because THC loves fat, it is drawn into your breast milk in relatively high concentrations. Research has shown that the concentration of THC in breast milk can be significantly higher than the concentration in the mother's bloodstream.

The Problem with the "Pump and Dump" Method

Many parents are familiar with the "pump and dump" method used for alcohol. With alcohol, the substance leaves your milk as it leaves your bloodstream. This is because alcohol is water-soluble.

THC is different. Because it is stored in your fat cells, it stays in your system for a very long time. It does not simply disappear a few hours after use. Studies have found that THC can be detected in breast milk for anywhere from six days to over six weeks after the last use.

Key Takeaway: Because THC is stored in body fat, "pumping and dumping" does not work to clear it from your milk. It remains in your system and your milk for days or even weeks.

No Predictable Peak

With substances like caffeine or alcohol, we can usually predict when the concentration will be highest in your milk. THC does not follow these rules. A study led by Washington State University found that there was no consistent time when THC concentrations peaked in breast milk. For some, it peaked 30 minutes after use. For others, it took several hours. For regular users, the levels in the milk stayed consistently high throughout the day.

Potential Risks to the Nursing Infant

When you consume THC, your baby also consumes it through your milk. Because an infant's brain is rapidly developing, there are concerns about how this exposure might affect them.

The research into the effects of THC on nursing infants is still growing, but some studies have raised red flags. Some of the potential risks include:

Sedation and Weakness: Infants exposed to high levels of THC may appear lethargic or have poor muscle tone.
Poor Feeding: A sleepy or sedated baby may not latch well or stay awake long enough to get a full feeding. This can further decrease your milk supply because the breast is not being emptied effectively.
Motor Development: One study found that infants exposed to cannabis through breast milk in the first month of life showed a slight decrease in motor development at one year of age.
Long-term Brain Development: There are ongoing concerns about how cannabinoids interact with a baby's developing endocannabinoid system, which helps regulate the nervous system.

While the amount of THC transferred to the infant is relatively small—estimated at about 2.5% of the maternal dose in some studies—the fact that it accumulates in the baby's own fat stores means the exposure is constant rather than one-off.

Addressing the Reasons for Use

We understand that many parents who use cannabis are not doing it for "fun." Many use it to manage genuine challenges like postpartum anxiety, chronic pain, or extreme sleep deprivation. We hear you, and we know that these struggles are real.

If you are looking for ways to relax or manage the stress of new motherhood without affecting your supply or exposing your baby to THC, there are other paths. At Milky Mama, we always advocate for a holistic approach to wellness. This includes:

Professional Support: Talking to a therapist who specializes in postpartum mental health.
Lactation Consultation: Working with an IBCLC to address supply concerns directly.
Physical Rest: Prioritizing sleep whenever possible, even if it means asking for extra help from a partner or friend.
Nutrition and Hydration: Eating nourishing foods and staying hydrated to support your body's natural processes.

For one-on-one guidance, our certified lactation consultant breastfeeding help can help you work through supply concerns, pumping challenges, and other breastfeeding obstacles. Our supplements are designed to support your body using traditional herbs that have been used by breastfeeding parents for generations. For example, our Lady Leche™ and Pumping Queen™ supplements are crafted to help support a healthy milk supply through natural, plant-based ingredients.

Evidence-Based Ways to Actually Increase Supply

If you are worried about your supply, the best thing you can do is focus on the "supply and demand" principle. This is the gold standard for milk production. The more milk is removed from the breast, the more milk your body will make.

Frequent Removal

Ensure your baby is nursing frequently—at least 8 to 12 times in a 24-hour period. If you are pumping, try to maintain a consistent schedule. Each time the breast is emptied, it sends a signal to your brain to make more.

Skin-to-Skin Contact

Spending time skin-to-skin with your baby is a powerful way to boost oxytocin. This helps with your let-down reflex and can naturally improve the flow of milk. It also helps calm both you and your baby, which can reduce the stress that often leads people to consider cannabis in the first place.

Power Pumping

If you need an extra boost, power pumping can mimic a baby’s cluster feeding. This involves pumping for 20 minutes, resting for 10, pumping for 10, resting for 10, and pumping for a final 10 minutes. This intense session tells your body that the "demand" has increased, which usually results in an increased "supply" over the next few days. If you want more support around pumping routines, our guide on pumping and breastfeeding is a helpful next read.

Support Your Body with Lactation Treats

Sometimes, you just need a little extra nourishment. Our Emergency Brownies are a fan favorite for a reason. They are packed with ingredients like oats, brewer's yeast, and flaxseed, which many moms find helpful for supporting their supply. Plus, they provide a much-needed delicious snack during those late-night feeding sessions.

We also offer hydration support through our lactation drinks. Products like Pumpin Punch™ or Milky Melon™ can help you stay hydrated while providing lactation-supportive ingredients. If you want to browse more options, our lactation drink mixes collection makes it easy to compare your favorites. Hydration is essential for milk production, and these drinks make it easy to get what you need.

The Legal and Safety Landscape

It is also important to consider the legal implications of THC use while breastfeeding. Even in states where cannabis is legal, healthcare providers may be required to report positive drug tests in infants. This can lead to complications with social services that no parent wants to navigate.

Furthermore, if you are using cannabis to the point of impairment, it can affect your ability to care for your baby safely. It can lead to deeper sleep, which increases the risk of accidents if you are co-sleeping or bed-sharing. We always recommend having a sober caregiver present if you have consumed any substance that might impair your judgment or reaction time.

Moving Forward with Confidence

Breastfeeding is a journey filled with ups and downs. If you have used cannabis and are worried about your supply or your baby, please know that you are doing your best. Every drop counts, and your well-being matters just as much as your milk supply.

If you are struggling with low supply, focus on the tools that have been proven to work. Reach out to a certified lactation consultant, focus on frequent milk removal, and nourish your body with high-quality foods and supplements. We are here to walk this path with you, providing the support and education you need to reach your breastfeeding goals. If you prefer a structured learning path, our Breastfeeding 101 course can help you build confidence and learn the basics.

Next Steps for Success:

Consult with a lactation professional to rule out latch or health issues.

Focus on skin-to-skin contact to boost your natural "love hormones."

Incorporate lactation-supportive foods like oats and brewer's yeast.

Prioritize your mental health through safe, evidence-based methods.

Conclusion

While the idea that THC might help you relax or boost your supply is common in some online spaces, the clinical evidence does not support it. THC may actually decrease your milk supply by suppressing the hormone prolactin. Because it is stored in body fat, it remains in your breast milk for a long time, potentially affecting your baby's development. At Milky Mama, we want you to feel empowered and informed. By focusing on frequent milk removal, skin-to-skin contact, and proper nutrition, you can support your supply safely and effectively. For more practical supply strategies, our article on what helps produce milk supply is a great companion read.

THC can lower prolactin levels, which are necessary for making milk.
Cannabis is fat-soluble and stays in breast milk for days or weeks.
Evidence-based methods like power pumping and skin-to-skin are safer ways to boost supply.

You’re doing an amazing job, and we are here to support you every step of the way. If you’re looking for a natural way to support your supply, consider trying our lactation snacks collection or exploring our full lactation supplements collection.

FAQ

Does smoking weed help with milk let-down?

While some people feel that cannabis helps them relax, which can theoretically help with a let-down, there is no evidence that it improves the reflex. In fact, the hormonal disruption caused by THC may interfere with the overall balance of prolactin and oxytocin needed for efficient breastfeeding. It is much safer to use methods like warm compresses or skin-to-skin contact to encourage a let-down.

How long does THC stay in breast milk?

THC is stored in the fat cells of the body and is released slowly over time. Studies have shown that it can be detected in breast milk for anywhere from 6 days to 6 weeks after the last use, depending on how often it was consumed. This means that "pumping and dumping" for a few hours is not an effective way to clear THC from your milk.

Can I use CBD oil instead of THC while breastfeeding?

While CBD does not have the psychoactive effects of THC, there is still very little research on its safety during breastfeeding. Like THC, CBD is fat-soluble and likely transfers into breast milk. Most health organizations, including the FDA, recommend that breastfeeding parents avoid CBD products until more research is available.

Will one-time use of cannabis dry up my milk?

$28.80 AUD

Subscribe & Save: 10% off

SHOP NOW

Your cart is empty

Your cart

Estimated total

About Milky Mama

Support

Stay Connected

Does THC Increase Breast Milk Supply?

Table of Contents

Introduction