Does Your Breast Milk Supply Decrease When Pregnant?
Posted on April 26, 2026
Table of Contents
- Introduction
- Why Milk Supply Changes During Pregnancy
- When Does the Decrease Usually Happen?
- Signs Your Milk Supply Is Changing
- The Shift from Mature Milk to Colostrum
- Common Challenges When Nursing While Pregnant
- Is It Safe to Breastfeed During Pregnancy?
- Managing Nutrition and Hydration for Two (Plus One)
- Strategies to Support Your Supply and Comfort
- Deciding Whether to Wean or Tandem Nurse
- Milky Mama Support for Your Journey
- FAQ
Introduction
Finding out you are pregnant while you are still breastfeeding can bring up a whirlwind of emotions. You might feel excitement for the new addition to your family. You may also feel a sense of worry about how this change will impact your current nursing relationship. Many parents wonder if they can continue to provide enough milk for their older child while their body focuses on growing a new baby. It is a common situation, and you are certainly not alone in navigating this transition.
At Milky Mama, we understand that breastfeeding while pregnant—often called "nursing through"—comes with a unique set of questions and challenges. Many moms notice changes in their milk volume or how their breasts feel very early in the first trimester. While every body responds differently to pregnancy, there are biological reasons why these changes occur. If you'd like a deeper look at the physiology, our guide to breastfeeding while pregnant breaks down these changes in more detail.
This article will explore the reasons why milk supply often drops during pregnancy. We will discuss when you might notice these changes and how the composition of your milk evolves. We will also cover safety considerations and practical ways to support your body during this time. If you want a more structured foundation, Breastfeeding 101 is another helpful next step.
Why Milk Supply Changes During Pregnancy
The primary reason milk supply decreases during pregnancy is due to a significant shift in your hormones. From the moment of conception, your body begins to prioritize the growth and development of the fetus. This requires a complex dance of various hormones that can directly interfere with the process of lactation (milk production).
In a typical breastfeeding journey, milk production is driven by a hormone called prolactin. Prolactin is the "milk-making" hormone. However, during pregnancy, your placenta produces high levels of estrogen and progesterone. While these hormones are essential for maintaining a healthy pregnancy, they also act as inhibitors to prolactin. High levels of progesterone essentially "block" the receptors in the breast tissue that respond to prolactin, making it much harder for your body to maintain a high volume of milk.
This is a physiological change that usually cannot be completely reversed by increased pumping or nursing. In a standard breastfeeding scenario, "demand" (nursing or pumping) creates "supply." During pregnancy, the hormonal environment often overrides this supply-and-demand rule. Even if you are nursing frequently, your body may still produce less milk because the internal hormonal signals are prioritizing the pregnancy.
Key Takeaway: Hormonal shifts—specifically rising progesterone—are the main cause of decreased milk supply during pregnancy. These hormones can override the usual supply-and-demand nature of breastfeeding.
When Does the Decrease Usually Happen?
Most mothers notice a decrease in their milk supply between the fourth and fifth months of pregnancy. However, for some, the drop can happen as early as the first trimester. For a practical next step, see what to do when milk supply drops while breastfeeding.
The timing often correlates with the end of the first trimester and the beginning of the second. This is the period when the placenta fully takes over hormone production. As the placenta grows and becomes more active, progesterone levels climb steadily. By mid-pregnancy, usually around week 16 to 20, many mothers find that their milk supply has diminished considerably.
It is important to remember that this timeline is not set in stone. Some moms maintain a decent supply until the very end, while others may see their milk "dry up" within the first few weeks of pregnancy. Your unique hormonal profile, your child’s nursing frequency, and your body’s sensitivity to pregnancy hormones all play a role in this timing.
What to do next:
- Track your child's wet diapers to ensure they are staying hydrated.
- Observe if your child is becoming frustrated at the breast.
- Start introducing other age-appropriate fluids or foods if your child is over six months old.
- Consult with a lactation professional if you have concerns about your child's growth.
Signs Your Milk Supply Is Changing
It isn't always a sudden stop in milk production. Most mothers notice gradual signs that their supply is dipping. If you are still nursing a baby who relies primarily on breast milk for nutrition, being aware of these signs is crucial.
One of the first things you might notice is a change in your child’s behavior at the breast. They may seem more frustrated during nursing sessions. You might notice them pulling on the nipple, fussing, or wanting to nurse much more frequently in an attempt to get more milk. Conversely, some children may lose interest in nursing altogether because the flow has slowed down.
If you pump, does pumping increase milk supply? can help you interpret what you see. You may see a steady decline in the number of ounces you collect during each session. You might also notice that your breasts no longer feel "full" or heavy, even after a long period between nursing sessions. This is normal, as the hormonal shift prevents the breasts from filling with the same volume of mature milk.
The Shift from Mature Milk to Colostrum
As your pregnancy progresses into the second and third trimesters, your milk doesn't just decrease in volume; it also changes in composition. Your body begins to prepare for the arrival of the new baby by producing colostrum. Colostrum is often called "liquid gold." It is the first milk produced after birth, and it is incredibly rich in antibodies, proteins, and fats designed for a newborn’s tiny stomach.
Around the middle of your pregnancy, your mature milk will begin to transition back into colostrum. This is a fascinating biological process. Your body is essentially resetting its milk production cycle to ensure the newborn has the specific nutrition they need immediately after birth.
Because colostrum is different from mature milk, your older child may notice a change in the taste. Colostrum is often described as being saltier and less sweet than mature milk. It also has a thicker consistency and is produced in much smaller quantities. Some toddlers may naturally decide to wean at this point because they do not like the new flavor or the slower flow. Others may continue to nurse happily, enjoying the comfort and the concentrated nutrients.
Common Challenges When Nursing While Pregnant
Nursing through pregnancy is possible, but it often comes with physical and emotional challenges. It is important to acknowledge these so you can prepare for them and decide what is right for you.
Nipple Sensitivity and Pain
One of the most common complaints is increased nipple sensitivity or even pain. This is caused by the surge of hormones during pregnancy. For many, this sensitivity feels similar to the tenderness experienced during a menstrual cycle, but it can be much more intense. If the pain feels tied to latch, the perfect latch guide may help you troubleshoot positioning.
Nursing Aversion or Agitation
Some mothers experience a phenomenon known as Breastfeeding Aversion and Agitation (BAA). This is a feeling of intense irritability, skin-crawling, or an overwhelming urge to unlatch the child during nursing. It is a physiological response that is often linked to the hormonal changes of pregnancy. If you experience this, know that it is a recognized condition and not a reflection of your love for your child.
Increased Fatigue
Breastfeeding already requires a significant amount of energy. When you add the metabolic demands of pregnancy, it is completely normal to feel exhausted. Your body is working overtime to grow a human and produce milk simultaneously. Taking care of your own well-being is vital during this stage.
Is It Safe to Breastfeed During Pregnancy?
For the vast majority of healthy pregnancies, breastfeeding while pregnant is considered safe. A common concern is that the oxytocin released during breastfeeding could cause uterine contractions and lead to preterm labor. Oxytocin is the hormone responsible for the "let-down" reflex (the release of milk), and it also causes the uterus to contract.
However, in a low-risk pregnancy, the uterus is generally not sensitive to these small amounts of oxytocin until very late in the third trimester. The number of oxytocin receptors in the uterus is quite low during the early and middle stages of pregnancy. Most healthcare providers agree that breastfeeding is not a risk factor for miscarriage or preterm birth in a healthy pregnancy.
If you want personalized guidance, our virtual lactation consultations can help you talk through your history with a professional.
That said, there are certain situations where your doctor or midwife might recommend weaning. This includes:
- A history of preterm labor or premature birth.
- Carrying multiples (twins or more).
- Experiencing unexplained uterine pain or bleeding.
- A diagnosis of an incompetent cervix.
Always discuss your specific health history with your healthcare provider to ensure that continuing to nurse is the right choice for your pregnancy.
Managing Nutrition and Hydration for Two (Plus One)
When you are pregnant and breastfeeding, your nutritional needs are at their peak. You are essentially eating for three: yourself, your growing fetus, and your nursing child. This requires a focus on nutrient-dense foods and adequate calorie intake.
On average, a breastfeeding mother needs about 500 extra calories per day to maintain milk supply. A pregnant mother needs about 300 to 500 extra calories depending on the trimester. When doing both, you may need to increase your intake significantly. Focus on high-quality proteins, healthy fats, and complex carbohydrates.
Hydration is also critical. Dehydration can exacerbate the pregnancy-related dip in milk supply and leave you feeling depleted. We often suggest keeping a water bottle with you at all times. If plain water feels boring, our Pumpin' Punch™ drink mix or Milky Melon™ lactation drinks are excellent options.
Key Takeaway: You need extra calories and plenty of fluids to support both pregnancy and lactation. Listen to your body’s hunger and thirst cues closely.
Strategies to Support Your Supply and Comfort
While you may not be able to completely stop the hormonal dip in supply, there are ways to support your body and make the experience more comfortable.
Use Positioning to Protect Your Nipples
If nipple sensitivity is an issue, pay close attention to your child's latch. Even an older child can develop a "lazy" latch that causes pain. Encourage them to open wide and bring them in close. You might also find that different positions, like side-lying, take the pressure off sensitive areas.
Gentle Breast Care
Avoid using harsh soaps on your nipples, which can cause dryness and further irritation. You can apply a small amount of expressed milk or a nipple balm after nursing to soothe the tissue.
Consider Herbal Support
Some mothers find that gentle herbal supplements can help support their remaining supply. Products like our Lady Leche™ supplement or Pumping Queen™ are formulated to support lactation. However, it is important to have realistic expectations. While these herbs can support your body, they are often competing with powerful pregnancy hormones.
Prioritize Rest
This cannot be overstated. Your body is doing an incredible amount of work. Aim for early bedtimes and take naps when your child naps whenever possible. Stress and exhaustion can further impact milk supply, so giving yourself grace is essential.
Action Steps for Support:
- Increase your daily water intake.
- Add an extra nutrient-dense snack to your day.
- Check your older child’s latch for any needed adjustments.
- Speak with your healthcare provider before starting any new herbal supplements.
- Browse our lactation supplements collection before starting any new herbal support.
Deciding Whether to Wean or Tandem Nurse
As your supply changes, you will face a decision: should you wean your older child or prepare for tandem nursing? Tandem nursing is the practice of breastfeeding two children of different ages at the same time.
There is no "right" answer here. The best choice is the one that works for your mental health and your family's needs. If nursing has become painful or causes you significant distress due to nursing aversion, weaning may be the best path forward. If you and your older child still enjoy the connection and you are physically comfortable, you can continue to nurse throughout your pregnancy.
If you want to read more about the transition, our tandem breastfeeding guide walks through what tandem nursing means. If you choose to continue, you will eventually transition to nursing both the newborn and the toddler. Many mothers find that tandem nursing helps the older sibling adjust to the new baby and reduces feelings of jealousy. After birth, your body will prioritize the newborn's needs, and your supply will increase again (often quite dramatically) to accommodate both children.
Milky Mama Support for Your Journey
At Milky Mama, we believe that every drop counts and every mother’s journey is unique. If you are primarily pumping, Pumping Queen™ supplement is another option many moms review with their provider. Whether you choose to wean during pregnancy or continue on to tandem nurse, we are here to support you. We were founded by Krystal Duhaney, a Registered Nurse and International Board Certified Lactation Consultant (IBCLC), to ensure that families have access to the education and products they need.
If you are struggling with the transition, our Emergency Lactation Brownies are a favorite among many of our moms. They are a delicious way to incorporate supportive ingredients like oats and flaxseed into your diet. We also offer virtual lactation consultations if you need one-on-one professional guidance to navigate nursing during pregnancy.
Remember, you are doing an amazing job. Growing a baby while nourishing another is a massive feat of strength and love. Be kind to yourself as your body goes through these changes.
This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.
FAQ
Does milk supply always decrease during pregnancy?
For the majority of women, milk supply does decrease significantly during pregnancy due to rising levels of progesterone. While a small percentage of mothers may not notice a major change, research suggests that about 70% of breastfeeding parents experience a drop in volume. This typically happens between the fourth and fifth months of pregnancy.
Can I do anything to keep my milk supply from dropping while pregnant?
Because the decrease is caused by pregnancy hormones, it is often difficult to prevent it entirely through traditional methods like power pumping. However, staying well-hydrated, maintaining a high-calorie diet, and using supportive lactation treats from our lactation snacks collection may help maintain what supply your body is capable of producing. It is important to have realistic expectations, as your body is biologically programmed to prioritize the new pregnancy.
Will the taste of my breast milk change when I am pregnant?
Yes, the taste of your milk usually changes during the second trimester as it transitions from mature milk back into colostrum. Milky Melon™ drink mix can be a refreshing option while you navigate that shift. Some toddlers may notice this change and choose to wean on their own because of the different flavor.
Is it safe to continue breastfeeding if I am having a high-risk pregnancy?
If you have a high-risk pregnancy, you should consult with your doctor or midwife specifically about breastfeeding. In cases of a history of preterm labor, cervical issues, or carrying multiples, your healthcare provider may recommend weaning to avoid the release of oxytocin. Always follow the medical advice of your provider to ensure the safety of your pregnancy.
Final Thought: While a decrease in milk supply during pregnancy is a normal biological response to changing hormones, it doesn't have to mean the end of your breastfeeding journey if you aren't ready. Focus on your nutrition, listen to your body, and seek support when you need it. You're doing an amazing job providing for your family.
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