Does Pregnancy Decrease Breast Milk Supply? What You Need to Know
Posted on April 24, 2026
Table of Contents
- Introduction
- Does Pregnancy Decrease Breast Milk Supply?
- Why Does Milk Supply Drop During Pregnancy?
- When Does the Supply Drop Usually Happen?
- Signs Your Supply is Decreasing
- What to Do if Your Supply Drops
- Dealing with Nipple Sensitivity and Discomfort
- The Transition to Colostrum
- Can You Use Supplements to Increase Supply?
- Safety and Breastfeeding During Pregnancy
- Deciding Between Tandem Nursing and Weaning
- Nutritional Requirements for Nursing While Pregnant
- Managing Fatigue
- Finding Support
- Summary of Key Points
- 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 your growing family, but you may also feel concerned about how this change will affect your current nursing relationship. One of the most common questions parents ask during this time is whether pregnancy will cause their milk supply to drop. It is a valid concern, as your body is now balancing the needs of a developing fetus with the demands of a nursing child.
At Milky Mama, we know that every drop counts, and our virtual lactation consultations are here to provide the support you need during this transition. Whether you plan to continue nursing through your pregnancy or are considering weaning, having the right information is essential. In this post, we will explore the science behind how pregnancy affects lactation, what signs to look for, and how you can support your body through this journey. Pregnancy often leads to a decrease in milk supply due to hormonal shifts, but understanding these changes can help you navigate the path ahead with confidence.
Does Pregnancy Decrease Breast Milk Supply?
The short answer is yes. For the vast majority of people, milk supply will decrease during pregnancy. Studies suggest that up to 70% of breastfeeding parents notice a significant drop in their milk volume while pregnant. This is a physiological response to the new hormones circulating in your body. For a deeper dive, see our guide on how to support your milk supply while pregnant.
Breastfeeding is often a "supply and demand" process. Usually, the more your baby removes milk, the more milk your body makes. However, during pregnancy, your hormones take over the driver's seat. No matter how often your child nurses or how much you pump, the hormonal changes associated with pregnancy will likely cause the volume of your milk to decline.
While this can be frustrating, it is important to remember that it is not a failure of your body. Your body is simply prioritizing the growth of the new baby in your womb. For most, this decrease happens regardless of how much water they drink or how many lactation treats they eat. It is a natural part of the biological transition as your breasts prepare to nourish a newborn once again.
Why Does Milk Supply Drop During Pregnancy?
To understand why the drop occurs, we have to look at the hormones involved in both pregnancy and lactation. There are two main players here: progesterone and prolactin.
The Role of Progesterone
Progesterone is a hormone that is essential for maintaining a healthy pregnancy. As soon as you conceive, your progesterone levels begin to rise steadily. While progesterone is vital for the baby, it has a side effect on lactation: it inhibits the production of milk. High levels of progesterone essentially act as a "brake" on your milk-making cells.
The Role of Prolactin
Prolactin is the hormone responsible for telling your body to make milk. Usually, prolactin levels rise in response to nursing or pumping. However, the high levels of progesterone during pregnancy interfere with the way your breasts respond to prolactin. This means that even if your prolactin levels are high, your breasts may not produce as much milk as they did before you were pregnant.
Changes in Mammary Tissue
During pregnancy, your breasts are also undergoing physical changes. They are preparing for "Lactogenesis I," which is the first stage of milk production for your new baby. This involves the remodeling of breast tissue. Sometimes, this internal construction work means that the current "factory" for your older child slows down to make room for the new system being built for the newborn.
Key Takeaway: Hormonal shifts—specifically rising progesterone—are the primary reason milk supply decreases during pregnancy. This process is generally independent of how often your child nurses.
When Does the Supply Drop Usually Happen?
While every person is different, most parents notice a decrease in supply during the first trimester or early in the second trimester. For some, the drop is sudden and noticeable within just a few weeks of conception. For others, it is a gradual decline that happens over several months.
By the middle of the second trimester, usually between weeks 16 and 22, the milk often transitions from mature milk back to colostrum. Colostrum is the thick, yellowish, nutrient-dense first milk produced for newborns. Because colostrum is produced in much smaller quantities than mature milk, the volume will naturally be lower during this stage of pregnancy.
Signs Your Supply is Decreasing
It can be difficult to measure exactly how much milk you are making, especially if you aren't pumping. However, there are several signs that your supply might be dropping while you are pregnant:
- Changes in your child's behavior: Your child may seem frustrated at the breast. They might pull at the nipple, fuss, or try to nurse more frequently to get more milk.
- Longer nursing sessions: If the flow is slower, your child may stay on the breast longer than usual.
- Changes in diaper output: If your nursing child is under a year old and relies on your milk as their primary source of nutrition, you may notice fewer wet diapers.
- Pumping output: If you pump, you will likely see the number of ounces in the bottle decrease over time.
- The "click" of swallowing: You may notice that you hear your child swallowing less frequently during a nursing session.
If your nursing child is older than one year, a drop in supply may not be as concerning, as they are likely getting most of their nutrition from solid foods. However, if your baby is under six months old and you are pregnant again, it is crucial to monitor their weight gain and diaper output closely.
What to Do if Your Supply Drops
If you notice a drop in supply and your goal is to continue breastfeeding, there are several steps you can take to manage the situation.
Monitor Your Child’s Growth
If your nursing child is under 12 months old, they still rely on milk or formula for the majority of their calories. If your supply drops significantly, they may need supplemental nutrition. Consult with your pediatrician to ensure they are staying on their growth curve. For babies under six months, you may need to supplement with donor milk or formula if your supply is no longer meeting their needs.
Focus on Your Own Nutrition
Your body is doing a lot of work right now. It is growing a human and producing milk at the same time. This requires a significant amount of energy. To support yourself, ensure you are eating enough calories and getting plenty of nutrients.
We often recommend focusing on nutrient-dense foods like:
- Oats and whole grains
- Healthy fats like avocado and nuts
- Lean proteins
- Leafy greens
Our Milky Mama Emergency Lactation Brownies are a delicious way to incorporate supportive ingredients like oats and flaxseed into your diet. While they may not override the hormonal shift of pregnancy, they provide much-needed energy and support for your overall well-being.
Stay Hydrated
Dehydration can make a low supply even worse. Pregnancy already increases your need for fluids, and breastfeeding adds to that. Aim to drink water throughout the day, and listen to your body’s thirst cues. If plain water feels boring, you can try hydrating beverages like Pumpin' Punch that support lactation.
Action Steps for Managing Supply:
- Track wet and dirty diapers if the child is under one year old.
- Offer solids more frequently if the child is over six months old.
- Schedule a weight check with your pediatrician.
- Increase your daily caloric intake by 300–500 calories to account for both pregnancy and breastfeeding.
- Drink at least 80–100 ounces of water daily.
Dealing with Nipple Sensitivity and Discomfort
One of the biggest challenges of breastfeeding during pregnancy isn't just the supply drop—it’s the physical discomfort. Pregnancy hormones often cause extreme nipple sensitivity. For many parents, nursing becomes painful or even skin-crawlingly uncomfortable. This is often referred to as "nursing aversion."
If you are experiencing pain, try the following:
- Check the latch: Sometimes a child’s latch can become "lazy" as they get older. Re-focusing on a deep, comfortable latch can help.
- Shorten nursing sessions: If long sessions are painful, try setting a timer or using a "nursing song" to signal when the session is over.
- Use nipple cream: Applying a soothing balm after nursing can help manage sensitivity.
- Distraction: If you feel "touched out" or agitated while nursing, try deep breathing or listening to a podcast to distract your mind.
The Transition to Colostrum
Around the midpoint of pregnancy, your milk will change. It moves away from the watery, white mature milk and becomes thicker and more yellow. This is colostrum.
Does the taste change?
Yes, the taste of your milk changes significantly during pregnancy. Colostrum is higher in sodium and lower in lactose (sugar) than mature milk. This means it tastes saltier and less sweet. Some children don't mind the change at all, while others may decide to wean themselves because they don't like the new flavor or the slower flow.
Is colostrum safe for an older child?
Absolutely. Colostrum is often called "liquid gold" because it is packed with antibodies and immune-boosting properties. It is perfectly safe and very healthy for an older toddler or baby to consume. In fact, it can provide a great immune boost for your older child while they are still nursing.
Can You Use Supplements to Increase Supply?
Many parents wonder if they can take lactation supplements to fight the pregnancy-related supply drop. While some herbal supports are safe, it is important to be cautious.
At Milky Mama, we offer several herbal lactation supplements, such as Lady Leche or Pumping Queen. However, we always recommend consulting with your healthcare provider or a certified lactation consultant before starting any new supplement while pregnant. Some herbs that are fine during regular lactation may not be recommended during pregnancy.
It is also important to have realistic expectations. Because the supply drop is caused by hormones rather than a lack of stimulation, supplements may have a limited effect. They can support the milk-making tissue you have, but they cannot stop the rising progesterone from doing its job.
Key Takeaway: While supplements and lactation treats can support your wellness, they may not fully restore your supply to pre-pregnancy levels due to the power of pregnancy hormones.
Safety and Breastfeeding During Pregnancy
A common myth is that breastfeeding while pregnant is unsafe or can cause a miscarriage. For the vast majority of healthy pregnancies, breastfeeding is completely safe.
Nursing does cause small releases of oxytocin, the hormone responsible for "let-downs" (when the milk begins to flow). Oxytocin is also the hormone that causes uterine contractions. However, in a normal, low-risk pregnancy, the uterus is not sensitive to these small amounts of oxytocin until very late in the pregnancy. Breastfeeding usually does not cause enough uterine activity to trigger preterm labor.
However, there are some situations where your doctor or midwife might recommend weaning:
- If you are carrying multiples (twins or triplets).
- If you have a history of preterm labor.
- If you are experiencing unexplained uterine pain or bleeding.
- If you are unable to gain enough weight due to the caloric demands.
If your pregnancy is considered high-risk, always follow the guidance of your medical team.
Deciding Between Tandem Nursing and Weaning
As your supply drops and your pregnancy progresses, you will eventually face a choice: do you want to keep nursing until the new baby arrives (tandem nursing), or is it time to wean?
Tandem Nursing
Tandem nursing is the practice of breastfeeding two (or more) children of different ages at the same time. This often happens after the new baby is born. Some parents find that tandem nursing helps the older sibling bond with the new baby and reduces sibling rivalry. If you want more detail, our guide to tandem nursing can help.
If you choose to tandem nurse, keep in mind that once the newborn arrives, they should always get the "first dibs" on the milk to ensure they get enough colostrum and calories for growth.
Weaning
Many children choose to wean themselves during pregnancy. The combination of a lower supply and a change in taste is often enough for a toddler to lose interest. If you decide to initiate weaning yourself, do so with compassion. You can slowly reduce the number of nursing sessions or "don't offer, don't refuse." If you want a gentle roadmap, our guide to weaning can help.
Remember, choosing to wean does not mean you are failing your child. You are simply transitioning to a new phase of your relationship. You can still provide plenty of cuddles and connection without the physical act of nursing.
Nutritional Requirements for Nursing While Pregnant
Your body is currently supporting three different people: you, your nursing child, and your developing baby. This is a massive physical undertaking! To stay healthy, you need to be very intentional about your intake.
- Protein: Protein is the building block for your new baby’s tissues and is essential for milk production. Focus on beans, lentils, eggs, meat, and Greek yogurt.
- Calcium: If you don't consume enough calcium, your body will take it from your own bones to give to the baby and the milk. Ensure you are getting enough through dairy, fortified plant milks, or leafy greens.
- Iron: Pregnancy often causes a drop in iron levels. Combined with breastfeeding, you may feel extra fatigued. Include iron-rich foods like spinach and lean red meat, and continue taking your prenatal vitamin.
- Healthy Fats: DHA and other healthy fats are vital for the baby's brain development and the quality of your breast milk.
Managing Fatigue
Fatigue is a hallmark of the first trimester, and it is even more intense when you are also chasing a toddler and breastfeeding. Be kind to yourself. Lower your expectations for housework and prioritize rest whenever possible.
If you are feeling overwhelmed, remember that "Every drop counts." Whether you nurse for five minutes or forty, you are providing comfort and nutrition. But your well-being matters too. If breastfeeding while pregnant is taking too much of a toll on your mental or physical health, it is okay to make a change.
Finding Support
Navigating a supply drop can feel lonely, but you don't have to do it alone. Connecting with a lactation professional can provide clarity. If you also want community support, join the Official Milky Mama Lactation Support Group on Facebook to connect with other moms who understand this exact season.
Fun fact: breastfeeding in public — covered or uncovered — is legal in all 50 states. This remains true whether you are nursing a newborn or a toddler while visibly pregnant. You have the right to feed your child wherever you are.
Summary of Key Points
- Hormones are the cause: Rising progesterone levels naturally suppress milk production during pregnancy.
- Timing varies: Most parents see a drop in the first or second trimester.
- The milk changes: Around mid-pregnancy, milk becomes colostrum, which is saltier and lower in volume.
- Safety: For most healthy pregnancies, breastfeeding is safe and will not cause preterm labor.
- Nutrition is vital: You need extra calories, hydration, and nutrients to support your body's "triple" workload.
- Behavioral changes: Be prepared for your child to either nurse more for comfort or potentially wean due to the taste and flow changes.
"Breastfeeding is a journey with many seasons. Pregnancy is simply a transition into a new season, and however you choose to navigate it is the right way for your family."
Conclusion
It is completely normal to feel a bit discouraged when you see your milk supply decreasing during pregnancy. It can feel like a loss of the "magic" that helped soothe your child. However, it is important to remember that breasts were literally created to feed human babies, and your body is doing exactly what it was designed to do—preparing for the arrival of a new life. If you want more structured education, our online breastfeeding classes are another helpful next step.
Whether you decide to continue on the path toward tandem nursing or use this as a natural opportunity to wean, you are doing an amazing job. At Milky Mama, we believe in empowering you with the tools and knowledge to make the best decisions for your health and your children. Take it one day at a time, listen to your body, and don't hesitate to reach out for support when you need it.
This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.
FAQ
Does every woman lose her milk supply during pregnancy?
While a vast majority of breastfeeding parents experience a significant decrease in milk volume, the degree of the drop varies. Some may see their supply disappear almost entirely by the second trimester, while others may maintain a small amount throughout the entire pregnancy. The change is primarily driven by hormones, so it is largely out of your control.
Will pumping more often help keep my supply up during pregnancy?
Unfortunately, increasing the frequency of pumping or nursing is usually not effective at maintaining supply during pregnancy. Because the drop is caused by high levels of progesterone inhibiting the milk-making process, the "supply and demand" rule is temporarily overruled by your body’s hormonal state. Most people find that their output remains low regardless of how much they stimulate the breasts.
Can my toddler still get enough nutrition if my supply is low?
If your toddler is over one year old, they should be getting most of their calories and nutrients from solid foods and water. In this case, your breast milk is a supplemental source of nutrition and comfort, so a drop in supply is usually not a medical concern. However, if your nursing child is under 12 months, you must work closely with a pediatrician to ensure they receive enough supplemental milk or formula.
Is it safe to take lactation supplements while pregnant?
Some lactation supplements are safe during pregnancy, while others may contain herbs that are not recommended. It is essential to check the ingredients and consult with your OB-GYN or midwife before starting any new herbal regimen. While supplements can support your body, they are unlikely to completely reverse the hormonal decrease in supply that naturally occurs during pregnancy.
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