As more and more states legalize marijuana for both medicinal and recreational use, many new parents are left wondering how their cannabis use may impact their breastfeeding routine. While the benefits of breastfeeding are well-known, some nursing mothers may feel conflicted about their personal marijuana use and its impact on their infant’s health.
When a person who is breastfeeding consumes marijuana, some of the cannabinoids (the active compounds in marijuana) can be transferred to breast milk. The amount and duration of transfer can depend on several factors, such as the frequency and amount of marijuana use, the mother’s metabolism, and the baby’s age and weight.
Research suggests that THC, the main psychoactive component of marijuana, can be detected in breast milk for up to six days after last use. However, the levels of THC in breast milk can vary depending on several factors, such as the frequency and amount of marijuana use. It’s also worth noting that the effects of marijuana on breastfeeding infants are poorly understood. Some studies suggest that exposure to THC through breast milk may affect a baby’s brain development and behavior, while others have not found significant effects.
Due to the potential risks, it’s generally recommended that breastfeeding mothers avoid using marijuana, or use it in moderation and wait several hours before breastfeeding. If a mother is concerned about the potential effects of marijuana on her baby, she should consult with a healthcare provider.
This is where the question arises- how long does marijuana stay in breast milk? The answer is not straightforward, as several factors are at play. However, understanding the basics of cannabis metabolism and its interactions with breast milk can help new moms make informed decisions about their cannabis use while breastfeeding. This article will explore the science behind marijuana in breast milk and provide tips for nursing mothers who consume cannabis.
Understanding THC in Breast Milk
The psychoactive component of marijuana, tetrahydrocannabinol (THC), is known to pass through breast milk from mother to infant. THC can be detected in breast milk as early as 20 minutes after smoking marijuana and can remain for up to 6 days after use. This means that even occasional marijuana use can significantly impact a nursing infant.
It’s important to note that THC in breast milk can affect an infant’s developing brain, leading to potential long-term cognitive and behavioral effects. THC can also be transferred through breast milk in higher concentrations than in maternal blood, as cannabinoids are highly lipophilic and can accumulate in breast milk’s fat content.
While there is still much to learn about the effects of THC exposure through breast milk, it’s clear that nursing mothers who use marijuana should exercise caution to protect their infant’s health.

Factors Affecting THC Concentration in Breast Milk
Several factors can affect the concentration of THC in breast milk. The most significant of these factors is the frequency and amount of marijuana use. Mothers who consume marijuana regularly are likely to have higher levels of THC in their breast milk than those who use marijuana less frequently.
Other factors affecting THC concentration in breast milk include the time between marijuana use and breastfeeding, the method of marijuana consumption, and the mother’s metabolism. For example, smoking marijuana can result in higher THC levels in breast milk than consuming edibles or using a vaporizer.
It’s also essential to note that THC’s concentration in breast milk may vary depending on the mother’s physiology and the potency of the marijuana consumed.
Studies on Marijuana and Breast Milk
Despite the widespread use of marijuana, there is still much to learn about the impact of THC exposure through breast milk. However, several studies have shed light on the topic.
A study published in the Journal of Pediatrics in 2018 found that THC can be detected in breast milk up to 6 days after marijuana use, with the highest concentrations found in the first few days after use. Additionally, the study found that THC exposure through breast milk can lead to developmental delays in infants.
Another study published in Obstetrics and Gynecology in 2019 found that marijuana use during breastfeeding was associated with decreased motor development and increased hyperactivity in infants.
While these studies provide valuable insights into the potential risks associated with marijuana use during breastfeeding, more research is needed to fully understand the long-term impact of THC exposure through breast milk.
Risks Associated with THC in Breast Milk
The risks associated with THC exposure through breast milk are still being studied. However, some potential risks have been identified.
Studies have suggested that THC exposure through breast milk can lead to infant motor and cognitive development delays. Additionally, THC exposure through breast milk has been associated with increased hyperactivity and decreased attention in infants.
It’s also essential to note that marijuana use during breastfeeding can impact milk production, potentially leading to decreased milk supply and nutritional deficits in infants.
While the risks associated with THC exposure through breast milk are still being studied, it’s clear that nursing mothers who use marijuana should exercise caution to protect their infant’s health.
How Long Does Marijuana Stay In Breast Milk?
The length of time that THC stays in breast milk can vary depending on several factors. However, THC can be detected in breast milk for up to 6 days after marijuana use.
It’s important to note that the concentration of THC in breast milk can vary depending on the mother’s individual physiology and the potency of the marijuana consumed. Additionally, the frequency and amount of marijuana use can impact the length of time that THC remains in breast milk.
Mothers who use marijuana should be aware that THC can be detected in breast milk for up to 6 days after use and should take precautions to protect their infant’s health.
Tips for Breastfeeding Mothers Who Use Marijuana
If you’re a nursing mother who uses marijuana, there are several steps you can take to protect your infant’s health.
First and foremost, it’s recommended that nursing mothers abstain from marijuana use while breastfeeding. However, if you choose to use marijuana, it’s essential to do so responsibly.
One important step is to avoid smoking marijuana, as smoking can result in higher THC concentrations in breast milk. Instead, consider using edibles or a vaporizer to reduce THC levels in breast milk.
It’s also important to time marijuana use carefully, ensuring that there is a significant amount of time between use and breastfeeding. Waiting at least 2 hours after marijuana use before breastfeeding can help reduce the amount of THC in breast milk.
Finally, consider discussing your marijuana use with your healthcare provider. Your provider can help you make informed decisions about your cannabis use while breastfeeding and can provide valuable support and resources to protect your infant’s health.

Legal Implications for Marijuana Use During Breastfeeding
The legal status of marijuana use during breastfeeding can vary depending on the state. In some states, marijuana use during breastfeeding is explicitly prohibited, while no specific laws address the issue in others.
It’s essential to be aware of the legal implications of marijuana use during breastfeeding in your state. Consider consulting with a legal professional if you have questions or concerns about the legality of your cannabis use while breastfeeding.
Alternative Options for Breastfeeding Mothers Who Use Marijuana
If you’re a nursing mother who uses marijuana but is concerned about the potential risks associated with THC exposure through breast milk, alternative options are available.
One option is to pump and store breast milk before using marijuana, ensuring that your infant consumes breast milk that is free from THC. Another option is to switch to formula feeding, giving your infant the nutrients they need without exposing them to THC.
Ultimately, the decision to continue breastfeeding while using marijuana is a personal one that should be made in consultation with your healthcare provider.
Conclusion
While the impact of THC exposure through breast milk is still being studied, it’s clear that nursing mothers who use marijuana should exercise caution to protect their infant’s health.
Understanding the basics of cannabis metabolism and its interactions with breast milk can help new moms make informed decisions about their cannabis use while breastfeeding. By taking precautions and working closely with their healthcare provider, nursing mothers who use marijuana can provide their infants with the care and nutrition they need while minimizing potential risks.