Does Your Milk Supply Increase When Pregnant? What to Expect

Posted on February 16, 2026

Introduction
The Short Answer: Does Supply Increase or Decrease?
The Role of Hormones in Pregnancy and Lactation
How Your Older Child Might React
Managing Nipple Sensitivity and Discomfort
Supporting Your Body Through Nutrition
Is Breastfeeding During Pregnancy Safe?
Preparing for Tandem Nursing
What to Do Next: Your Action Plan
The Importance of Self-Compassion
Summary of Key Points
FAQ

Introduction

Finding out you are pregnant while still breastfeeding an older child can bring up a whirlwind of emotions. You might feel a sense of pride in your nursing journey, mixed with questions about how your body will handle the demands of a new pregnancy. One of the most common questions we hear is whether your milk supply will increase or decrease during this time. At Milky Mama, we believe that every drop counts and that you deserve clear, compassionate information to help you navigate these changes.

This post will explore the physiological changes that happen when you are breastfeeding for two. We will look at why supply usually shifts, how the composition of your milk changes, and how you can support your body through this transition. Our goal is to provide you with the tools and knowledge you need to feel empowered, whether you choose to continue nursing through your pregnancy or begin the weaning process. While every pregnancy is different, understanding the science of lactation can help you feel more in control of your journey.

The Short Answer: Does Supply Increase or Decrease?

For the vast majority of people, milk supply does not increase during pregnancy. In fact, it is very common to see a significant decrease in milk production. Most parents notice this drop by the middle of the second trimester, although some see changes as early as the first few weeks. This change happens regardless of how often you nurse or pump.

In a typical breastfeeding scenario, your body works on a supply-and-demand system. The more milk is removed, the more your body makes. However, during pregnancy, the powerful surge of hormones takes the driver's seat. These hormones override the usual supply-and-demand signals. Even if you increase your nursing sessions or add extra pumping sessions, your output may still decline because your body is prioritizing the needs of the developing baby in your womb.

For more detail about this hormonal shift, read Milky Mama’s guide to how to support and increase milk supply while pregnant.

The Role of Hormones in Pregnancy and Lactation

To understand why your supply changes, we have to look at what is happening inside your body. The primary hormone responsible for the drop in milk supply is progesterone. As soon as you become pregnant, your progesterone levels begin to rise steadily.

Progesterone plays a vital role in maintaining a healthy pregnancy, but it is also a natural inhibitor of milk production. It makes the alveoli—the small, grape-like sacs in your breasts where milk is made—more permeable, or "leaky." When these sacs are leaky, they cannot store milk as effectively. This is why many parents feel like their breasts are "empty" or soft even if they haven't nursed in hours.

At the same time, your body is undergoing a process called lactogenesis. This is the clinical term for the initiation of milk production.

Stage One Lactogenesis

This stage begins around the 16th to 22nd week of pregnancy. During this time, your mammary glands are preparing for the new baby. Your body begins to produce colostrum. Colostrum is often called "liquid gold" because it is a thick, concentrated milk packed with antibodies, proteins, and fats.

While your mature milk supply is decreasing, your body is busy making this nutrient-dense first food. You might notice your milk becoming thicker, yellower, or stickier. Some parents even see small leaks of colostrum on their shirts during the second or third trimester. This is a sign that your body is working exactly as it should to prepare for the arrival of your newborn.

How Your Older Child Might React

Because your milk is changing in both quantity and quality, your older child—often called a "nursling"—will likely notice. Every child reacts differently to these shifts.

Changes in Taste

The composition of your milk changes during pregnancy to look more like weaning milk or colostrum. This means it becomes higher in sodium and protein and lower in lactose (milk sugar) and potassium. For your child, this results in a saltier, less sweet flavor.

Some toddlers are not bothered by the taste at all and will continue to nurse just for the comfort and closeness. Others may make faces, pull away, or decide they no longer enjoy the experience. If your child begins to nurse less frequently, this is a natural part of the transition.

Changes in Volume

When the flow of milk slows down, older babies or toddlers might get frustrated. They may pull at the breast or nurse more frequently to try and "signal" for more milk. Conversely, they might lose interest and prefer to get their nutrition from solid foods or other age-appropriate liquids.

If your nursing child is under 12 months old, it is important to monitor their weight and diaper output closely. Since breast milk should be their primary source of nutrition for the first year, a significant drop in supply may mean you need to supplement with expressed milk or formula under the guidance of a pediatrician.

Key Takeaway: A decrease in milk supply during pregnancy is a normal, hormone-driven process. Your body is shifting its resources to support the new pregnancy and prepare colostrum for the newborn.

Managing Nipple Sensitivity and Discomfort

One of the biggest challenges of breastfeeding while pregnant isn't just the supply—it's the physical sensation. Hormonal shifts can make your nipples incredibly sensitive or even painful. This is often one of the first signs of pregnancy for breastfeeding parents.

The increase in estrogen and progesterone makes the breast tissue more tender. For some, the sensation of a child latching can feel like an intense "fingernails on a chalkboard" feeling, often referred to as nursing aversion. If you are experiencing this, you are not alone, and it does not make you a bad parent.

Tips for Comfortable Nursing

Check the Latch: Even an older child can develop a "lazy" latch. Ensure they are taking a deep mouthful of breast tissue to reduce friction on the nipple.
Set Boundaries: If your child is older, you can try "timed" sessions. You might use a song or a timer to let them know how long the session will last.
Use Distraction: If the sensation is bothersome, try reading a book or watching a show together while nursing to keep your mind occupied.
Keep it Short: It is okay to limit nursing sessions to just a few minutes for your own mental and physical well-being.

For personalized guidance with latch concerns, soreness, or nursing discomfort, consider professional breastfeeding help from a lactation consultant.

Supporting Your Body Through Nutrition

While you cannot "out-eat" the hormonal drop in supply caused by pregnancy, you can support your overall health and the quality of the milk you are producing. Your body is doing double duty—growing a baby and feeding another. This requires a significant amount of energy and nutrients.

Hydration is Essential

Dehydration can make a low supply feel even lower. It can also contribute to pregnancy fatigue and Braxton Hicks contractions. We recommend keeping a water bottle with you at all times. If plain water feels boring, especially if you are dealing with morning sickness, our Pumpin' Punch™ lactation drink mix is a great way to stay hydrated. It provides a refreshing flavor and contains ingredients that support lactation while keeping you replenished.

Nutrient-Dense Foods

Focus on foods that provide sustained energy. Oats, flaxseeds, and brewer’s yeast are traditional ingredients used to support milk supply. They are also packed with B vitamins and fiber, which are excellent for pregnancy health.

Our Emergency Lactation Brownies are a favorite for many moms because they are easy to grab when you are exhausted and need a calorie-dense snack. They contain ingredients designed to help you maintain whatever supply your body is capable of producing during this time.

Calcium and Vitamin D

During pregnancy and breastfeeding, your body’s demand for calcium increases. Interestingly, your body becomes more efficient at absorbing calcium from food when you are pregnant. To protect your bone health, include plenty of leafy greens, nuts, seeds, and dairy or fortified plant milks in your diet. Many lactation consultants also recommend a high-quality prenatal vitamin to ensure you aren't missing any key nutrients.

You can explore additional ideas in this guide to eating for your breastfeeding journey.

Is Breastfeeding During Pregnancy Safe?

A common worry for many parents is whether breastfeeding will take nutrients away from the developing baby or cause a miscarriage. For a healthy, low-risk pregnancy, breastfeeding is generally considered safe.

The Oxytocin Question

When you nurse, your body releases oxytocin. This is the same hormone that causes the uterus to contract during labor. However, in a healthy pregnancy, the uterus is not very sensitive to oxytocin until the very end. The amount of oxytocin released during a typical nursing session is usually not enough to cause the cervix to open or trigger preterm labor. It is similar to the amount of oxytocin released during exercise or sexual activity, both of which are usually safe during pregnancy.

When to Be Cautious

There are certain situations where your healthcare provider might suggest weaning for safety:

If you are carrying multiples (twins or more).
If you have a history of preterm labor.
If you are experiencing unexplained bleeding or uterine pain.
If you are not gaining enough weight to support the pregnancy.

Always discuss your breastfeeding plans with your OB-GYN or midwife. They can help you monitor your health and ensure that both the pregnancy and your nursing relationship are progressing safely.

Preparing for Tandem Nursing

If you choose to continue breastfeeding through your pregnancy, you may end up "tandem nursing." This means breastfeeding both your newborn and your older child at the same time. Many families find that tandem nursing helps the older sibling adjust to the new baby and prevents feelings of jealousy.

For a closer look at this experience, read about tandem breastfeeding and what it means to tandem nurse.

Will There Be Enough Milk?

This is a major concern for many, but the answer is usually a resounding yes! Once you deliver the placenta, your progesterone levels drop sharply. This signals the "prolactin surge," which causes your milk to "come in" and significantly increase in volume.

The human body is amazing at adapting to demand. When two children are removing milk, your body will respond by producing enough for both. In fact, tandem nursing parents often have a very robust milk supply.

Prioritizing the Newborn

The most important thing to remember with tandem nursing is that the newborn's nutritional needs come first. In the first few days after birth, the newborn needs the colostrum to build their immune system and pass their first stools.

Newborn First: Always offer the breast to the newborn first to ensure they get the colostrum they need.
The Older Child's Role: Your older child can actually help with supply issues like engorgement. If your breasts feel painfully full when your milk comes in, the older child is often much more efficient at removing milk than a newborn.
Monitor the Baby: As long as your newborn is gaining weight and having enough wet and dirty diapers, you can feel confident that tandem nursing is working.

What to Do Next: Your Action Plan

Navigating these changes can feel overwhelming, but taking small, proactive steps can help you feel more prepared.

Listen to your body: If you feel touched out or in pain, it is okay to shorten nursing sessions.
Prioritize rest: Pregnancy and lactation together are physically taxing. Take naps when you can.
Boost your nutrition: Focus on hydration and nutrient-dense snacks like oats and flax.
Communicate with your older child: If they are old enough, explain that "mommy's milk is changing" to help them understand the flow or taste shifts.
Seek support: Talk to a lactation consultant or join a support group for parents breastfeeding through pregnancy.

You can also browse the Breastfeeding Resource Center for guidance on milk supply, pumping, newborn feeding, and related topics.

Key Takeaway: You're doing an amazing job balancing the needs of two children. Whether you nurse until birth or wean tomorrow, your health and well-being are what matter most.

The Importance of Self-Compassion

As you navigate the question "does your milk supply increase when pregnant," remember that there is no "right" way to handle this. Some parents feel a deep desire to continue nursing as a way to stay connected to their older child. Others find that the physical or emotional toll is too much and decide that weaning is the best choice for their family.

At Milky Mama, founded by Krystal Duhaney, RN, BSN, IBCLC, we are here to support you in whatever path you choose. Breastfeeding is a beautiful tool, but it is not the only way to bond with your child. If you choose to wean, you are not "failing." You are simply transitioning to a new phase of parenting.

Every drop of milk you have already given your child has provided them with an incredible foundation of health. As your body prepares for its next big task—bringing a new life into the world—give yourself permission to be flexible. Your body was literally created to feed human babies, and it is doing exactly what it needs to do right now.

Summary of Key Points

Milk supply almost always decreases during pregnancy due to high progesterone levels.
Your milk will transition into colostrum around the middle of your pregnancy.
Changes in taste and flow may cause some children to wean naturally.
Nipple sensitivity and nursing aversion are common but manageable side effects.
Breastfeeding during a low-risk pregnancy is generally considered safe.
Tandem nursing is possible, and your body will increase production after the birth to meet the needs of both children.

"The journey of breastfeeding is rarely a straight line. Pregnancy adds a new curve to that path, but with the right support, you can navigate it with confidence."

FAQ

Does nursing during pregnancy take away nutrients from the unborn baby?

In most cases, no. If you are eating a balanced diet and taking your prenatal vitamins, your body will prioritize the needs of the developing fetus first, then the milk for your older child, and finally your own nutritional needs. Focus on nutrient-dense foods and staying hydrated to keep everyone healthy.

Will my older child "use up" all the colostrum before the baby is born?

No, colostrum is produced continuously throughout the later stages of pregnancy. It is not a "finite" amount that can be emptied. As your older child removes colostrum, your body will simply produce more until the birth of the baby triggers the transition to mature milk.

Is it okay to use lactation supplements like Pumping Queen™ while pregnant?

It is essential to consult with your healthcare provider before starting any herbal supplements during pregnancy. While many ingredients in our supplements are commonly used by breastfeeding parents, pregnancy changes how your body reacts to certain herbs. Always put safety first and get the "all clear" from your midwife or doctor.

You can browse the lactation supplements collection after your healthcare provider confirms that a supplement is appropriate for you.

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Does Your Milk Supply Increase When Pregnant? What to Expect

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