Does Pregnancy Cause Milk Supply to Drop? What to Expect

Posted on April 09, 2026

Does Pregnancy Cause Milk Supply to Drop? What Every Mama Needs to Know

Introduction
Why Pregnancy Often Causes a Supply Drop
When to Expect a Decrease in Milk Production
Signs Your Supply Is Changing
Managing Breastfeeding Challenges During Pregnancy
Can You Boost Supply While Pregnant?
Other Factors That Influence Milk Supply
Is It Safe to Breastfeed During Pregnancy?
Preparing for Tandem Nursing
What to Do Next: A Quick Action Plan
Conclusion
FAQ

Introduction

Finding out you are pregnant while still breastfeeding your older child can bring up a whirlwind of emotions. You might feel excited about the new addition, but also anxious about how this change will affect your current nursing relationship. One of the most common questions we hear from parents in this situation is: does pregnancy cause milk supply to drop?

The short answer is yes, for many parents, a decrease in milk production is one of the earliest signs of a new pregnancy. This shift can feel discouraging, especially if your little one isn't quite ready to wean or if you had planned on tandem nursing—which is the practice of breastfeeding two children of different ages at the same time. At Milky Mama, we believe that education is the best tool for navigating these transitions with confidence.

In this article, we will explore why these supply changes happen, when you might notice them, and how you can support your body through the demands of both pregnancy and lactation. Our goal is to help you understand the science behind these shifts so you can make the best decisions for your growing family. Every drop counts, and your well-being matters just as much as the nutrition you provide.

Why Pregnancy Often Causes a Supply Drop

It is estimated that up to 70% of breastfeeding parents experience a noticeable decrease in milk supply during pregnancy. This isn't usually due to anything you are doing "wrong," but rather a biological response to the new life growing inside you. While breastfeeding is typically governed by the law of supply and demand, pregnancy introduces a hormonal override that changes the rules.

The Role of Hormones

During pregnancy, your body undergoes a massive hormonal shift. Levels of estrogen and progesterone rise significantly to support the developing fetus and maintain the pregnancy. Progesterone, in particular, is known to inhibit the production of milk.

In a typical breastfeeding journey, the removal of milk from the breast triggers the release of prolactin, the hormone responsible for making milk. However, the high levels of progesterone during pregnancy can interfere with how your breast tissue responds to prolactin. This means that even if your older child is nursing frequently, your body may not be able to maintain the same volume of milk it once did.

The Transition to Colostrum

As you move into the second trimester, usually around the fourth or fifth month, your breasts begin to transition from producing mature milk back to producing colostrum. Colostrum is often called "liquid gold" because it is a thick, concentrated, antibody-rich milk designed specifically for a newborn’s first days of life.

Because colostrum is produced in much smaller quantities than mature milk, this transition naturally results in a lower volume of liquid. This shift is a programmed part of lactogenesis, which is the clinical term for the process of milk production. Your body is essentially "resetting" itself to ensure that the new baby has exactly what they need the moment they are born.

When to Expect a Decrease in Milk Production

While every person is different, most parents notice a dip in supply quite early. Some even notice the change before they have a positive pregnancy test. For others, the supply drop is more gradual and becomes more apparent as the pregnancy progresses.

The First Trimester

For many, the supply drop begins in the first trimester. This is often accompanied by other common pregnancy symptoms like fatigue and nipple sensitivity. Because your body is working overtime to build a placenta and support a new embryo, it may divert resources away from milk production.

The Second Trimester

By the middle of the second trimester, the hormonal changes are in full swing. This is typically when the transition to colostrum occurs. You may notice that your breasts feel softer and less full. If you are pumping, you might see a significant decrease in the number of ounces you collect during a session.

Signs Your Supply Is Changing

If you are still nursing a toddler or an older infant, they will likely be the first to tell you that the supply has changed. Since you cannot always see how much milk is being produced when breastfeeding directly, paying attention to your child's behavior and your own physical cues is key.

Changes in Your Child’s Behavior

Children react to a supply drop in different ways. Some of the most common behaviors include:

Frustration at the breast: Your child may pull back, cry, or tug at the nipple because the milk is not flowing as quickly as it used to. This is often a result of a slower let-down reflex, which is the tingling sensation or the release of milk triggered by nursing.
Longer nursing sessions: Your child might stay at the breast much longer than usual, trying to get the volume they are accustomed to.
Increased interest in solids: If your child is old enough for solid foods, you might notice they suddenly have a much larger appetite for "real" food as they compensate for the decreased milk.
Self-weaning: For some children, the change in volume and the shift in taste (colostrum is saltier and less sweet than mature milk) may lead them to lose interest in nursing altogether.

Physical Indicators

You might also notice changes in your own body, such as:

Reduced pumping output: If you use a breast pump, you may see a decline in the amount of milk you can express, regardless of how long or often you pump.
Softer breasts: The feeling of "fullness" or engorgement often disappears during pregnancy.
Nipple tenderness: This is a very common pregnancy symptom that can make nursing feel uncomfortable or even painful.

Key Takeaway: A supply drop during pregnancy is primarily driven by hormones, not a lack of effort. Understanding that your body is prioritizing the new pregnancy can help alleviate the guilt many parents feel when their supply dips.

Managing Breastfeeding Challenges During Pregnancy

Nursing while pregnant is a physical feat. You are nourishing a child on the outside while growing one on the inside. This requires a significant amount of energy and patience.

Nipple Sensitivity and Comfort

Pregnancy hormones can make your nipples incredibly sensitive. For some, the sensation of nursing can become "skin-crawling" or painful. This is sometimes called "nursing aversion." To help manage this:

Ensure your child has a deep, comfortable latch.
Limit the duration of nursing sessions if you are in pain.
Apply soothing nipple balms or use cold compresses between feeds.

For personalized guidance with latch, nipple pain, or other breastfeeding challenges, consider booking a virtual lactation consultation with a certified lactation consultant.

Meeting Increased Nutritional Needs

Your body’s caloric requirements skyrocket when you are both pregnant and breastfeeding. You may need an additional 500 to 800 calories per day to support both processes. If you aren't eating enough, your body will prioritize the pregnancy, which can further impact your milk supply.

Focus on nutrient-dense foods, including:

Lean proteins: Beans, lentils, eggs, and lean meats.
Healthy fats: Avocado, nuts, and seeds.
Complex carbohydrates: Oats and whole grains.

Our Emergency Lactation Brownies are a popular choice for parents looking for a convenient, delicious snack packed with ingredients like oats and flaxseed that can support your energy levels and overall well-being during this demanding time.

For more ideas about nourishing your body, explore this guide to eating for your breastfeeding journey.

The Importance of Hydration

Staying hydrated is critical. Your body needs water to produce milk and to maintain the amniotic fluid for your developing baby. We recommend drinking at least 12–16 cups of fluid a day. If plain water feels boring, especially if you are dealing with pregnancy nausea, our Pumpin Punch™ and Milky Melon™ drink mixes can be a refreshing way to stay hydrated while incorporating lactation-supporting ingredients.

Can You Boost Supply While Pregnant?

This is the most challenging part for many parents to hear: because the supply drop is hormonal, traditional methods of increasing supply—like power pumping or nursing more frequently—may not be as effective as they were before you were pregnant.

While you may not be able to return to your pre-pregnancy volume, you can work to maintain the supply you do have. For additional information, read this gentle guide to breastfeeding and pumping.

Galactagogues: These are substances, such as certain herbs or foods, that may help support milk production. Common examples include oats, brewer's yeast, and moringa.
Herbal Support: Some parents find that gentle herbal supplements can help. Our Lady Leche™ lactation supplement is a nettle-based, non-concentrated herbal blend designed to support supply. However, it is vital to consult with your healthcare provider or a certified lactation consultant before starting any new supplement while pregnant.
Skin-to-Skin Contact: Spending time skin-to-skin with your nursing child can help boost oxytocin, which supports the let-down reflex and strengthens your bond.

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

Other Factors That Influence Milk Supply

While pregnancy is a major cause of supply drops, it isn't the only factor. Sometimes, a dip happens for other reasons, and it’s important to rule those out.

Stress and Exhaustion

The first trimester of pregnancy is notoriously exhausting. Chronic stress and lack of sleep can negatively impact your milk supply. When your body is in a state of high stress, it produces cortisol, which can interfere with the hormones needed for milk production.

Illness and Medication

Getting a cold or the flu while pregnant can temporarily lower your supply. Additionally, some medications commonly used for pregnancy symptoms or allergies, such as decongestants containing pseudoephedrine, can cause a significant dip in milk volume. Always check with your doctor before taking any over-the-counter medications.

Latch and Milk Removal

If your older child has changed their nursing habits—perhaps due to their own developmental milestones—they may not be removing milk as effectively. Remember, if milk is left in the breast, it sends a signal to your body to slow down production.

Is It Safe to Breastfeed During Pregnancy?

For the vast majority of people, breastfeeding while pregnant is perfectly safe. The old myth that breastfeeding causes miscarriage or preterm labor in healthy pregnancies has been largely debunked by research.

Uterine Contractions

It is true that nipple stimulation releases oxytocin, which can cause mild uterine contractions. However, in a normal, low-risk pregnancy, the uterus is not sensitive to these small amounts of oxytocin until very close to the end of the pregnancy. These contractions are usually similar to Braxton Hicks and are not strong enough to trigger labor.

When to Use Caution

You should discuss breastfeeding with your healthcare provider if you:

Are carrying multiples (twins, triplets, etc.).
Have a history of preterm labor or late-term miscarriage.
Are experiencing unexplained vaginal bleeding or uterine pain.
Have been advised to abstain from sexual intercourse during pregnancy.

Preparing for Tandem Nursing

If your goal is to continue nursing through your pregnancy and feed both your toddler and your newborn, you are embarking on the journey of tandem nursing. This can be a beautiful way to help your older child bond with their new sibling.

What to Expect After Birth

Once your new baby arrives, your milk supply will likely increase dramatically as your body enters the stage of lactogenesis II (when your milk "comes in"). Your toddler may suddenly become very interested in nursing again because the volume is higher and the milk is sweet mature milk once more.

Prioritizing the Newborn

While you can nurse both children, it is important to ensure the newborn gets the colostrum they need in those first few days. Many parents choose to nurse the newborn first to ensure they get the "prime" milk before the toddler has their turn.

What to Do Next: A Quick Action Plan

If you’ve noticed your supply dropping and you’re feeling overwhelmed, here are a few steps you can take:

Assess Your Goals: Decide if you want to push through the discomfort to maintain the nursing relationship or if this is a natural time to begin a gentle weaning process.
Focus on Nutrition: Increase your caloric intake with healthy fats and proteins. Keep snacks like our lactation treats and brownies nearby for easy fueling.
Prioritize Hydration: Carry a water bottle everywhere and consider lactation-friendly drink mixes to keep your fluids up.
Consult a Professional: Reach out to an International Board Certified Lactation Consultant (IBCLC) who has experience with nursing through pregnancy.
Check the Latch: Ensure your toddler’s latch is still correct to prevent nipple damage, especially as your sensitivity increases.

Key Takeaway: Every breastfeeding journey is unique. Whether you nurse all the way through your pregnancy or decide to wean, you are making the best choice for your family at this moment.

Conclusion

Navigating a milk supply drop during pregnancy can be an emotional and physical challenge. It is important to remember that your body is doing something incredible—supporting two different stages of human development at the same time. The decrease in supply is a normal, hormonal response, and while it can be frustrating, it does not mean your breastfeeding journey has to end if you aren't ready.

At Milky Mama, we are here to support you every step of the way, whether you need a boost of hydration from our Milky Melon™ drink mix or a supportive community to talk through your concerns. Remember, you're doing an amazing job, and your worth as a parent isn't measured in ounces.

Trust your body’s ability to prioritize your new pregnancy.
Be gentle with yourself regarding nipple sensitivity and fatigue.
Ensure you are eating and drinking enough to support your dual roles.

Take a deep breath and give yourself grace. You are providing a beautiful foundation for both of your children. If you need more personalized support, consider booking a virtual lactation consultation with our team to help you navigate your specific situation.

FAQ

When does milk supply typically drop during pregnancy?

Most parents notice a decrease in milk volume during the first trimester, often between weeks 6 and 12. By the second trimester, around week 16 to 20, the milk usually transitions to colostrum, which is produced in much smaller amounts.

Does the taste of breast milk change when you are pregnant?

Yes, the composition of your milk changes as you move through pregnancy. Mature milk is generally sweet, while colostrum is higher in sodium and protein, giving it a saltier, less sweet taste that some toddlers may find surprising.

Can I use lactation supplements to bring my supply back to normal while pregnant?

While galactagogues can support your body, they often cannot fully override the hormonal shift caused by pregnancy. It is essential to consult your healthcare provider before using any supplements, as some herbs are not recommended during pregnancy. You can also explore Milky Mama’s lactation supplement collection after discussing your options with a qualified professional.

Is it normal for my toddler to want to nurse more even if my supply is low?

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