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
The Hormonal Shift: Why Supply Changes
When Does the Supply Drop Usually Happen?
Signs Your Supply is Dropping During Pregnancy
Managing Your Older Child’s Nutrition
Nipple Sensitivity and Nursing Aversion
Nutrition and Hydration for the Pregnant, Nursing Mom
Is it Safe to Breastfeed While Pregnant?
Preparing for Tandem Nursing
Action Steps for the Pregnant Breastfeeding Mom
The Emotional Aspect of a Supply Drop
FAQ
Conclusion

Introduction

Finding out you’re expecting again while still breastfeeding your current little one can bring up a whirlwind of emotions. You might feel a mix of excitement, surprise, and a little bit of worry about how your body will handle the demands of "nursing for two." One of the most common questions we hear at Milky Mama is, "Does pregnancy cause milk supply to drop?" It is a valid concern, especially if your older child is still heavily dependent on breast milk for their primary nutrition.

In this article, we will explore the biological reasons why your supply might shift during pregnancy, when you can expect these changes to happen, and how to manage the transition. We will also cover the physical sensations you might experience and how to ensure both you and your babies are getting the nourishment you need. While every pregnancy is different, understanding the hormonal landscape can help you feel empowered as you navigate this new chapter.

Pregnancy naturally triggers significant hormonal shifts that can lead to a decrease in milk volume for most breastfeeding parents, and if you want extra support during that transition, our Emergency Lactation Brownies are a popular place to start.

The Hormonal Shift: Why Supply Changes

Breastfeeding is often described as a "supply and demand" process. Under normal circumstances, the more your baby removes milk, the more milk your body creates. However, pregnancy introduces a different regulatory system: the endocrine (hormonal) system. When you become pregnant, your body’s priorities shift to supporting the developing fetus, and this can override the typical supply and demand cycle.

Progesterone and Estrogen vs. Prolactin

During pregnancy, your levels of estrogen and progesterone rise significantly. These hormones are essential for maintaining a healthy pregnancy, but they have a specific effect on lactation. Progesterone, in particular, is known to inhibit the action of prolactin on the breast tissue.

Prolactin is the hormone responsible for "telling" your breasts to produce milk. When progesterone levels are very high, as they are during pregnancy, the milk-making cells don't respond to prolactin as effectively. This means that even if your older child is nursing frequently or you are pumping around the clock, you may still see a noticeable dip in your output.

The Shift to Colostrum

Around the middle of your pregnancy—usually between the fourth and fifth months—your milk begins to transition back into colostrum. Colostrum is the "liquid gold" produced in the final stages of pregnancy and the first few days after birth. It is incredibly nutrient-dense and packed with antibodies, but it is produced in much smaller volumes than mature milk.

This transition is a biological preparation for the new baby. While colostrum is perfect for a newborn’s tiny stomach, your older toddler may notice the change in volume and the change in taste. Colostrum is typically saltier and less sweet than mature breast milk, which sometimes leads to "nursing strikes" or even self-weaning.

When Does the Supply Drop Usually Happen?

For many parents, the drop in milk supply is one of the very first signs of pregnancy, sometimes appearing even before a positive pregnancy test. However, the timeline varies for everyone.

The First Trimester

It is common to notice a slight decrease in the first few weeks. You might find that your breasts don't feel as "full" as they used to, or your baby might become more fussy at the breast. If you are pumping, you may see the number of ounces in your collection bottle start to dwindle.

The Second Trimester

This is when the most significant drop usually occurs. Studies and anecdotal evidence suggest that about 70% of breastfeeding parents experience a significant decrease in milk supply during the second trimester. By this stage, the hormonal environment is firmly geared toward the new pregnancy, and the transition to colostrum is often underway.

Individual Variation

It is important to remember that every body is different. A small percentage of people find that their supply remains relatively stable until later in the pregnancy. Others may find that their milk dries up almost entirely by the end of the first trimester. Your experience may also differ from one pregnancy to the next.

Key Takeaway: While supply and demand still matter, pregnancy hormones are the "boss" of your milk supply, and a drop in volume is a normal, physiological response to being pregnant.

Signs Your Supply is Dropping During Pregnancy

If you aren't pumping, it can be hard to know for sure if your supply is changing. However, your baby or toddler will often give you clues.

Increased Fussiness: Your child may pull at the breast, cry during feedings, or seem frustrated that the milk isn't flowing as fast as it used to.
Longer Nursing Sessions: In an attempt to get more milk, your child might stay at the breast much longer than usual.
More Frequent Feedings: You might feel like you’re back in the newborn "cluster feeding" stage as your child tries to signal your body to make more milk.
Change in Pumping Output: If you use a pump, you will likely see a literal decrease in the amount of milk you can express.
Physical Changes: Your breasts may feel softer, and you may no longer feel the "tingle" of the let-down reflex as clearly as before.

If the frequent feeding pattern feels intense, our guide on how cluster feeding affects milk supply can help you understand what’s normal.

Managing Your Older Child’s Nutrition

If your child is under one year old, breast milk (or formula) is still their primary source of nutrition. A drop in supply during pregnancy can be more concerning in this age group than it is with a toddler who is eating a variety of solid foods.

Children Under Six Months

If you are pregnant and your baby is under six months old and exclusively breastfed, you must monitor their weight gain and diaper output closely. Since their nutrition depends entirely on your milk, a significant drop in supply may require supplementation. We recommend working closely with a pediatrician and an IBCLC (International Board Certified Lactation Consultant) to ensure your baby is getting enough calories.

Children Between Six and Twelve Months

At this age, babies are usually starting solids but still need the calories and fats found in breast milk. If your supply drops, you may need to increase the frequency of their solid meals or offer small amounts of donor milk or formula, depending on your healthcare provider's advice.

Toddlers (Over One Year)

For toddlers, breastfeeding is often more about comfort and connection than it is about primary calories. If your supply drops, they can typically make up the nutritional difference with solid foods and water. Many toddlers continue to "dry nurse" (nursing when little to no milk is present) throughout pregnancy because they value the closeness.

Nipple Sensitivity and Nursing Aversion

Does pregnancy cause milk supply to drop? Yes, but it also causes other physical changes that can make breastfeeding challenging. Nipple soreness is one of the most common early pregnancy symptoms. This isn't just the typical tenderness you might feel during ovulation; for many, it can be quite intense.

Dealing with Soreness

Hormonal changes make the skin of the nipples more sensitive. You might find that the latch that used to be comfortable now feels painful. To manage this, you can try:

Adjusting the nursing position to ensure a very deep latch.
Using hydrogel pads or soothing nipple balms.
Distracting yourself with a book or show during the feeding.
Setting boundaries with older toddlers by using a timer for nursing sessions.

Understanding Nursing Aversion

Some parents experience a phenomenon called "nursing aversion" or "Breastfeeding Agitation and Aversion" (BAA) during pregnancy. This is an intense feeling of irritability, skin-crawling, or an urgent desire to unlatch the baby. It is a biological response that is not well understood but is very real. If you experience this, know that you are not alone and it doesn't mean you are a bad parent. It is a physical reaction to the hormonal cocktail of pregnancy.

Nutrition and Hydration for the Pregnant, Nursing Mom

Your body is doing incredible work right now. You are growing a new human, producing milk (even if in smaller amounts), and keeping yourself fueled. This requires a significant amount of energy.

Caloric Needs

When you are breastfeeding, you generally need about 500 extra calories a day. When you are pregnant, you need additional calories for the developing baby, especially in the second and third trimesters. If you are doing both, your nutritional needs are at an all-time high. Focus on nutrient-dense foods:

Healthy fats like avocados, nuts, and seeds.
Protein sources like eggs, lean meats, beans, and lentils.
Whole grains like oats and quinoa.

The Importance of Hydration

Hydration is crucial for both pregnancy and lactation. While drinking more water won't necessarily "override" the hormonal drop in milk supply, dehydration will certainly make a low supply worse. It can also lead to Braxton Hicks contractions or fatigue.

Our Pumpin' Punch™ drink mix is a refreshing way to stay hydrated, and the full lactation drink mixes collection gives you a few more options to explore.

Supplementing Your Diet

Many moms look for extra support during this time. We offer various lactation treats like our Emergency Lactation Brownies, which are a convenient way to support your overall wellness and nutrition.

Disclaimer: Our products are not intended to diagnose, treat, cure, or prevent any disease. Always consult with your healthcare provider or a certified lactation consultant before starting any new herbal supplements or making significant changes to your diet while pregnant or breastfeeding.

While some of our herbal supplements like Lady Leche™ are popular for supporting supply, our lactation supplements collection is a helpful place to compare options before checking with your midwife or OB-GYN.

Is it Safe to Breastfeed While Pregnant?

A common myth is that breastfeeding during pregnancy can cause a miscarriage or early labor. For a healthy, low-risk pregnancy, breastfeeding is generally considered safe.

The concern usually stems from the hormone oxytocin. Oxytocin is released during breastfeeding to help with the let-down reflex, and it is also the hormone that causes uterine contractions. However, in a normal 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 trigger preterm labor.

However, you should talk to your healthcare provider if you have a history of preterm labor, are carrying multiples, or are experiencing unexplained vaginal bleeding or pain.

Preparing for Tandem Nursing

If you decide to continue breastfeeding through your pregnancy, you may end up "tandem nursing"—feeding both your newborn and your older child. This can be a beautiful way to help your older child bond with the new baby and ensure they still feel connected to you.

What to Expect with Tandem Nursing

The Return of Supply: Once you give birth and your "real" milk (mature milk) comes in, your supply will likely skyrocket. Your body will produce enough for both children.
The Newborn Comes First: It is usually recommended to let the newborn nurse first to ensure they get the colostrum and the best "top" of the milk, as they are entirely dependent on it.
Managing the Load: Nursing two children is physically demanding. You will need to be even more diligent about your own rest and nutrition.

If you want more hands-on guidance for the transition, our Certified Lactation Consultant Breastfeeding Help page is a good place to start.

Action Steps for the Pregnant Breastfeeding Mom

If you’ve noticed your supply dropping and want to navigate this time with as much ease as possible, here is a quick action plan:

Confirm the Pregnancy: If you haven't already, take a test so you know exactly why your body is changing.
Evaluate Your Child's Needs: Is your child under one? If so, talk to a pediatrician about whether they need supplemental nutrition.
Boost Your Nutrition: Add an extra 300–500 calories of nutrient-dense food to your daily intake.
Stay Hydrated: Drink plenty of water and consider electrolyte-rich drinks like our Lactation LeMOOnade™.
Listen to Your Body: If nursing becomes too painful or if you experience intense aversion, it is okay to set boundaries or even begin the weaning process. Your well-being matters too.
Seek Support: Join a community of other "nursing while pregnant" moms, book a virtual consultation with an IBCLC, or check out our courses collection if you want a more structured learning path.

Key Takeaway: You're doing an amazing job. Whether you continue to nurse through your pregnancy or decide it's time to wean, you are making the best choice for your unique family.

The Emotional Aspect of a Supply Drop

It can be emotionally difficult to see your milk supply decrease, especially if breastfeeding has been a major part of your bond with your child. You might feel guilty or like you are "taking something away" from your first baby to give to the second.

Please be gentle with yourself. Breasts were literally created to feed human babies, and they are doing exactly what they are programmed to do by preparing for the new arrival. Your older child is growing, and their relationship with you is about so much more than just milk. The cuddles, the eye contact, and the comfort you provide are just as important as the ounces in the bottle or the minutes at the breast.

If your supply drops to the point where your child loses interest or you choose to wean, try to find new ways to connect. Extra storytime, special "big kid" snacks, or more skin-to-skin snuggles can help bridge the gap. You can also find encouragement in the Official Milky Mama Lactation Support Group on Facebook.

FAQ

Does every woman's milk supply drop during pregnancy?

While a vast majority of women (estimated at 70% or more) experience a significant drop in milk supply, it is not universal. Some women maintain enough supply to continue nursing throughout their entire pregnancy, though the composition of the milk will still change to colostrum.

Can I use lactation supplements to keep my supply up while pregnant?

Some supplements may help support your nutritional needs, but they often cannot overcome the hormonal shift caused by pregnancy. Progesterone is a very powerful inhibitor of milk production, and most galactagogues are not strong enough to override those pregnancy hormones.

Will my milk taste different to my baby while I'm pregnant?

Yes, many babies and toddlers notice a change in taste. As mature milk transitions back to colostrum around the fourth or fifth month, it becomes less sweet and more salty, which can lead to some children self-weaning.

Is it normal for my nipples to hurt while breastfeeding during pregnancy?

Yes, nipple sensitivity is one of the most common complaints of pregnant, breastfeeding parents. This is due to the increase in estrogen and progesterone, which makes the skin more sensitive and can make the initial latch feel quite painful.

Conclusion

Navigating a milk supply drop during pregnancy can feel like a challenge, but it is a very normal part of the journey. The hormonal changes your body is undergoing are designed to support the new life growing inside you, and while that often means less milk for your older child, it doesn't mean your breastfeeding relationship has to end. By staying hydrated, focusing on your nutrition, and monitoring your child’s growth, you can make the best decisions for your family.

Pregnancy hormones like progesterone naturally suppress milk production.
Most supply drops occur significantly in the second trimester.
Milk eventually transitions to colostrum, which may change the taste and volume.
For healthy pregnancies, nursing is generally safe for both the mother and the baby.

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