You’ve just been told you might have PCOS. Maybe your doctor or lactation consultant brought it up, or you might suspect it yourself after hours of online searching. Take a deep breath — you are not alone.

If you’re trying to breastfeed, you may already be feeling some pressure. PCOS (Polycystic Ovary Syndrome) can add an extra layer of challenge, particularly because it’s often linked to insulin resistance — a metabolic issue that can directly affect your milk supply. But here’s the good news: many women with PCOS can breastfeed successfully, with the right information and support. Let’s walk through what this syndrome is, how it may impact breastfeeding, and most importantly, what you can do to support your body and your health, and your best milk supply.

What Is PCOS?

Polycystic Ovary Syndrome (PCOS) is one of the most common hormonal conditions affecting women, with up to 20% worldwide affected. Yet despite how common it is, PCOS is still poorly understood. We call it a syndrome, and not a disease, because it’s not a single or a uniform problem. Rather, PCOS shows up as a collection of possible symptoms that can be mild or severe, depending on multiple factors.  

It can be confusing that PCOS doesn’t have a specific “look.” It’s tied to weight gain, yet many women with PCOS are lean. In young women, its signs can be subtle —a stubborn belly bulge, or skin changes such as hirsutism (unwanted facial or body hair), acne (persistent breakouts, often on the face or back), or acanthosis nigricans (dark, velvety skin patches, often around the neck or armpits). As we age, the symptoms become stronger, trending toward metabolic disease, heart and kidney disease, and diabetes.

Here is the encouraging part: both research and clinical experience show that with dietary and lifestyle changes, and with supplements or medication when needed, many women can improve or even reverse PCOS symptoms. This means you have real tools to protect your health and support your breastfeeding journey.

PCOS can take an emotional toll. If you are feeling overwhelmed, anxious, or down, you’re not alone — up to 40% of women with PCOS experience anxiety or depression, often due to hormonal imbalances or the stress of managing symptoms. It’s okay to seek support, such as talking with a friend, connecting with other moms, or talking to a counselor. Your mental health is just as important as your physical health.

 

You might have PCOS if you have:

• Irregular or absent periods (cycles longer than 35 days or fewer than 8 periods a year, and often starting irregularly in your teens). 

• Higher testosterone, causing extra hair growth or acne. 

• Lower progesterone, lays the groundwork for Premenstrual Syndrome. 

• Insulin resistance, when your body struggles to use insulin. 

• Multiple small ovarian cysts, seen on an ultrasound, though many women with PCOS have none.

 

The Root-Causes of PCOS

About 70 percent of women with PCOS inherit a genetic tendency toward hormonal imbalances. The remaining cases may be shaped by hormonal or environmental factors during fetal development.

Modern life can intensify these risks. High-sugar diets, chronic stress, and exposure to chemicals like glyphosate (a herbicide), BPA (in plastics), phthalates (in cosmetics), microplastics, and PFAS (so-called “forever chemicals”) can worsen insulin resistance and disrupt hormones, making PCOS symptoms more pronounced. These same chemical exposures can also affect developing fetuses in the womb.

Researchers now understand PCOS to arise from a combination of genetics, environmental influences, and transgenerational effects — often described as epigenetics, or how the environment shapes gene expression. Emerging studies show that exposures during pregnancy, especially chronic stress, ultra-processed foods, or chemical contaminants, can leave a lasting biological imprint that raises the likelihood of PCOS. Importantly, male fetuses are not exempt. These same influences can increase the risk of metabolic syndrome, possibly explaining why so many children today show lipid and cholesterol patterns that, a few generations ago, were typical only in late middle age.

While we cannot change the past, understanding these roots gives us the power to make informed choices today, improving our health and supporting our breastfeeding journey.

 

Different Faces of PCOS

While many people associate PCOS with irregular periods, excess androgens (male-type hormones), and ovarian cysts, research shows there are multiple PCOS subtypes, each with its own pattern of hormonal and metabolic features.

Some women have what’s called classic PCOS, with clear signs of high testosterone, long or absent cycles, and polycystic ovaries seen on ultrasound. Others have milder or hidden forms, where menstrual cycles are irregular but ovulation still happens, or where insulin resistance is present but without signs of elevated androgens.

These milder PCOS-like patterns often go unrecognized in the medical system. Many doctors are trained to look for the most obvious signs and symptoms, and they may overlook women who carry subtle hormonal imbalances but still experience real effects — such as delayed puberty, mild insulin resistance, incomplete breast development, or low milk supply postpartum.

The Four Main Subtypes of PCOS

PCOS Subtype	Key Features	Possible Focus Areas
Classic PCOS (Phenotype A)	High testosterone, irregular or absent periods, polycystic ovaries on ultrasound	Lowering androgens, regulating ovulation, metabolic support
Non-Polycystic Type (B)	High testosterone, irregular periods, normal ovaries on ultrasound	Lowering androgens, cycle regulation, metabolic support
Ovulatory PCOS (C)	High testosterone, regular ovulation and periods, polycystic ovaries	Managing androgens, supporting insulin balance
Milder or “Hidden” PCOS (D)	Irregular periods or ovulation, polycystic ovaries, no obvious signs of high androgens	Supporting ovulation, improving metabolic function, gentle hormonal balancing

Because of this variation, protocols and strategies need to be tailored to each woman’s individual pattern. What helps one mother — such as reducing testosterone or stimulating ovulation — might not be the right focus for another, who primarily needs metabolic or adrenal support*, or help addressing insulin sensitivity.

This is why working with a knowledgeable lactation consultant or clinician familiar with the range of PCOS patterns can make a meaningful difference. Even small, steady steps — supporting metabolic health, balancing blood sugar, reducing inflammation, and managing stress — can help shift the mother’s overall health and improve breastfeeding outcomes over time.

*Metabolic support involves addressing insulin resistance through lifestyle changes (diet, exercise) or medications like metformin.

 

The Core Drivers of PCOS: Insulin and Inflammation

To truly understand how PCOS affects breastfeeding, we need to explore two key underlying drivers: insulin resistance and chronic inflammation.

Insulin resistance means your cells don’t respond properly to insulin, the hormone that moves sugar from your blood into your cells. This resistance forces your pancreas gland to work overtime, pumping out extra insulin to keep blood sugar under control. This rise in insulin is called hyperinsulinemia —meaning the insulin levels in your blood are chronically higher than normal. High insulin levels require special testing to diagnose, called HOMA/IR, available with a reference by your doctor.

Chronic Inflammation is like a low-grade immune response in your body. It is often triggered by ingredients in ultra-processed foods, stress, or chemicals like glyphosate, BPA, or phthalates. It shows up as belly fat, and amplifies insulin resistance, estrogen dominance, and hormonal imbalances, creating a cycle that fuels PCOS.

Chronic insulin resistance in your cells and high insulin levels in your blood affect many systems in your body that impact milk production:

Ovary function
 High insulin stimulates your ovaries to produce more testosterone, disrupting ovulation, menstrual cycles, and breast tissue development.

Fatty liver
 Excess insulin encourages fat to accumulate in the liver (now called metabolic fatty liver), which disrupts liver function. Since the liver helps regulate blood sugar, cholesterol, and hormone metabolism, liver stress further aggravates hormonal imbalances and inflammation.

Fat storage and inflammation
 High insulin promotes fat storage, especially around the belly and internal organs. This type of fat isn’t just “stored energy” — it’s metabolically active, releasing inflammatory chemicals that worsen insulin resistance and disrupt hormonal signals.

Breastfeeding hormones
 Insulin resistance can reduce your breast tissue’s sensitivity to prolactin (the milk-making hormone) and oxytocin (the milk letdown hormone), making it harder for your body to fully respond to these signals, even when you’re nursing frequently.

Thyroid health
 High insulin levels and chronic inflammation can also make your thyroid gland more vulnerable to dysfunction. Over time, this can contribute to hypothyroidism (underactive thyroid), hyperthyroidism (overactive thyroid), or increase the risk of postpartum thyroiditis (sometimes called postpartum Hashimoto’s), an autoimmune flare that can arise after pregnancy. Since the thyroid plays a central role in metabolism, mood, and lactation, protecting thyroid health is an important part of supporting both hormonal balance and milk supply.

The good news:

Insulin resistance and inflammation are highly responsive to support.
 Small, steady steps — like balancing meals with whole foods, protein and healthy fats, adding gentle movement, reducing sugar intake, choosing low-chemical products and managing stress — can gradually improve insulin sensitivity over time, as well as the other symptoms of PCOS. Supporting your body’s insulin balance not only helps with energy and metabolism but can directly improve your hormonal landscape for breastfeeding.

 

Breastfeeding with PCOS: Challenges and Hope

Hormonal imbalances — such as low progesterone, high cortisol, and high testosterone — can affect how breast tissue develops during puberty and pregnancy. This sometimes reduces the amount of glandular (milk-making) tissue, lowering the body’s potential milk supply.

While statistics vary, it’s generally estimated that about 30–40% of mothers with PCOS experience some degree of breastfeeding difficulty. For roughly 15%, this may be linked to insufficient glandular tissue (IGT). Only about 5% of women with PCOS are thought to have a severe lack of tissue, and even fewer have so little that producing any milk becomes impossible.

The good news is that after birth, nursing and pumping stimulate the existing glandular tissue, encouraging further development and increasing potential milk production over time. Even if achieving a full supply isn’t possible, combination feeding (nursing plus supplementation) remains a meaningful option, offering bonding, immune benefits, and emotional connection. A lactation consultant can work with you to help build your supply as much as possible and guide you toward feeding solutions tailored to your unique situation.

The Lactogenic Diet and PCOS

The Lactogenic Diet, developed by holistic lactation consultant Hilary Jacobson, is based on foods, herbs, spices and condiments that balance blood sugar, increase insulin sensitivity, and reduce inflammation. The old saying, “Let food be your medicine,” applies here and can be very effective in supporting mothers with PCOS and low milk supply.

Many herbal galactagogues — like goat’s rue, moringa, nettle, and alfalfa — don’t just support milk production; they also help balance blood sugar. Similarly, carbs like oats and sweet potatoes offer steady, nourishing energy for both metabolism and lactation.

A lactogenic diet:

• Prioritizes whole, minimally processed foods
• Eating balanced meals with protein, healthy fats, and fiber
• Avoiding refined sugars and excessive starches
• Supporting hydration, rest, and gentle exercise

These aren’t quick fixes, but they are powerful, sustainable ways to help your body work with you, not against you.

Your Overview

Common Challenges for Mothers with PCOS

✅ Low Milk Supply

• Affects ~30–40% of mothers with PCOS
• Causes: underdeveloped glandular (milk-making) tissue or breast tissue that doesn’t easily or fully respond to prolactin and oxytocin
• Clues: minimal breast changes during pregnancy, baby not gaining weight despite frequent nursing, needing to supplement

✅ Delayed Lactogenesis (Milk Coming In Late)

• Affects ~20–25% of mothers with PCOS
• Causes: hormonal disruptions from elevated insulin and androgens, or thyroid imbalances
• Clues: colostrum phase lasts longer than expected (beyond 3–4 days), mature milk production feels slow to start

✅ Need for Supplementation

• Some mothers, especially those with severe breast hypoplasia (underdeveloped tissue), may need to combine nursing or pumping with formula or donor milk.
• Important: Needing supplementation does not mean you’ve failed. Breastfeeding is not all or nothing — combination feeding still offers bonding, immune, and hormonal benefits.

 

What You Can Do

⭐ Start Early and Often
 Frequent breastfeeding or pumping in the first days postpartum helps stimulate prolactin and build your milk-making capacity.

⭐ Work with the Right Lactation Consultant
 Not all lactation consultants specialize in low milk supply, so look for one with extended training in this area. If you can, find someone familiar with holistic or functional medicine — they can help guide you in choosing the right lab tests, medications, or supplements tailored to your situation. Having the right team around you makes a huge difference.

 

A PCOS Support Plan, Pre-Conception, Pregnancy, to Postpartum

The following suggestions reflect general practices and supplements widely used by women with insulin resistance, PCOS, and low milk supply to support their metabolic health across the reproductive phases. However, individual needs vary, and exact dosages can differ depending on personal health, medication use, and life stage. Before starting any new supplement, herb, or protocol — especially regarding dosage — please review these options with your healthcare provider to ensure they are appropriate and safe for your situation, and to avoid potential interactions or contraindications with medications.

 

🔹 Pre-Conception
 Goals: normalize cycles, reduce androgen excess, improve insulin sensitivity, support egg quality

• Myo-inositol + D-chiro-inositol, magnesium, zinc, selenium, chromium
• Spearmint tea or extract, vitex (if appropriate), royal jelly
• Probiotic-rich foods, prebiotic fibers, mucilaginous herbs (marshmallow root, flaxseed tea)
• Bitter tonics, anti-inflammatory whole-food diet

🔹 Pregnancy Phase
 Goals: hormonal balance, prevent gestational diabetes, encourage fetal metabolic imprinting

• Continue: myo-inositol, magnesium, zinc, selenium
• Add: choline, omega-3s, bone broth, collagen
• Gut support: fermented foods, soluble fiber, liver-supporting foods
• Stress management: gentle movement, calming herbs

🔹 Postpartum Phase
 Goals: restore metabolic balance, support milk production, protect against PCOS relapse

• Recovery nutrients: magnesium, zinc, selenium, B-complex, choline, DHA
• Adaptogens (if appropriate), gut healing foods, lactogenic herbs
• Emotional care: chamomile tea, gentle affirmations, sleep hygiene

 

You Are Not Broken

If you are struggling with low milk supply or delayed lactation, please hear this:

You are not failing, and you are not broken.

PCOS can add complexity to your breastfeeding journey, but it does not close the door. With the right knowledge, tools, and support — nutritional, hormonal, and emotional — your body can often do far more than you’ve been led to believe.

Breastfeeding is not a test of self-worth or commitment. Whether you nurse exclusively, supplement, pump, or follow a combination of strategies, what matters most is that you and your baby are nourished, supported, and cared for.

Sources

Prevalence and diagnostic criteria:

Fauser, B. C., Tarlatzis, B. C., Rebar, R. W., Legro, R. S., Balen, A. H., Lobo, R., … & Barnhart, K. (2012). Consensus on women’s health aspects of polycystic ovary syndrome (PCOS): the Amsterdam ESHRE/ASRM-Sponsored 3rd PCOS Consensus Workshop Group. Fertility and sterility, 97(1), 28-38.

PCOS and breastfeeding:

Vanky, E., et al. (2012). “Breastfeeding in polycystic ovary syndrome.” Acta Obstetricia et Gynecologica Scandinavica, 91(11), 1221–1226. [DOI: 10.1111/j.1600-0412.2012.01483.x]

 

Insulin resistance and PCOS:

Dunaif, A. (1997). Insulin resistance and the polycystic ovary syndrome: mechanism and implications for pathogenesis. Endocrine reviews, 18(6), 774-800.

Lean PCOS:

Lizneva, D., Kirubakaran, R., Mykhalchenko, K., Suturina, L., Chernukha, G., Diamond, M. P., & Azziz, R. (2016). Phenotypes and body mass in women with polycystic ovary syndrome identified in referral versus unselected populations: systematic review and meta-analysis. Fertility and sterility, 106(6), 1510-1520.

PCOS Prevalence, Phenotypes and Symptoms:

Fauser, B. C., Tarlatzis, B. C., Rebar, R. W., Legro, R. S., Balen, A. H., Lobo, R., … & Barnhart, K. (2012). Consensus on women’s health aspects of polycystic ovary syndrome (PCOS): the Amsterdam ESHRE/ASRM-Sponsored 3rd PCOS Consensus Workshop Group. Fertility and sterility, 97(1), 28-38.

Genetics and Environment:

Dumesic, D. A., Oberfield, S. E., Stener-Victorin, E., Marshall, J. C., Laven, J. S., & Legro, R. S. (2015). Scientific statement on the diagnostic criteria, epidemiology, pathophysiology, and molecular genetics of polycystic ovary syndrome. Endocrine reviews, 36(5), 487-525.

Environmental Chemicals (Glyphosate, BPA, Phthalates):

Palioura, E., & Diamanti-Kandarakis, E. (2015). Polycystic ovary syndrome (PCOS) and endocrine disrupting chemicals (EDCs). Reviews in Endocrine and Metabolic Disorders, 16(4), 365-371.

Green, M. P., Harvey, A. J., Finger, B. J., & Tarulli, G. A. (2021). Endocrine disrupting chemicals: Impacts on human fertility and fecundity during the peri-conception period. Environmental research, 194, 110694.

Diamanti-Kandarakis, E., Papalou, O., & Kandaraki, E. (2022). Endocrine-disrupting chemicals and PCOS: A novel contributor in the etiology of the syndrome. In Polycystic Ovary Syndrome (pp. 227-244). Elsevier.

Mental Health

Zehravi, M., Maqbool, M., & Ara, I. (2021). Depression and anxiety in women with polycystic ovarian syndrome: a literature survey. International Journal of Adolescent Medicine and Health, 33(6), 367-373.

Insulin Resistance and Inflammation:

Moghetti, P., & Tosi, F. (2021). Insulin resistance and PCOS: chicken or egg?. Journal of endocrinological investigation, 44(2), 233-244.

Diamanti-Kandarakis, E., & Dunaif, A. (2012). Insulin resistance and the polycystic ovary syndrome revisited: an update on mechanisms and implications. Endocrine reviews, 33(6), 981-1030.

Abraham Gnanadass, S., Divakar Prabhu, Y., & Valsala Gopalakrishnan, A. (2021). Association of metabolic and inflammatory markers with polycystic ovarian syndrome (PCOS): an update. Archives of gynecology and obstetrics, 303, 631-643.

 

Epigenetics and Transgenerational Effects:

Dumesic, D. A., Hoyos, L. R., Chazenbalk, G. D., Naik, R., Padmanabhan, V., & Abbott, D. H. (2020). Mechanisms of intergenerational transmission of polycystic ovary syndrome. Reproduction, 159(1), R1-R13.

Salinas, I., Sinha, N., & Sen, A. (2021). Androgen-induced epigenetic modulations in the ovary. Journal of Endocrinology, 249(3), R53-R64.Dumesic, D., Chazenbalk, G., & Heber, D. (2024). Precision nutrition in female reproductive health. In Precision Nutrition (pp. 227-240). Academic Press.

Fatty Liver in PCOS:

Macut, D., et al. (2016). “Nonalcoholic fatty liver disease in PCOS.” Hormones, 15(3), 408–415. [DOI: 10.14310/horm.2002.1645]

Singla, R., et al. (2015). “Thyroid disorders and PCOS.” Indian Journal of Endocrinology and Metabolism, 19(1), 66–71. [DOI: 10.4103/2230-8210.146860]