Understanding What Causes Low Milk Supply in Breastfeeding

Posted on March 23, 2026

Introduction
Perceived vs. Real Low Milk Supply: The Great Mind Game
The Biological "Why": Common Causes of Low Milk Supply
Lifestyle Factors and Their Impact
Medications and Substances to Watch
How to Know if Your Baby is Getting Enough
Practical Steps to Boost Your Supply
The Power of Community and Professional Support
Identifying and Overcoming Nursing Strikes
Mental Health and the "Every Drop Counts" Philosophy
Summary Checklist for Boosting Supply
Medical & FTC Disclaimer
FAQ
Conclusion

Introduction

It is 3:00 AM. You are sitting in a dimly lit nursery, the rhythmic sound of your baby’s breathing filling the room, and suddenly a wave of worry washes over you. Your breasts feel softer than they did last week. Your baby seems to be nursing more frequently, almost as if they cannot get enough. You glance at the breast pump and wonder if the ounces you’re seeing are "enough." If you have ever looked down at your baby and wondered, “Am I making enough milk?” please know that you are not alone. In fact, the fear of an inadequate milk supply is one of the most common reasons why parents stop breastfeeding earlier than they intended.

At Milky Mama, founded by Krystal Duhaney, RN, BSN, IBCLC, we believe that breastfeeding is natural, but it doesn’t always come naturally. We understand the emotional weight that comes with every drop of milk. Whether you are a first-time parent or an experienced pro, the complexity of the human body can sometimes feel like a mystery. The good news is that for the vast majority of families, your breasts were literally created to feed human babies, and most supply issues can be managed, improved, or even reversed with the right knowledge and support.

The purpose of this guide is to dive deep into what causes low milk supply in breastfeeding, separating common myths from clinical realities. We will explore the biological, lifestyle, and management factors that can impact your production, and most importantly, we will provide you with the tools and resources to help you feel empowered on your journey. Whether you are navigating a medical condition like PCOS or simply trying to balance a busy schedule, we are here to remind you that every drop counts and your well-being matters just as much as your baby’s.

Perceived vs. Real Low Milk Supply: The Great Mind Game

Before we look into the physical causes, we have to talk about the "perception" of low supply. Many parents believe their supply is dropping when, in reality, their bodies are simply becoming more efficient. It is vital to distinguish between a baby who is going through a normal developmental phase and a true clinical low supply.

Why Your Breasts Feel "Empty"

Around the six-to-twelve-week mark, many parents notice their breasts no longer feel engorged or "full" between feedings. This is often misinterpreted as a sign that the milk is "gone." In reality, your body has simply transitioned from being driven by hormones to being driven by supply and demand. Your breasts are now like a factory rather than a warehouse; they make milk as the baby drinks. Soft breasts are actually a sign of a well-regulated supply!

The Mystery of Cluster Feeding

Does your baby want to nurse every forty-five minutes for three hours straight every evening? This is called cluster feeding, and it is a completely normal behavior. It doesn’t mean your breasts are empty; it means your baby is "ordering" more milk for tomorrow. This behavior is common during growth spurts (typically at three weeks, six weeks, three months, and six months).

The Pump Output Trap

Many parents feel discouraged when they only pump an ounce or two after a nursing session. However, a pump is never as efficient as a baby. Your output in a plastic bottle is not a definitive measurement of what your baby is getting at the breast. If you are struggling with pump output, you might find support in supplements like Pumping Queen™, which is designed specifically to support those using a breast pump.

The Biological "Why": Common Causes of Low Milk Supply

If your supply is truly low—meaning your baby is not gaining weight appropriately or is not producing enough wet and dirty diapers—there is usually a root cause. Understanding what causes low milk supply in breastfeeding requires looking at both how you manage feedings and how your body is functioning internally.

1. Inefficient Milk Removal

Breast milk production is a "use it or lose it" system. When milk is left in the breast, a protein called Feedback Inhibitor of Lactation (FIL) sends a signal to your brain to slow down production.

Poor Latch: If the baby isn't latched deeply, they cannot effectively compress the milk ducts. This leaves milk behind, which tells your body to make less.
Scheduled Feedings: Trying to stick to a strict "every three hours" schedule can be detrimental. We always recommend feeding on demand. When you limit the time at the breast, you limit the demand, which eventually lowers the supply.
Nipple Shields: While they are helpful tools for some, if not fitted correctly, they can sometimes prevent the breast from being fully emptied.

2. Supplementing with Formula

While there is no shame in using formula, it is important to understand the biological impact on your supply. If you give a bottle of formula instead of nursing or pumping, your body misses that signal to create milk. Over time, this "top-off syndrome" can lead to a significant decrease in your natural production. If you must supplement, we recommend pumping during that time to keep your "demand" high.

3. Maternal Health and Hormonal Imbalances

Sometimes, the issue isn't what you are doing, but what is happening inside your body. Hormones are the "conductors" of the breastfeeding orchestra.

Retained Placenta: Even a tiny piece of the placenta remaining in the uterus can keep progesterone levels high enough to prevent your milk from fully "coming in."
PCOS (Polycystic Ovary Syndrome): This can affect the development of mammary tissue or cause hormonal imbalances that make it harder to establish a full supply.
Thyroid Issues: Both hypothyroidism and hyperthyroidism can interfere with the hormones responsible for milk production.
Insufficient Glandular Tissue (IGT): Some parents are born with less "milk-making" tissue. While this is rare, it is a physical reality for some. Even in these cases, many parents can still provide some breast milk, and we believe every drop counts.

4. Previous Breast Surgeries

Surgeries such as breast reductions or augmentations can sometimes damage the nerves or milk ducts. The impact depends on the type of incision used and how much tissue was removed. If you have had surgery, working closely with an expert through virtual lactation consultations can help you create a customized plan.

Lifestyle Factors and Their Impact

The life of a new parent is often a whirlwind of sleep deprivation and stress. Unfortunately, these environmental factors play a major role in what causes low milk supply in breastfeeding.

The Cortisol Connection

Stress is perhaps the most significant "milk killer." When you are stressed, your body produces cortisol, which can inhibit the let-down reflex. This means that even if the milk is there, it has a hard time "letting go" for the baby or the pump. We know it’s easier said than done, but finding small ways to relax—like enjoying one of our Emergency Brownies—can provide a much-needed moment of self-care and nutritional support.

Sleep Deprivation and Fatigue

While "sleep when the baby sleeps" is often unrealistic advice, extreme fatigue can take a toll on your metabolic processes. Your body needs energy to create milk. If you are running on empty, your milk supply might follow suit.

Dehydration and Nutrition

You cannot pour from an empty cup—literally. Breast milk is roughly 87% water. If you aren't staying hydrated, your supply may suffer. Many parents find it helpful to keep a "hydration station" at their nursing spot. Including lactation-supportive drinks like Pumpin Punch™ or Milky Melon™ can help you stay hydrated while providing the nutrients your body needs to thrive.

Medications and Substances to Watch

Certain medications and lifestyle habits can sneakily decrease your supply. If you notice a sudden drop, look at your medicine cabinet.

Decongestants and Antihistamines: Medications containing pseudoephedrine (often found in cold and allergy meds) are designed to dry up mucus, but they can also dry up your milk supply.
Hormonal Birth Control: Contraceptives containing estrogen are notorious for causing a dip in supply. Most IBCLCs recommend progestin-only options (like the "mini-pill" or certain IUDs) if you need hormonal birth control while breastfeeding.
Smoking and Alcohol: Nicotine can lower prolactin levels, and while the "beer for breastfeeding" myth exists, alcohol can actually dehydrate you and inhibit the let-down reflex.
Certain Herbs: While many herbs are helpful, some, like sage, peppermint, and parsley in very large culinary amounts, can be used to dry up milk.

How to Know if Your Baby is Getting Enough

Since we can't see exactly how many milliliters are being consumed during a nursing session, we have to look for secondary signs of success.

"The best way to know if your baby is eating well is to look at the baby, not the clock or the pump."

The Diaper Count

After the first week of life, you should see:

6 to 8 heavy wet diapers in a 24-hour period.
At least 1 to 3 yellow, seedy stools per day (though some older breastfed babies may go several days between stools, this is more common after 6 weeks).

Weight Gain and Alertness

Your pediatrician will track your baby's growth curve. Most babies should return to their birth weight by two weeks of age. Additionally, an infant who is getting enough milk will generally be "milk drunk" (relaxed and sleepy) after a feed and alert/active when awake. If your baby is constantly fussy, lethargic, or not meeting weight goals, it is time to consult a professional.

Practical Steps to Boost Your Supply

If you have identified that your supply is lower than you’d like, don’t panic. There are many evidence-based ways to encourage your body to produce more.

1. Increase the "Demand"

The more often you empty your breasts, the faster they will refill.

Power Pumping: This mimics a baby's cluster feeding. You pump for 20 minutes, rest for 10, pump for 10, rest for 10, and pump for 10. Doing this once a day for a few days can signal a major "order" to your brain.
Skin-to-Skin Contact: Spending time chest-to-chest with your baby (both of you undressed from the waist up) triggers the release of oxytocin, the hormone responsible for milk let-down.
Breast Compressions: While the baby is nursing, gently squeeze your breast to help move the milk forward and keep the baby interested in swallowing.

2. Focus on Nourishment

Eating a balanced diet rich in "galactagogues" (foods that may increase milk supply) can be a delicious way to support your journey. Oats, flaxseed, and brewer's yeast are classic favorites. If you are short on time, our Oatmeal Chocolate Chip Cookies or Salted Caramel Cookies are a perfect grab-and-go snack designed with nursing parents in mind.

3. Targeted Herbal Support

For many parents, herbal supplements provide the extra boost they need. It is important to choose supplements that are high-quality and formulated by experts.

Lady Leche™: A great all-around support for milk production.
Dairy Duchess™: Formulated to support those who want to enrich the quality of their milk.
Pump Hero™: Specifically designed to support mammary tissue and milk flow.

Disclaimer: These products are not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.

The Power of Community and Professional Support

Breastfeeding was never meant to be done in isolation. Historically, parents had a "village" to guide them. In the modern world, we have to build that village ourselves.

If you are struggling to find the root of what causes low milk supply in breastfeeding, we highly recommend seeking out a Board Certified Lactation Consultant (IBCLC). They can perform a "weighted feed" (weighing the baby before and after nursing) to see exactly how much milk is being transferred.

We also invite you to join The Official Milky Mama Lactation Support Group on Facebook. It is a safe, judgment-free space where you can connect with thousands of other parents who are navigating the same ups and downs. Representation matters, and seeing other parents of all backgrounds succeed can be the empowerment you need to keep going.

Identifying and Overcoming Nursing Strikes

Sometimes, what looks like low milk supply is actually a "nursing strike." This happens when a baby suddenly refuses the breast. It can be caused by ear infections, teething, a change in your soap or deodorant, or even a reaction to a "scare" at the breast (like if you shouted when they accidentally bit you). During a strike, it is vital to pump to maintain your supply while you patiently work on coaxing the baby back to the breast with lots of skin-to-skin time and low-pressure offering.

Mental Health and the "Every Drop Counts" Philosophy

We cannot talk about milk supply without talking about maternal mental health. The pressure to provide "exclusive" breast milk can sometimes lead to intense anxiety. We want to remind you that your value as a parent is not measured in ounces. Whether you are providing one teaspoon of milk a day or sixty ounces, you are doing an amazing job.

If the stress of trying to increase your supply is impacting your ability to bond with your baby or is causing symptoms of postpartum depression or anxiety, please talk to your healthcare provider. Your well-being matters. A happy, healthy parent is the most important thing your baby needs.

Summary Checklist for Boosting Supply

If you're feeling overwhelmed, start with these simple steps:

Check the Latch: Ensure it’s deep and comfortable.
Hydrate: Drink water or a Lactation LeMOOnade™.
Empty the Breast: Nurse or pump at least 8-12 times in 24 hours.
Snack Smart: Keep Peanut Butter Chocolate Chip Cookies in your diaper bag.
Seek Help: Book a consultation if you don't see improvement in 48-72 hours.

Medical & FTC Disclaimer

This blog post is for educational and informational purposes only and does not constitute medical advice. The information provided is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician, IBCLC, or other qualified health provider with any questions you may have regarding a medical condition. These products and statements have not been evaluated by the Food and Drug Administration. Milky Mama products are not intended to diagnose, treat, cure, or prevent any disease.

FAQ

1. Can I increase my milk supply after it has already dropped? Yes! In many cases, milk supply can be increased through a process called "relactation" or simply by increasing demand. By nursing more frequently, using power pumping techniques, and ensuring you are well-nourished and hydrated, you can often signal your body to ramp production back up. It takes patience—usually 3 to 7 days of consistent effort before you see a significant change.

2. Does drinking more water automatically mean more milk? While dehydration can definitely decrease your milk supply, drinking excessive amounts of water beyond your thirst level doesn't necessarily "force" more milk. However, staying optimally hydrated is essential for your body to function correctly. Many parents find that flavored options like our Drink Sampler make it much easier to hit their daily hydration goals.

3. Will my milk supply decrease when I go back to work? It doesn't have to! The key to maintaining supply after returning to work is a consistent pumping schedule. You should aim to pump as often as your baby would normally eat (usually every 3 hours). Using high-quality herbal support like Milk Goddess™ can also help maintain those levels during the transition.

4. Is it normal for one breast to produce more than the other? Absolutely! It is very common to have a "slacker boob" and a "super-producer." This is usually due to differences in the amount of glandular tissue or the number of milk ducts in each breast. As long as your total output is meeting your baby's needs, asymmetrical production is nothing to worry about.

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Understanding What Causes Low Milk Supply in Breastfeeding

Table of Contents

Introduction