Will My Breast Milk Supply Decrease if I Get Pregnant?

Posted on April 29, 2026

Introduction
Why Milk Supply Changes During Pregnancy
When Does the Supply Drop Usually Happen?
Signs Your Supply Is Decreasing
Managing Your Nursing Journey While Pregnant
Dealing with Nursing Aversions and Sensitivity
Can Supplements Help Maintain Supply?
The Safety of Nursing While Pregnant
Will My Supply Ever Come Back?
When to Consider Weaning
Nutritional Support for the Journey
Practical Tips for the Transition
Conclusion
FAQ

Introduction

Seeing a positive pregnancy test while you are still breastfeeding can bring up a whirlwind of emotions. You might feel excitement for your growing family, but it is also completely normal to feel a bit of anxiety about your current nursing journey. Many parents worry about whether they can continue to provide enough milk for their older child while their body focuses on growing a new baby.

At Milky Mama, we believe that education is the ultimate tool for empowerment during your lactation journey. If you want a structured place to start, our Breastfeeding 101 course can help you build that foundation. We hear this question often, and the short answer is that for most people, milk supply does decrease during pregnancy due to significant hormonal shifts. However, a drop in supply does not necessarily mean your breastfeeding relationship has to end unless you want it to.

This post will explore why these changes happen, what signs to look for, and how you can navigate nursing through pregnancy and beyond. Our goal is to provide the support and clinical insight you need to make the informed decisions that are best for your family. Understanding the physiological changes ahead can help you feel more prepared and less overwhelmed as your body does the incredible work of sustaining two little ones.

Why Milk Supply Changes During Pregnancy

The primary reason for a decrease in milk supply during pregnancy is hormonal. As soon as a fertilized egg implants in the uterus, your body begins a massive internal reorganization. Your endocrine system, which manages your hormones, shifts its priority toward maintaining the pregnancy. If you want a deeper dive into the science behind this season, our How to Support Your Milk Supply While Pregnant guide walks through the same big picture.

The main culprit for a supply drop is progesterone. This hormone is essential for a healthy pregnancy because it helps maintain the uterine lining and prevents the uterus from contracting too early. However, progesterone also acts as a natural inhibitor to milk production. During the initial stages of lactation, the drop in progesterone after birth is actually what signals your milk to "come in." When these levels rise again during pregnancy, they can send a signal to your mammary tissue to slow down production.

Estrogen also plays a role. High levels of estrogen, which are necessary to support your growing baby and placenta, can interfere with the way your body responds to prolactin. Prolactin is the hormone responsible for making milk. When your body becomes less sensitive to prolactin signals, your daily milk volume often begins to dwindle.

The Shift from Mature Milk to Colostrum

Another major change happens around the second trimester. Your body begins to transition from producing mature milk back to producing colostrum. Colostrum is the thick, yellowish "first milk" that is very high in protein and antibodies but much lower in volume than mature milk.

This transition is a biological preparation for the new baby. Your body is essentially resetting its clock to ensure that when the newborn arrives, they have access to the highly concentrated nutrients they need in those first few days. While colostrum is incredibly healthy, your nursing toddler or older infant might notice the change in both the amount available and the flavor. Colostrum tends to be saltier and less sweet than mature milk because it has higher levels of sodium and lower levels of lactose.

When Does the Supply Drop Usually Happen?

Every person responds to pregnancy differently, so there is no single timeline that applies to everyone. However, many nursing parents notice a change in their supply quite early. Some notice a dip as early as the first few weeks of pregnancy, often before they even realize they are pregnant.

For many, the most significant decrease occurs between the fourth and fifth months of pregnancy. By this point, the hormonal shift is well-established, and the transition toward colostrum is in full swing. For a broader overview of true versus perceived supply concerns, our Signs and Symptoms: How to Know if You Have Low Milk Supply guide can be helpful.

It is important to remember that this change is physiological. It is not caused by a "lack of trying" or a failure of the supply-and-demand system. While frequent nursing or pumping usually helps maintain supply in a typical breastfeeding relationship, the hormonal "brakes" applied by pregnancy are often stronger than the stimulation of the pump or the baby.

Signs Your Supply Is Decreasing

If you are wondering if your supply has already begun to shift, there are several signs you can look for. Being aware of these can help you manage your expectations and plan for your older child's nutritional needs.

Changes in Pump Output: If you regularly pump, you might see a smaller volume of milk in the bottles. You might find it takes longer to get a let-down, which is the reflex that causes milk to flow.
Baby's Behavior at the Breast: Your nursing child might spend more time at the breast, acting frustrated or pulling back. Conversely, some children may lose interest entirely because the milk is flowing more slowly or tastes different.
Increased "Dry" Nursing: You may notice that your child is still sucking for comfort, but you no longer feel the sensation of milk moving or hear frequent swallows.
Weight Gain Changes: If your nursing child is under a year old and relies primarily on breast milk for nutrition, a decrease in supply could impact their weight gain. In this case, monitoring their wet and dirty diapers is crucial.

If you need one-on-one guidance, our Certified Lactation Consultant Breastfeeding Help page connects you with personalized support.

Key Takeaway: A decrease in milk supply during pregnancy is a normal biological response to rising progesterone levels. It is not a reflection of your ability to nurse, but rather your body’s way of prioritizing the new pregnancy.

Managing Your Nursing Journey While Pregnant

If you choose to continue nursing through your pregnancy, you may need to make some adjustments to your routine. While you cannot "stop" the hormonal changes, you can support your body through the process.

Prioritize Hydration and Nutrition

Growing a baby and producing milk at the same time is a massive metabolic task. Your body requires significantly more calories and fluids than it did before you were pregnant. If you are dehydrated or undernourished, your body will prioritize the pregnancy first, then your own health, and finally your milk supply.

Focus on consuming nutrient-dense foods and staying hydrated throughout the day. Water is essential, but many moms find that electrolyte-rich drinks like our Pumpin' Punch™ provide better support. They offer a refreshing way to ensure you are getting the fluids you need to feel your best.

Focus on Rest

Fatigue is a major symptom of early pregnancy, and it can also impact your milk production. When you are exhausted, your stress hormones can rise, which may further inhibit your let-down reflex. Try to find small pockets of time to rest, even if it is just ten minutes of sitting down while your toddler plays.

Monitor the Younger Child’s Growth

If your nursing child is under six months old, they rely entirely on your milk for nutrition. If your supply drops significantly, you must work closely with a pediatrician or an International Board Certified Lactation Consultant (IBCLC). You may need to supplement with donor milk or formula to ensure they are getting enough calories. For children over one year who are eating plenty of solid foods, a drop in milk supply is usually less of a nutritional concern and more of a change in their comfort routine.

Dealing with Nursing Aversions and Sensitivity

While the focus is often on milk supply, many moms find that the physical sensation of nursing becomes a challenge during pregnancy. Increased nipple sensitivity is one of the earliest signs of pregnancy and can make nursing feel uncomfortable or even painful.

What is Nursing Aversion?

Nursing aversion is a phenomenon where a breastfeeding parent feels a strong urge to stop nursing or feels skin-to-skin contact is overwhelming. This is often described as a "creepy-crawly" feeling or sudden irritability when the child latches.

If you experience this, know that you are not alone. It is a very common experience for pregnant nursing moms. It doesn't mean you don't love your child or that you are doing anything wrong. It is often a result of hormonal shifts and your body’s natural instinct to protect its resources for the new pregnancy.

How to manage sensitivity and aversion:

Ensure your child has a deep, comfortable latch to minimize friction.
Set boundaries with older toddlers, such as "nursing until the end of a song."
Practice deep breathing or use distractions like a book or a show during nursing sessions.
Apply soothing nipple balms or cold compresses after feedings.

Can Supplements Help Maintain Supply?

Many parents wonder if they can use herbal supplements to boost their supply during pregnancy. While some herbs are excellent for supporting lactation, you must be cautious during pregnancy. Some herbs that are traditionally used to increase milk production should be avoided while pregnant because they may cause uterine contractions.

At Milky Mama, we always recommend consulting with your healthcare provider or a certified lactation consultant before starting any new supplement while pregnant. If your provider gives you the green light, products like our Pump Hero™ are designed to support milk supply using ingredients that many moms find helpful. However, it is vital to remember that even the strongest herbal support may not be able to fully override the hormonal "shutdown" caused by pregnancy.

What to do next:

Consult your OB-GYN or midwife about any lactation supplements you plan to take.

Track your child's wet diapers if they are under 12 months old.

Focus on eating an extra 300-500 calories of nutrient-dense food daily.

Listen to your body and don't be afraid to set nursing boundaries if you feel overwhelmed.

The Safety of Nursing While Pregnant

One of the most common myths is that nursing while pregnant can cause a miscarriage. For the vast majority of healthy, low-risk pregnancies, nursing is perfectly safe.

While nipple stimulation can release small amounts of oxytocin—the hormone responsible for uterine contractions—the amount released during nursing is typically not enough to trigger preterm labor in a healthy pregnancy. The uterus also becomes less sensitive to oxytocin during the first and second trimesters.

However, your healthcare provider may recommend weaning if you have a history of preterm labor, are carrying multiples (twins or more), or are experiencing vaginal bleeding or uterine pain. Always keep your midwife or doctor informed about your nursing status so they can monitor your pregnancy with all the facts.

Will My Supply Ever Come Back?

The good news is that your milk supply is not gone forever. Once you give birth to the new baby, your progesterone levels will plummet, and your prolactin levels will rise. This triggers the arrival of your mature milk again, usually within 2 to 5 days postpartum.

If you continue to nurse your older child through the pregnancy, you will likely experience a massive surge in supply after the new baby arrives. This is the beginning of tandem nursing—breastfeeding two children of different ages.

Preparing for Tandem Nursing

Tandem nursing can be a beautiful way to bond your children and ensure your older child still feels connected during the transition to a new sibling. Because your supply will be driven by the needs of two children, your body will often produce a very high volume of milk.

In the early days, it is important to ensure the newborn gets priority. The newborn needs the colostrum and the first milk to ensure they gain weight and stay healthy. Once the newborn has finished eating, the older child can nurse. Many moms find that their older child helps "manage" the engorgement that often happens when the milk first comes in.

When to Consider Weaning

Sometimes, the combination of a supply drop, nipple pain, and pregnancy fatigue leads a parent to decide that weaning is the best choice. This is a deeply personal decision, and there is no "right" or "wrong" time to wean.

If your supply drops so low that your older child is no longer interested, or if the physical discomfort of nursing is affecting your mental health, weaning can be a gentle and loving choice for both of you. You have already given your child an incredible start, and your well-being matters just as much as the nursing relationship.

If you decide to wean, do so gradually to avoid clogged ducts or mastitis. You can replace nursing sessions with extra cuddles, stories, or healthy snacks to maintain that close bond with your little one. You can also browse our lactation snacks collection if you want more support-friendly options.

Nutritional Support for the Journey

Because your body is working overtime, you might benefit from specific lactation-supportive foods that also provide nourishment for you. Our Emergency Lactation Brownies are a favorite among our community because they are packed with oats and flaxseed. These ingredients provide slow-release energy and fiber, which are beneficial during pregnancy, while also supporting your milk supply as much as possible.

Remember to take your prenatal vitamins consistently. Your body will pull nutrients from your own stores to provide for the baby and the milk. Staying on top of your vitamins ensures you don't end up depleted, which can make the fatigue of pregnancy feel even worse.

Practical Tips for the Transition

Navigating this transition requires patience and a bit of grace for yourself. Here are some practical steps you can take today:

Communicate with Your Older Child: If they are old enough to understand, explain that the milk is changing or that nursing might be shorter today.
Use Different Comfort Techniques: If your supply is low, your child may be seeking comfort rather than food. Offer more skin-to-skin contact, rocking, or singing.
Check the Latch: Pregnancy hormones can make your skin more sensitive. Even a slightly shallow latch that didn't bother you before might feel painful now.
Stay Positive: It is easy to feel like your body is "failing" your older child, but that is far from the truth. Your body is performing a miracle by sustaining one life while growing another.

Key Takeaway: Whether you continue to nurse through your pregnancy or decide it is the right time to wean, you are doing an amazing job. Every drop of milk you have provided is a gift, and your value as a parent is not tied to your milk volume.

Conclusion

The journey of breastfeeding while pregnant is unique for every family. While it is highly likely that your breast milk supply will decrease due to the natural rise in progesterone and the shift toward colostrum, this doesn't have to be the end of your nursing story. By staying hydrated, eating well, and listening to your body’s signals, you can navigate these changes with confidence.

At Milky Mama, we are here to support you every step of the way, whether you need a nutritional boost from our treats, a Milky Melon™ drink mix, or just a bit of encouragement from our community. Remember, your well-being is just as important as the milk you produce. You are doing incredible work, and every bit of effort you put into nourishing your children is worth celebrating.

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

FAQ

Will my milk supply always go down if I get pregnant?

While nearly everyone experiences some decrease in milk supply due to the rise in progesterone, the extent of the drop varies. Most people notice a significant decrease between the fourth and fifth months of pregnancy, and for some, the supply may stop entirely before birth.

Can I do anything to stop my milk supply from dropping?

Because the supply drop is driven by pregnancy hormones rather than demand, it is difficult to stop it entirely through traditional methods like extra pumping. However, staying well-hydrated, eating enough calories, and using lactation-supportive snacks may help you maintain what you have for as long as possible.

Is the milk still healthy for my toddler if I’m pregnant?

Yes, your milk remains highly nutritious throughout your pregnancy. As your body transitions to producing colostrum in the second trimester, the milk actually becomes even more concentrated with antibodies and proteins, though the flavor and consistency will change.

What if my child stops nursing on their own during my pregnancy?

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Will My Breast Milk Supply Decrease if I Get Pregnant?

Table of Contents

Introduction