When Does Your Milk Supply Drop When Pregnant: What to Expect

Posted on April 09, 2026

When Does Your Milk Supply Drop During Pregnancy?

Introduction
The Role of Hormones in Pregnancy and Lactation
The Typical Timeline: When to Expect a Decrease
Signs Your Milk Supply Is Dropping
Understanding the Change to Colostrum
Nutrition and Hydration: Can They Stop the Drop?
Managing Nipple Sensitivity and Nursing Aversion
Is My Older Baby Getting Enough?
Should You Use Lactation Supplements While Pregnant?
The Decision to Wean or Tandem Nurse
Summary and Next Steps
FAQ

Introduction

Discovering you are pregnant while still breastfeeding often brings up a mix of excitement and questions. Many parents wonder how a new pregnancy will affect their current nursing relationship and, specifically, when their milk supply might start to change. At Milky Mama, we know that navigating "nursing through pregnancy" requires extra support and clear information to help you make the best decisions for your growing family.

This post will explore the hormonal shifts that impact lactation, the typical timeline for a supply decrease, and how to manage the physical changes that come with tandem nursing—or nursing two children of different ages. While every body responds differently to pregnancy hormones, most people notice a significant dip in production by the second trimester. Our goal is to help you understand what is happening in your body so you can feel empowered throughout this transition.

Whether you plan to continue breastfeeding through your entire pregnancy or are considering weaning, understanding the "why" behind supply changes is essential. Breastfeeding is a beautiful journey, but it does not always follow a straight line. By the end of this article, you will have a better grasp of the physiological shifts occurring and how to support your wellness along the way.

The Role of Hormones in Pregnancy and Lactation

To understand when your milk supply might drop, it helps to look at the powerful hormones at work. Breastfeeding is primarily driven by a hormone called prolactin. Prolactin is often referred to as the "milk-making hormone" because it signals the mammary glands to produce milk. When you are not pregnant, your body maintains a delicate balance to keep this production steady based on your baby's demand.

However, once a new pregnancy begins, your body prioritizes the developing fetus. To do this, it increases the production of estrogen and progesterone. Progesterone is known as the "pregnancy-maintaining hormone." While it is vital for a healthy pregnancy, it has a direct inhibitory effect on prolactin. High levels of progesterone essentially "quiet" the milk-making signals in your breasts.

This hormonal shift is the primary reason for a supply drop. It is a biological safeguard designed to ensure the new pregnancy has the resources it needs. Even if you continue to nurse or pump frequently, these internal hormonal signals often override the "supply and demand" rule that usually governs lactation.

The Typical Timeline: When to Expect a Decrease

While every pregnancy is unique, there is a general timeline that many breastfeeding parents experience. The drop in supply is rarely an overnight disappearance; rather, it is usually a gradual decline that follows the rise of pregnancy hormones.

The First Trimester (0–13 Weeks)

During the first few weeks of pregnancy, you may not notice any change in your milk volume at all. However, as you approach the end of the first trimester, many parents report a slight decrease. You might notice that your breasts feel less full or that your baby seems a bit more restless during feedings.

Another common early sign is nipple sensitivity. For many, this is one of the first indicators of pregnancy. This sensitivity can make nursing feel uncomfortable, which may lead to shorter sessions and a subsequent slight drop in supply.

The Second Trimester (14–26 Weeks)

The most significant drop in milk supply typically occurs between the fourth and fifth months of pregnancy (around 16 to 20 weeks). During this window, progesterone levels are climbing steadily. Research and anecdotal evidence suggest that up to 70% of breastfeeding parents will experience a noticeable decrease in milk volume during the second trimester.

At this stage, your milk also begins to transition back into colostrum. Colostrum is the thick, concentrated "first milk" that is high in antibodies and protein but very low in volume. This transition is a preparation for the new baby, but it can be a major turning point for the nursing toddler or older baby who is used to a higher volume of mature milk.

The Third Trimester (27 Weeks–Birth)

By the third trimester, milk supply usually remains low or stays in the colostrum phase. Some toddlers continue to nurse through this stage for comfort, even if they are receiving very little milk. This is often referred to as "dry nursing," where the child continues the nursing behavior despite the low volume.

Signs Your Milk Supply Is Dropping

If you are pregnant and breastfeeding, you might not be measuring your output in a bottle, making it harder to tell if a drop is occurring. However, your nursing child will likely give you plenty of clues.

Changes in Nursing Behavior: Your child may pull back from the breast frequently, look frustrated, or try to switch sides more often than usual.
Longer Nursing Sessions: Some children will nurse longer in an attempt to "trigger" a let-down (the reflex that releases milk from the ducts) that is taking longer to occur.
Increased Interest in Solid Foods or Other Liquids: If your child is older than six months, you may notice they are suddenly much more interested in their water cup or snacks.
Nipple Soreness: As supply drops and the milk becomes more concentrated, the way the child latches can change, which may lead to increased sensitivity for you.

Key Takeaway: A drop in supply during pregnancy is a physiological response to rising progesterone levels and is usually most noticeable between the fourth and fifth months.

Understanding the Change to Colostrum

One of the most fascinating aspects of nursing during pregnancy is the return of colostrum. Colostrum is often called "liquid gold" because of its dense nutritional profile and immune-boosting properties. It is specifically designed for a newborn's tiny stomach.

Around the midpoint of your pregnancy, your body begins the process of lactogenesis I (the beginning stage of milk production) for the new baby. This means your mature milk changes back into colostrum.

Because colostrum is very different from mature milk, your nursing child might notice two things:

Volume: Colostrum is produced in very small amounts. If your child relies on breast milk for the majority of their calories, they will likely need more supplemental food or milk.
Taste: Colostrum is higher in sodium and protein and lower in lactose (sugar) than mature milk. This gives it a saltier, less sweet flavor. Some toddlers decide to wean on their own during this stage because they no longer like the taste or the effort required for such a small amount.

Nutrition and Hydration: Can They Stop the Drop?

It is a common misconception that you can "eat your way" out of a pregnancy-related supply drop. While nutrition is incredibly important, it is important to remember that this specific decrease is hormonal, not nutritional.

However, supporting your body is still vital. You are essentially doing three jobs at once: maintaining your own health, growing a new human, and producing milk for another. This requires a significant amount of energy.

Caloric Needs

You generally need about 300 to 500 extra calories per day for breastfeeding and another 300 or more for the pregnancy, depending on which trimester you are in. If you are not eating enough, your body will prioritize the pregnancy first, then your own needs, and lastly, the milk supply. Focus on nutrient-dense foods like avocados, nuts, seeds, and lean proteins.

Hydration is Essential

Breast milk is roughly 90% water. Dehydration can worsen a supply drop, so aim to drink plenty of fluids throughout the day. We offer several lactation drink mixes, such as our Pumpin' Punch™ or Milky Melon™ drink mixes, which provide a tasty way to stay hydrated while incorporating lactation-supportive ingredients.

What to Do Next:

Carry a water bottle with you everywhere to ensure you are drinking at least 100 ounces of fluid daily.
Eat small, frequent meals to keep your energy levels stable.
Listen to your body—if you are exhausted, your supply may reflect that.

Managing Nipple Sensitivity and Nursing Aversion

One of the hardest parts of nursing while pregnant isn't just the supply drop; it is the physical and emotional sensations that come with it. Many parents experience "nursing aversion" or intense nipple tenderness.

Nipple sensitivity is caused by the increase in estrogen and progesterone. It can make the latch feel like sandpaper or cause a sharp, pinching sensation. Nursing aversion is a psychological and physical feeling of wanting the nursing child to "get off" immediately. It is often accompanied by feelings of irritability or skin-crawling sensations.

If you are experiencing this, know that you are not a bad parent. It is a very common biological response to the high demands being placed on your body. To manage this:

Set Boundaries: If your child is a toddler, you can use a timer or "nursing songs" to limit the length of sessions.
Distraction: Read a book or watch a show with your child while they nurse to keep your mind occupied.
Skin Care: Use a high-quality nipple balm to keep the skin hydrated, as dryness can worsen sensitivity.

Is My Older Baby Getting Enough?

If you are breastfeeding a baby who is under one year old, a supply drop during pregnancy requires careful monitoring. Before six months, babies rely exclusively on breast milk or formula for nutrition. If your supply drops significantly during this time, you must work closely with your pediatrician to ensure the baby is gaining weight.

For babies between six and twelve months, breast milk is still the primary source of nutrition, but solids are being introduced. If your supply drops, you may need to increase their intake of solid foods or offer a supplement.

Signs of Adequate Intake:

The baby is having at least 6 heavy wet diapers a day.
The baby is meeting developmental milestones.
The baby is gaining weight according to their growth curve.

If you are concerned, a "weighted feed" (weighing the baby before and after a nursing session) with a certified lactation consultant can give you a clear picture of how much milk they are actually receiving. Milky Mama's breastfeeding resource center also offers guidance on diaper counts, weight gain, and signs that your baby is feeding well.

Should You Use Lactation Supplements While Pregnant?

Many moms reach for herbal supplements when they notice their supply dipping. At Milky Mama, we offer several herbal lactation supplements, such as Lady Leche™, Dairy Duchess™, or Milk Goddess™. These are designed to support milk production using traditional galactagogues—substances that may help support lactation.

However, it is vital to consult with your healthcare provider before starting any herbal supplement while pregnant. Some herbs that are safe during breastfeeding may not be recommended during pregnancy because they can affect uterine tone. Always prioritize the safety of your current pregnancy.

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

The Decision to Wean or Tandem Nurse

As your supply drops, you may find yourself at a crossroads. Some parents choose to use this natural decrease as a time to gently wean their older child. Others feel strongly about continuing to nurse and transition into tandem nursing once the new baby arrives.

Choosing to Wean

If the nipple pain or nursing aversion becomes too much, weaning is a valid and healthy choice. Your well-being matters. You can wean gradually by dropping one feeding at a time and replacing it with a snack, a cup of milk (if age-appropriate), or extra cuddles.

Choosing to Tandem Nurse

If you choose to continue, your supply will likely stay low until you give birth. Once the placenta is delivered, your progesterone levels will "crash," and your prolactin will take over again. This triggers your milk to "come in." You will then have a supply tailored to the newborn, but there is usually plenty for a toddler as well. Many parents find that tandem nursing helps with sibling bonding and helps reduce the engorgement that often happens in the early days postpartum.

Summary and Next Steps

When your milk supply drops during pregnancy, it is a sign that your body is working hard to support a new life. While the dip usually happens most significantly in the second trimester, the transition can start much earlier. Remember that every drop counts, but your comfort and health are equally important.

Understand the timing: Most people see a drop between months 4 and 5 of pregnancy.
Watch for changes: Be aware of shifting milk flavor and volume as mature milk transitions to colostrum.
Prioritize yourself: Increase your calories and hydration to support the demands of pregnancy and lactation.
Monitor your child: Ensure your nursing baby or toddler is still getting the calories they need from other sources if your supply is low.

Breastfeeding during pregnancy is a remarkable feat of the human body. Whether you nurse through the entire nine months or decide to transition to weaning, you are doing an amazing job providing for your children.

If you need extra support during this transition, we are here for you. Whether it is through our supportive community or our specialized lactation products, our goal is to make your journey a little easier. You can also explore Breastfeeding 101 for additional education on milk production, feeding expectations, and determining whether your baby is getting enough milk.

FAQ

Will my milk supply definitely drop if I get pregnant?

While nearly all breastfeeding parents experience some level of decrease due to hormonal changes, the extent of the drop varies. Most will notice a significant change by the middle of the second trimester as progesterone levels rise and milk transitions to colostrum.

Can I increase my supply while pregnant using a pump?

Pumping can provide extra stimulation, but it often cannot override the hormonal signals of pregnancy. While it might help maintain a small amount of milk, it is unlikely to return your supply to pre-pregnancy levels until after the new baby is born and hormones reset.

Is it safe to continue breastfeeding while pregnant?

For most healthy pregnancies, breastfeeding is perfectly safe and does not increase the risk of miscarriage or preterm labor. However, if you have a history of preterm labor or are experiencing complications, you should discuss your nursing plan with your OB-GYN or midwife. If you need individualized guidance about low supply, pumping, or breastfeeding difficulties, virtual lactation consultations may be helpful.

Will my toddler be upset by the change in milk?

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When Does Your Milk Supply Drop When Pregnant: What to Expect

Table of Contents

Introduction

The Role of Hormones in Pregnancy and Lactation