Cannabis in Pregnancy: What Moms Need to Know

For generations, pregnant women have been told to avoid everything from soft cheese to coffee, creating a culture of restriction and fear around pregnancy choices. Yet thousands of mothers quietly turn to cannabis for relief from severe nausea, anxiety, and pain during pregnancy—often feeling isolated and judged for a decision made out of desperation, not recklessness. 

At Society Plant, our founder, Bianca, hears from mothers navigating these impossible choices every day: women who tried every pharmaceutical option, who vomited 15 times a day, who couldn't function without relief. This is not a blog endorsing cannabis use during pregnancy. This is an educational exploration of why some mothers make this choice, what limited research exists, and why the conversation around cannamoms has become a movement for normalizing honest conversations about maternal health.

The reality is that pregnant women face an impossible bind: severe symptoms that impact their ability to eat, work, or care for existing children, versus limited treatment options and conflicting medical advice. Understanding the research—both the risks and the gaps in our knowledge—is essential for mothers making informed decisions about their bodies and pregnancies.

Cannabis During Pregnancy: Understanding the Research Landscape

The conversation around cannabis use during pregnancy exists in a research vacuum. Most studies on cannabis and pregnancy are observational, meaning they cannot establish cause and effect. They compare women who used cannabis during pregnancy to those who did not, but cannot account for all the variables that differ between these groups—socioeconomic factors, nutrition, prenatal care access, use of other substances, and underlying health conditions.

Why Research on Cannabis and Pregnancy Is Limited

Conducting controlled studies on pregnant women is ethically complex. Researchers cannot randomly assign pregnant women to use cannabis to measure outcomes. This means most of what we know comes from self-reported use in large population studies, which have significant limitations. Women may underreport cannabis use due to stigma or fear of legal consequences. Studies often cannot distinguish between different types of cannabis products, doses, or frequency of use. The cannabis available today is also dramatically different in potency from what was studied decades ago.

What Current Medical Guidelines Say

Major medical organizations including the American College of Obstetricians and Gynecologists (ACOG) recommend against cannabis use during pregnancy based on the precautionary principle: when we do not have definitive safety data, the recommendation is to avoid exposure. This is a standard approach to pregnancy guidance. However, this same precautionary principle has been applied to countless substances later proven safe, and has sometimes left women without adequate treatment options for debilitating pregnancy symptoms.

The Gap Between Medical Advice and Maternal Reality

Hyperemesis gravidarum—severe pregnancy nausea that can lead to hospitalization, dehydration, and inability to function—affects up to 3% of pregnancies. Many pharmaceutical anti-nausea medications carry their own risks or prove ineffective. Some women report that cannabis is the only thing that allowed them to eat, work, and care for their families during pregnancy. The question becomes: what is the greater risk? These are the conversations happening in cannamom communities every day.

Why Do Some Mothers Use Cannabis During Pregnancy?

Understanding why some women turn to cannabis during pregnancy requires acknowledging the severity of symptoms many experience and the limitations of conventional treatments. This is not about recreational use—mothers report using cannabis as a medical intervention when other options have failed.

Severe Nausea and Hyperemesis Gravidarum

The most commonly cited reason for cannabis use during pregnancy is nausea relief. Women with hyperemesis gravidarum describe vomiting 20-30 times per day, losing dangerous amounts of weight, and being unable to keep down water. Prescription anti-nausea medications like Zofran and Phenergan work for some, but not all women. Some experience severe side effects from these medications. For women who have found no relief through conventional medicine, cannabis represents a choice between suffering that threatens the pregnancy itself versus using a substance with uncertain risks.

Anxiety and Mental Health Support

Pregnancy can exacerbate existing anxiety disorders or trigger new onset anxiety, particularly in women with previous pregnancy loss or trauma. Many psychiatric medications carry known risks during pregnancy, leaving women to choose between untreated mental health conditions and medication exposure. Some women report using small amounts of CBD or low-dose THC to manage anxiety when other options felt more dangerous or ineffective. The mental health of the mother directly impacts fetal development—chronic stress and untreated anxiety have documented negative effects on pregnancy outcomes.

Chronic Pain and Medical Conditions

Women with chronic pain conditions, autoimmune disorders, or other medical needs do not stop having these conditions when they become pregnant. Opioids, NSAIDs, and many other pain medications carry significant risks during pregnancy. Some women with conditions like endometriosis, fibromyalgia, or inflammatory bowel disease report that cannabis is the only treatment that has allowed them to function without the risks associated with their usual pharmaceutical regimen.

What Does the Jamaican Study on Cannabis and Pregnancy Show?

The most frequently cited research suggesting cannabis may not harm pregnancy outcomes is a 1994 study by Dr. Melanie Dreher examining traditional cannabis use among pregnant women in Jamaica. This study is often referenced in cannamom communities, but its findings and limitations deserve careful examination.

The Dreher Study: Design and Findings

Dr. Dreher's research followed 44 Jamaican women—24 who used cannabis during pregnancy and 20 who did not. The women who used cannabis consumed it primarily as a tea, typically in the third trimester, and reported using it for nausea, stress relief, and to increase appetite. Researchers assessed the babies at birth, one month, and five years of age. The study found no significant differences in birth weight, length, head circumference, or Apgar scores between babies exposed to cannabis and those who were not. At one month, babies exposed to cannabis actually scored slightly higher on certain measures of autonomic stability and reflexes, though these differences were small.

Important Limitations of the Jamaican Research

While this study provides interesting data, it has significant limitations that prevent it from being definitive. The sample size was very small—44 women total. The women who used cannabis differed from those who did not in many ways beyond cannabis use: they tended to have better nutrition, more social support, and different overall health profiles. The study could not control for all these confounding variables. The cannabis consumed was in tea form, likely resulting in lower THC exposure than smoking or modern high-potency products. The cultural context—where cannabis use was normalized, and stigma was lower—may have reduced stress-related confounding factors present in populations where use is criminalized.

What the Jamaican Study Does and Doesn't Tell Us

The Dreher study suggests that in one specific population, with one specific pattern of use, researchers did not detect harm. It does not prove that cannabis is safe during pregnancy. It does not account for modern high-potency products, different routes of administration, or use during different stages of pregnancy. However, it does challenge the assumption that any cannabis exposure will inevitably cause harm, and it highlights how much we still do not know. The study's most important contribution may be demonstrating the need for more research rather than definitive answers about safety.

Here is a five-year follow-up of the Jamaican children whose mothers used marijuana during pregnancy. 

What Are the Potential Risks of Cannabis Use During Pregnancy?

While research has limitations, there are documented concerns about cannabis exposure during pregnancy that deserve serious consideration. Being informed about potential risks is essential for any mother weighing this decision.

Lower Birth Weight and Preterm Birth Associations

Several large observational studies have found associations between cannabis use during pregnancy and slightly lower birth weight—typically a reduction of 3-4 ounces on average. Some studies have also found small increases in preterm birth rates. However, these studies cannot prove causation. Women who use cannabis during pregnancy may differ in other ways that affect birth outcomes: socioeconomic factors, nutrition, stress levels, use of tobacco or other substances, and access to prenatal care. When researchers control for these factors, the associations often become weaker or disappear, suggesting confounding variables may explain much of the observed effect.

Potential Neurodevelopmental Effects

The developing fetal brain has cannabinoid receptors, and THC crosses the placenta. This has raised concerns about potential impacts on brain development. Some studies have found associations between prenatal cannabis exposure and subtle differences in executive function, attention, and impulse control in children. However, these studies face the same confounding variable problem—they cannot isolate the effect of cannabis from dozens of other factors. Long-term studies following children into adolescence have shown mixed results, with some finding no lasting effects and others suggesting subtle differences that may or may not be clinically significant.

The Challenge of Isolating Cannabis Effects

One of the biggest challenges in understanding cannabis risks during pregnancy is that cannabis use often occurs alongside other risk factors. Women who use cannabis during pregnancy are statistically more likely to also use tobacco, face food insecurity, experience high stress, or have limited access to prenatal care. Researchers struggle to separate which outcomes are caused by cannabis versus these other factors. This does not mean cannabis is safe—it means our current research cannot definitively answer the question of harm. Until better studies exist, uncertainty remains.

How Do CBD and THC Differ During Pregnancy?

Not all cannabis products are the same, and the distinction between CBD and THC matters when discussing pregnancy use. Many women seek out CBD specifically, believing it to be safer than THC, but the research on CBD during pregnancy is even more limited.

What We Know About CBD Exposure

CBD does not produce intoxication and has different mechanisms of action than THC. Some animal studies have suggested CBD may have protective effects against stress and inflammation. However, there is almost no human research on CBD use during pregnancy. We do not know what dose might be safe, what effects it might have on fetal development, or how it interacts with the endocannabinoid system during critical developmental windows. The FDA explicitly warns against CBD use during pregnancy due to this lack of safety data.

THC Considerations and Potency Concerns

THC is the cannabinoid that crosses the placenta most readily and produces psychoactive effects. Modern cannabis products can contain 15-30% THC or higher, compared to 3-5% in products from decades past, when much of the older research was conducted. This means exposure levels from today's products may be dramatically higher than what has been studied. If a mother chooses to use cannabis during pregnancy despite recommendations against it, lower-THC products and minimal use would theoretically pose less exposure risk than high-potency products, though even this is not proven safe.

Full-Spectrum vs Isolate Products

Some women seek full-spectrum hemp products containing CBD, minor cannabinoids, and trace THC (under 0.3%), believing the entourage effect may offer benefits. Others prefer CBD isolate to avoid any THC exposure. There is no research comparing these approaches during pregnancy. Understanding cannabinoid ratios and dosing becomes more complex when considering pregnancy, where no dose has been established as safe.

What About Cannabis Use During Breastfeeding?

THC is fat-soluble and passes into breast milk in measurable amounts. Research suggests that THC can be detected in breast milk for up to six days after use, though concentrations vary based on frequency of use and individual metabolism.

Research on Breastfeeding and Cannabis Exposure

Studies examining THC levels in breast milk have found that approximately 1-2% of the THC dose consumed by the mother may transfer to the infant through breastfeeding. For a mother consuming 25mg of THC, an exclusively breastfed infant might be exposed to 0.25-0.5mg. While this seems small, infants metabolize substances differently than adults, and we do not know what level of exposure might impact development. Some research has suggested potential impacts on infant motor development at one year, but again, confounding variables make causation difficult to establish.

Medical Recommendations and Risk-Benefit Considerations

The American Academy of Pediatrics recommends against cannabis use during breastfeeding. However, they also strongly advocate for breastfeeding due to its documented benefits for infant health and development. This creates another impossible bind for mothers: if cannabis is the only thing managing debilitating postpartum anxiety or pain, is it better to use cannabis and breastfeed, use cannabis and formula feed, stop cannabis and breastfeed while suffering, or take pharmaceutical alternatives that also pass into breast milk? There is no research-based answer to this question.

What the Jamaican Study Found About Breastfeeding

Dr. Dreher's research also examined breastfeeding in the Jamaican population. Women who used cannabis while breastfeeding did not show negative infant outcomes at one month or five years compared to non-using mothers. However, the same limitations apply—small sample size, confounding variables, and a specific cultural context. This research cannot tell us that cannabis use while breastfeeding is safe, but it does suggest the relationship may be more complex than a simple "exposure equals harm" model.

The Role of Honest Medical Communication

Perhaps the greatest harm in the current landscape around cannabis and pregnancy is the breakdown of honest communication between mothers and healthcare providers. Fear of judgment, legal consequences, or having children removed creates an environment where women hide their cannabis use from doctors, preventing informed medical care.

Why Mothers Don't Disclose Cannabis Use

Studies show that many pregnant women who use cannabis do not tell their healthcare providers. They fear being reported to child protective services, being denied pain relief during labor, or being judged as bad mothers. In states where cannabis is illegal, these fears have a basis in reality. Even in legal states, hospital policies may require reporting cannabis-positive tests to authorities. This dynamic means doctors cannot provide appropriate monitoring, cannot offer harm reduction strategies, and cannot have honest conversations about alternatives.

What Harm Reduction Would Look Like

If a mother has decided to use cannabis during pregnancy despite medical recommendations against it, harm reduction approaches could include: using the lowest effective dose, choosing lower-potency products, avoiding smoking in favor of edibles or vaporization to reduce combustion exposure, and timing use to later in pregnancy when major organ development is complete. However, these strategies cannot be discussed openly when the conversation itself carries potential legal and social consequences. Creating space for honest dialogue without judgment would better serve maternal and infant health than silence driven by fear.

Moving Toward Better Research and Support

The mothers making these decisions deserve better research, better treatment options for pregnancy symptoms, and better support from the medical system. Condemning cannabis use during pregnancy while offering limited alternatives for severe nausea, pain, or mental health symptoms does not serve mothers or babies. The conversation needs to shift from judgment to understanding, from prohibition to research, and from fear to informed decision-making. This is the space where education about natural wellness options and honest medical guidance should meet.

Your Next Step: Postpartum Support Without the Controversy

For mothers navigating the postpartum period—when pregnancy restrictions lift and the weight of new motherhood sets in—safe, legal, and researched cannabis options exist to support the transition. Society Plant was built by a mother who understands the depletion, the touch-out overwhelm, and the desperate need to feel like yourself again. For breastfeeding mothers seeking support without THC exposure, CBDA softgels offer anti-inflammatory and mood support with zero THC. For mothers who are not breastfeeding and want to ease back into balance, Good Day gummies with 1.5mg THC provide gentle support for the daytime overwhelm, while Good Night gummies help restore the deep sleep that makes everything else possible. You are not broken, you are depleted. And you deserve support that meets you where you are.