Does Your Milk Supply Increase if You Get Pregnant? What to Expect

Posted on February 23, 2026

Breastfeeding While Pregnant: Does Your Milk Supply Increase?

Introduction
Understanding the Hormonal Shift
Does Your Milk Supply Ever Increase During Pregnancy?
Changes in Milk Taste and Composition
Common Challenges When Nursing While Pregnant
Nutrition and Self-Care for the Pregnant Breastfeeding Mom
Supporting Your Older Child Through the Transition
Tandem Nursing: What Happens After Birth?
Practical Tips for Managing the Transition
Conclusion
FAQ

Introduction

If you have recently seen a positive pregnancy test while still nursing your older child, you likely have a million questions spinning through your mind. You might be wondering if your body can handle the demands of growing a new life while continuing to nourish another. One of the most common questions we hear at Milky Mama is: does your milk supply increase if you get pregnant? It is a natural concern, especially if you were hoping to continue your breastfeeding journey throughout your pregnancy.

If you need personalized guidance, our Certified Lactation Consultant Breastfeeding Help page is a great place to start.

The short answer is that for the vast majority of mothers, milk supply actually decreases during pregnancy rather than increasing. This change is driven by the complex hormonal shifts required to support a developing fetus. While this news might feel discouraging, understanding the "why" behind these changes can help you navigate the coming months with confidence and grace.

In this article, we will explore why milk production dips during pregnancy, how the composition of your milk changes, and what you can do to support yourself and your nursing child. While pregnancy introduces new challenges to lactation, many families find that with the right support and information, they can continue to breastfeed successfully. For more on that season specifically, see our guide on breastfeeding through pregnancy.

Understanding the Hormonal Shift

To understand why your milk supply changes during pregnancy, we have to look at the hormones involved. Breastfeeding is typically a "supply and demand" process. When your baby removes milk, your body produces more. However, when you are pregnant, your endocrine system takes over the driver’s seat, and the usual rules of supply and demand often take a backseat.

The Role of Progesterone

The primary reason for a drop in milk supply is the rise of progesterone. This hormone is essential for maintaining a healthy pregnancy. It helps the uterus grow and prevents it from contracting too early. However, progesterone also has a specific effect on the milk-making cells in your breasts, known as alveoli.

High levels of progesterone make these cells more "leaky" or permeable. This means they cannot store milk as effectively as they did before you were pregnant. Progesterone also acts as a bit of a brake on prolactin, which is the hormone responsible for making milk. Until the placenta is delivered after your new baby is born, these high progesterone levels will likely keep your milk volume lower than usual.

When the Decrease Usually Occurs

Most mothers notice a significant dip in their milk supply by the end of the first trimester or the beginning of the second. For some, it happens as early as the first month. By the fourth or fifth month, the decrease is often quite noticeable.

Because this change is hormonal, common techniques like power pumping or increasing nursing frequency often do not have the same boosting effect they would under normal circumstances. Your body is prioritizing the pregnancy, and the hormonal signals to reduce milk volume are very strong.

Does Your Milk Supply Ever Increase During Pregnancy?

While the overall volume of mature milk decreases, there is a point later in pregnancy where you might feel a shift. This is not necessarily an increase in "volume" in the way you are used to, but rather a change in the type of milk you are producing.

Around the middle of your second trimester, usually between weeks 16 and 22, your body begins a process called "stage one lactogenesis." This is when your breasts begin to produce colostrum. Colostrum is often called "liquid gold" because it is highly concentrated, nutrient-dense, and packed with antibodies.

For some mothers, the transition to colostrum production can make the breasts feel slightly fuller again. However, colostrum is produced in much smaller quantities than mature milk. So, while your body is "increasing" its production of this specific, vital substance for your upcoming newborn, the total amount of fluid available for your older nursing child will still be much lower than it was before you conceived.

Key Takeaway: Your milk supply will likely decrease significantly during pregnancy due to high progesterone levels. While your body begins making colostrum in the second trimester, the total volume of milk remains low until after you give birth.

What to Do Next:

Observe your child’s nursing patterns for signs of frustration or changes in behavior.
Monitor your child's weight if they are under one year old and rely on your milk as their primary nutrition.
Focus on hydration and nutrition to support your own energy levels.

Changes in Milk Taste and Composition

It isn't just the amount of milk that changes during pregnancy; the flavor and nutritional makeup change too. As your body prepares for the new baby, the milk transitions from mature milk back into colostrum.

Why the Taste Changes

As the volume of milk drops, the concentration of certain minerals and proteins increases. Specifically, the levels of sodium and protein go up, while the levels of glucose (sugar) and lactose decrease. This makes the milk taste saltier and less sweet than your older child is used to.

Some toddlers and older babies are very sensitive to this change. They may make faces, pull away, or even decide to wean on their own because they no longer enjoy the flavor. Other children don’t seem to mind at all and will continue to nurse for comfort, regardless of the taste or the amount they are getting.

The Laxative Effect of Colostrum

Colostrum has a natural laxative effect designed to help a newborn pass their first stools (meconium). If your older child continues to nurse as your milk transitions to colostrum, you might notice that their stools become softer or more frequent. This is completely normal and not a cause for concern, provided they are otherwise healthy and hydrated.

Common Challenges When Nursing While Pregnant

Beyond the drop in supply, breastfeeding while pregnant can bring about physical and emotional challenges that many mothers find surprising.

Nipple Tenderness

One of the earliest signs of pregnancy for many is extreme nipple sensitivity. This is caused by the same hormonal changes that affect your supply. For a breastfeeding mother, this can make a previously comfortable latch feel painful or even unbearable.

You might find that you need to be more mindful of your child's latch. Even a slightly shallow latch that didn't bother you before might now feel very sharp. Using a high-quality nipple balm or practicing different positions can help, but for many, the tenderness is something that simply has to be managed until the hormones level out later in the pregnancy.

Nursing Aversion and Irritability

Some mothers experience a phenomenon known as "nursing aversion" or agitation. This is an intense feeling of skin-crawling, irritability, or a desire to "get the baby off" as soon as they latch. It can be a very distressing feeling, especially if you have always enjoyed your breastfeeding relationship.

If you experience this, know that you are not alone and it is not your fault. It is a physiological response to the hormones and the physical demands of pregnancy. Many moms manage this by setting boundaries, such as "nursing until I count to ten" or using distraction techniques like reading a book together while nursing.

Nutrition and Self-Care for the Pregnant Breastfeeding Mom

Your body is doing incredible work right now. You are growing a human, producing milk, and likely chasing an older child around. This requires a significant amount of energy and nutrients.

Meeting Increased Caloric Needs

When you are both pregnant and breastfeeding, your caloric needs are higher than if you were doing just one or the other. It is important to eat nutrient-dense foods that provide sustained energy.

Protein: Essential for the growth of the baby and your own tissue repair.
Healthy Fats: Support the baby's brain development and keep you feeling full.
Calcium: Your body will prioritize the baby and the milk, so you need to ensure you are getting enough calcium for your own bone health.

At Milky Mama, we understand that finding the time to eat a full, balanced meal isn't always easy when you're a busy parent. Our Emergency Brownies are a popular choice for moms looking for a delicious snack that includes ingredients like oats and flaxseed. These ingredients are great for general wellness and can provide a much-needed calorie boost during a busy afternoon.

The Importance of Hydration

Hydration is critical during pregnancy to support increased blood volume and amniotic fluid. When you add breastfeeding to the mix, your fluid needs go up even more. If you find plain water boring, our Lactation LeMOOnade™ or Pumpin' Punch™ are refreshing ways to stay hydrated.

Key Takeaway: Prioritize your own well-being. Pregnancy and breastfeeding simultaneously is a marathon, not a sprint. Proper nutrition and hydration are your best tools for maintaining your energy.

Supporting Your Older Child Through the Transition

How you handle the drop in supply depends largely on the age of your nursing child.

If Your Baby is Under One Year Old

If your nursing child is under 12 months, breast milk or formula must remain their primary source of nutrition. Because your supply will likely drop during pregnancy, it is vital to monitor their weight gain and wet diapers closely.

If your supply drops to a point where your baby is not gaining weight or is showing signs of hunger, you may need to supplement with expressed milk (if you have a freezer stash) or formula. Always consult with your pediatrician or an International Board Certified Lactation Consultant (IBCLC) to ensure your baby is getting the calories they need.

If Your Child is a Toddler

For toddlers over the age of one, breast milk is a wonderful supplement to their diet but is no longer their main source of calories. If your supply drops, they can simply eat more solid foods and drink water or other age-appropriate milks to meet their needs.

Many toddlers continue to nurse during pregnancy for comfort, connection, and the immune benefits that even small amounts of milk provide. If they seem frustrated by the low volume, you can offer a snack or a drink before or after a nursing session to keep them satisfied.

Tandem Nursing: What Happens After Birth?

If you continue to breastfeed throughout your pregnancy, you will move into what is called "tandem nursing" once the new baby arrives. This means you will be nursing both the newborn and the older sibling.

The Return of the Supply

The moment the placenta is delivered after birth, your progesterone levels plummet. This "opens the floodgates" for prolactin to take over. Within a few days, your mature milk will "come in," and your supply will increase dramatically.

Your body is incredibly smart. It will adjust its production to meet the needs of both children. In fact, tandem nursing mothers often have a very robust milk supply because they have two "customers" signaling the body to make more milk.

Prioritizing the Newborn

When tandem nursing, it is important to remember that the newborn has the most critical nutritional needs. In the early days, many lactation experts recommend ensuring the newborn nurses first to ensure they get plenty of colostrum and the "first dibs" on the mature milk as it comes in. Once the newborn has finished, the older sibling can nurse.

Interestingly, the older sibling can actually help the newborn by relieving engorgement. If your milk comes in forcefully and the newborn has trouble latching on a very full breast, the older child can "soften" the breast, making it easier for the tiny newborn to latch.

Practical Tips for Managing the Transition

Breastfeeding during pregnancy is a journey of constant adaptation. Here are a few practical tips to help you manage the changes:

Set Boundaries: If nursing becomes uncomfortable due to nipple pain or aversion, it is okay to shorten nursing sessions.
Encourage Solids: For older babies and toddlers, focus on offering a variety of healthy solid foods to ensure they are full and satisfied.
Check the Latch: Be extra vigilant about how your child is latching. A deeper latch can often mitigate some of the pregnancy-related nipple tenderness.
Rest When Possible: Your body is doing double duty. Side-lying nursing can be a great way to get some rest while still meeting your child's needs.
Seek Support: Join a support group or speak with a lactation professional. Sharing your experiences with others who have been there can be incredibly validating.

Conclusion

While your milk supply does not increase when you get pregnant—and in fact, usually decreases—this doesn't mean your breastfeeding journey has to end. The hormonal shifts that cause the drop in volume are a natural and necessary part of supporting your new pregnancy.

Supply usually drops in the first or second trimester due to progesterone.
Milk composition changes to colostrum around the midpoint of pregnancy.
Your supply will return and likely increase significantly after the birth of the new baby.
Self-care, nutrition, and hydration are essential for the mother during this time.

Every mother’s experience is unique. Some children will choose to wean during pregnancy, while others will wait for the "milk party" to return after the baby is born. Whatever path your family takes, know that you are doing an amazing job. If you need extra support for your supply after your new little one arrives, we at Milky Mama are here to help with our range of lactation supplements and lactation snacks.

"Every drop counts, and your well-being matters just as much as the milk you produce."

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

FAQ

Why did my milk supply go down as soon as I got pregnant?

Your milk supply decreases because of the rise in progesterone levels during pregnancy. Progesterone is necessary to maintain the pregnancy, but it inhibits the action of prolactin, the hormone responsible for milk production. Additionally, it makes the milk-producing cells in the breast more permeable, making it harder for the body to store and maintain a high volume of milk.

Can I do anything to increase my supply while pregnant?

Because the decrease in supply is driven by pregnancy hormones, traditional methods like power pumping or herbal supplements often have limited effectiveness. Your body is prioritizing the needs of the developing fetus. The most important things you can do are to stay well-hydrated, eat a nutrient-dense diet, and monitor your nursing child's growth and satisfaction to ensure they are getting enough nutrition from other sources. If you want a deeper dive into supply-support strategies, try our timing your pumping with breastfeeding guide.

Does the change in milk taste mean it is bad for my child?

Not at all. The taste changes because the milk is transitioning toward colostrum, becoming saltier and less sweet. While some children might dislike the new flavor and choose to wean, the milk remains highly nutritious and safe. It still contains valuable antibodies and immune-boosting properties that benefit your child.

Is it safe to continue breastfeeding while I am pregnant?

For most women with a healthy, low-risk pregnancy, it is perfectly safe to continue breastfeeding. While nursing can cause mild uterine contractions due to the release of oxytocin, these are generally not a concern for a healthy pregnancy. However, if you have a history of preterm labor, are carrying multiples, or have been advised to avoid sexual activity during pregnancy, you should consult your healthcare provider about whether to continue breastfeeding. For more hands-on support, you can also explore our Breastfeeding 101 course.

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Does Your Milk Supply Increase if You Get Pregnant? What to Expect

Table of Contents

Introduction