Why Is My Breast Milk Supply Decreasing? 10 Causes and Solutions

Posted on April 28, 2026

Why Is My Breast Milk Supply Decreasing? 10 Common Causes

Introduction
Understanding the Supply and Demand System
1. Not Removing Milk Often Enough
2. Supplementing with Formula
3. High Stress and Cortisol Levels
4. Dehydration and Nutrition
5. Certain Medications and Herbs
6. The Return of Your Menstrual Cycle
7. Illness and Fatigue
8. Poor Latch or Tongue-Tie
9. Pregnancy
10. Returning to Work
How to Increase Your Milk Supply
When to Seek Professional Help
Summary
FAQ

Introduction

It is late at night, and you are staring at a half-empty pump bottle or a fussy baby. You might feel a pit in your stomach, wondering where the milk went. We want you to take a deep breath. You are doing an amazing job. At Milky Mama, we hear from parents every day who are worried that their milk supply is suddenly dropping.

While breastfeeding is natural, it does not always come naturally. It is very common to experience fluctuations in your milk production. This post will cover the most common reasons your supply might dip, how to tell the difference between a real drop and a normal change, and actionable steps to get back on track. Understanding the "why" behind your supply changes is the first step toward finding a solution that works for you.

Understanding the Supply and Demand System

Before we look at the causes of a decrease, we must understand how your body makes milk. Your breasts operate on a supply and demand system. This means your body produces milk based on how much is removed.

When your baby nurses or you pump, your body receives a signal to make more. If milk stays in the breast, your body receives a signal to slow down production. This is regulated by a protein called Feedback Inhibitor of Lactation (FIL). When your breasts are full, FIL levels are high, telling your body to stop. When breasts are empty, FIL levels are low, telling your body to speed up.

True Low Supply vs. Perceived Low Supply

Many moms worry their supply is decreasing when their bodies are actually just becoming more efficient. This is often called "perceived low supply." Here are a few things that are actually normal:

Softer breasts: In the early weeks, your breasts may feel engorged or heavy. Around 6 to 12 weeks, your supply regulates. This means your body has figured out exactly how much milk your baby needs. Your breasts will feel softer, but you are still making plenty of milk.
Less milk when pumping: A pump is never as efficient as a baby. If you suddenly see less in the bottle but your baby is happy and gaining weight, your supply is likely fine.
Cluster feeding: If your baby wants to eat every hour, it usually means they are going through a growth spurt. This is their way of demanding more milk to increase your supply for their growing needs.
Shorter nursing sessions: As babies get older, they get better at removing milk quickly. A session that used to take 30 minutes might now take 10.

1. Not Removing Milk Often Enough

The most common reason for a true drop in supply is a decrease in demand. If you miss a nursing session or a pump session, your body thinks it does not need to make as much milk.

This often happens when a baby starts sleeping through the night. While we all love more sleep, a long stretch without milk removal can signal your body to slow down. It can also happen if you return to work and cannot pump as often as the baby would normally nurse.

Key Takeaway: To keep your supply steady, you must remove milk frequently. If your baby is not nursing, you should be pumping.

2. Supplementing with Formula

Introducing formula can lead to a "slippery slope" for milk supply. If you give your baby a bottle of formula instead of nursing, your breasts stay full. As we discussed with the supply and demand system, full breasts tell your body to stop producing.

If you must supplement for medical reasons, try to pump whenever the baby receives a bottle. This ensures your body still receives the signal to keep the "milk factory" running. Every drop counts, and even small amounts of breast milk provide incredible benefits.

3. High Stress and Cortisol Levels

Stress is a major factor in milk production. When you are stressed, your body produces cortisol. High levels of cortisol can interfere with your let-down reflex. The let-down reflex is the release of milk from the small sacs in your breasts into the ducts.

If your milk cannot "let down," it stays in the breast. Your baby may get frustrated, and your body will think the milk is not needed. We know telling a new mom to "relax" is easier said than done. However, finding small ways to lower your stress can have a physical impact on your supply.

4. Dehydration and Nutrition

Your body needs fuel to create milk. Breastfeeding burns about 450 to 500 extra calories per day. If you are not eating enough or are trying to lose "baby weight" too quickly, your supply may suffer.

Dehydration is another common culprit. You do not need to force-feed yourself water, but you should drink to thirst. A good rule of thumb is to have a glass of water every time you sit down to nurse or pump. Our Pumpin Punch™ lactation drink mix is a great way to stay hydrated while also getting lactation-support ingredients like fruit juices and electrolytes.

What to do next:

Keep a large water bottle with you at all times.
Eat small, frequent snacks rich in healthy fats and proteins.
Avoid restrictive diets in the first few months of breastfeeding.

5. Certain Medications and Herbs

Some common over-the-counter medications can dry up your milk supply. Antihistamines and decongestants (often found in cold and allergy medicine) are designed to dry up mucus. Unfortunately, they can dry up other body fluids too.

Certain types of hormonal birth control can also cause a dip. Specifically, birth control that contains estrogen is known to decrease milk production for many moms. If you need birth control, talk to your provider about "progestin-only" options, often called the "mini-pill."

6. The Return of Your Menstrual Cycle

For many moms, the return of their period causes a temporary drop in supply. This is due to a dip in blood calcium levels and changes in hormones like estrogen and progesterone.

You might notice your baby is more fussy or that you pump less milk in the few days before and during your period. This is usually temporary. Once your period starts or ends, your supply typically bounces back. Some lactation consultants recommend a calcium and magnesium supplement during this time to help bridge the gap.

7. Illness and Fatigue

If you get a cold or the flu, your supply might dip. This is usually not because of the virus itself, but because of the side effects. Fever, diarrhea, and vomiting can lead to dehydration.

Furthermore, when you are sick, you are exhausted. Fatigue can make it harder for your body to prioritize milk production. If you feel a bug coming on, prioritize rest and hydration. Our Milky Melon™ lactation drink mix is a refreshing option to help you stay hydrated when you are feeling under the weather.

8. Poor Latch or Tongue-Tie

If your baby cannot latch correctly, they cannot remove milk efficiently. If milk is not being removed, your supply will drop over time. You might notice sore nipples, or your baby may seem hungry even after a long feeding.

Tongue-tie or lip-tie can also prevent a baby from using their tongue to "milk" the breast. If you suspect a latch issue, reaching out to a certified lactation consultant is a great next step. They can help you adjust your positioning or identify if your baby needs a revision for a tie.

9. Pregnancy

If you are breastfeeding while pregnant, you will likely see a decrease in supply. This usually happens around the fourth or fifth month of pregnancy. Hormonal changes shift your body’s focus toward the developing fetus. Additionally, your milk will eventually transition back into colostrum (the thick, nutrient-rich first milk) to prepare for the new baby.

10. Returning to Work

Returning to work is a major transition. The stress of the change, combined with less frequent milk removal, often causes a supply dip. Many moms find they do not pump as much as their baby drinks while they are away.

To combat this, make sure your pump parts are in good condition. Silicone valves and membranes should be replaced every 1 to 3 months. If your pump is not working at its best, it will not remove milk effectively, leading to a decrease in supply over time.

How to Increase Your Milk Supply

If you have identified that your supply has indeed decreased, do not panic. For most moms, supply is not "gone" forever. It is something you can build back up with consistency and support.

Increase Nursing and Pumping Frequency

The most effective way to boost supply is to increase demand. Add an extra pump session or nurse your baby more often. You can also try "power pumping."

Power pumping mimics a baby's cluster feeding. To do this, find an hour once a day:

Pump for 20 minutes
Rest for 10 minutes
Pump for 10 minutes
Rest for 10 minutes
Pump for 10 minutes

Doing this for 3 to 5 days can signal your body that the baby needs more milk. For additional guidance, read this guide to boosting milk supply while exclusively breastfeeding.

Skin-to-Skin Contact

Spending time skin-to-skin with your baby releases oxytocin. This is the "love hormone" that triggers your let-down reflex. Try a "nurse-in" weekend. Stay in bed with your baby, keep them in just a diaper against your bare chest, and nurse on demand. This can help reset your hormones and your supply.

Use Lactation Support Products

Many parents find that certain ingredients, known as galactagogues (herbs or foods that support milk production), help them see an increase. At Milky Mama, our products are formulated by Krystal Duhaney, an RN and IBCLC, to ensure they are both safe and effective.

Our Emergency Brownies are a fan favorite. They are packed with oats, brewer's yeast, and flaxseed. These ingredients are rich in iron and B vitamins, which are essential for lactation. For those who prefer herbal support, our Pumping Queen™ supplement is a popular choice for those looking to support their supply without common fillers.

Action Step Checklist:

Check your pump parts for wear and tear.

Schedule a "nurse-in" or a few days of power pumping.

Increase your water intake and calorie count.

Reach out to a lactation consultant for a latch check.

When to Seek Professional Help

While many supply issues can be managed at home, sometimes you need professional eyes on the situation. You should contact a lactation consultant or your healthcare provider if:

Your baby is not gaining weight or is losing weight.
Your baby has fewer than six wet diapers in a 24-hour period.
Your baby’s urine is dark or concentrated.
You feel significant pain during breastfeeding.
You feel overwhelmed, anxious, or depressed.

Professional support can provide you with a personalized plan. Every body is different, and what works for one person might not work for another. A certified expert can help you navigate medical conditions like PCOS, thyroid issues, or previous breast surgeries that might affect supply.

Summary

A decrease in milk supply can feel like a major hurdle, but it is often a temporary challenge. By focusing on frequent milk removal, staying hydrated, and managing stress, many moms can successfully rebuild their supply. Remember that your worth as a parent is not measured in ounces. Whether you are breastfeeding, pumping, or supplementing, you are providing exactly what your baby needs: your love and care.

At Milky Mama, we are here to support you every step of the way. From our nourishing lactation treats like our cookies and brownies to our virtual consultations, we are dedicated to helping you reach your feeding goals. You’ve got this, and we’ve got you.

This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.

FAQ

How long does it take to increase milk supply?

Most moms begin to see an increase in their supply within 3 to 5 days of consistent effort. However, for some, it may take up to two weeks of increased nursing or pumping to see a significant change. Consistency is the most important factor when trying to build supply. For more information, explore this guide to increasing milk supply with exclusive pumping.

Can my period really make my milk supply drop?

Yes, hormonal shifts during your menstrual cycle can cause a temporary dip in supply for many people. This usually happens in the days leading up to your period and the first day or two of bleeding. Your supply will typically return to its normal level once the hormonal shift passes.

Will pumping after nursing help my supply?

Yes, pumping for 10 to 15 minutes after a nursing session can be very effective. It ensures that your breasts are thoroughly emptied, which signals your body to increase its rate of milk production. Even if you do not see much milk in the bottle, the extra stimulation is sending the right message to your brain. If you want additional instruction, consider the Breastfeeding 101 online course.

Does drinking more water always increase milk supply?

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Why Is My Breast Milk Supply Decreasing? 10 Causes and Solutions

Table of Contents

Introduction