Does Pregnancy Decrease Breast Milk Supply?

Posted on April 24, 2026

Introduction
Why Your Milk Supply Changes During Pregnancy
When Does the Decrease Usually Happen?
Common Challenges While Nursing During Pregnancy
Supporting Your Body and Your Supply
The Impact on the Nursing Child
Is Breastfeeding During Pregnancy Safe?
What is Tandem Nursing?
Managing Your Mental Health
Practical Tips for the Transition
Conclusion
FAQ

Introduction

Finding out you are pregnant while you are still nursing can bring up a whirlwind of emotions. You might feel a mix of excitement for the new addition and a bit of worry about your current breastfeeding journey. One of the most common questions we hear at Milky Mama is whether pregnancy will cause a dip in milk production. It is a valid concern because your body is now performing the incredible feat of growing a human while also nourishing another.

The short answer is that for most people, pregnancy does lead to a decrease in milk supply. This change is primarily driven by the powerful hormones required to support a developing pregnancy. While a drop in supply can be challenging, it does not necessarily mean your breastfeeding relationship has to end. Understanding why these changes happen can help you make the best decisions for your family. This post covers the hormonal shifts, the timeline of supply changes, and how you can support your body during this transition. For additional guidance, explore this guide to supporting your milk supply while pregnant.

Why Your Milk Supply Changes During Pregnancy

Milk production is a complex process controlled by hormones and the physical removal of milk. When you are not pregnant, the hormone prolactin is the main driver of milk production. Prolactin tells your breasts to make milk whenever your baby nurses or you pump. However, once a new pregnancy begins, your body undergoes a massive hormonal shift to protect the growing fetus.

The placenta produces high levels of estrogen and progesterone. These hormones are essential for maintaining the pregnancy. Unfortunately, progesterone acts like a "brake" on the milk-making cells in your breasts. Even though your prolactin levels remain high, the progesterone prevents the breasts from responding to it as effectively. This is why you might notice a drop in supply even if your nursing child is still feeding frequently.

The Role of Progesterone

Progesterone is often called the "pregnancy hormone" because it prepares the uterus for implantation and supports the early stages of gestation. While it is vital for the baby in your womb, it suppresses the secretion of milk. This is the same reason why your milk doesn't fully "come in" until a few days after birth—because the progesterone levels only drop once the placenta is delivered. During pregnancy, those levels stay high, naturally limiting how much milk your body can produce.

The Shift to Colostrum

As your pregnancy progresses, your milk will eventually transition back into colostrum. Colostrum is the thick, yellowish "liquid gold" that is rich in antibodies and concentrated nutrients. This usually happens around the second trimester, specifically between weeks 16 and 20. This transition is a biological preparation for the new baby. While colostrum is incredibly healthy, it is produced in much smaller volumes than mature milk. This shift in volume and consistency is a major reason why many nursing children notice a difference.

When Does the Decrease Usually Happen?

Most nursing parents begin to notice a change in their supply toward the end of the first trimester or the beginning of the second trimester. Every body is different, so the exact timing can vary. Some may see a drop as early as six weeks, while others might maintain a steady supply until mid-pregnancy.

Usually, the decrease is gradual. You might notice your child spending more time at the breast to get the same amount of milk. If you are pumping, you may see fewer ounces in the collection bottle. By the middle of the second trimester, the supply often reaches its lowest point. This is also when the flavor of the milk changes due to the increase in sodium and protein and the decrease in lactose (milk sugar).

Key Takeaway: Pregnancy-related supply drops are physiological and hormonal. They are usually not related to your diet or how often you nurse, but rather to the hormonal environment of your body.

Common Challenges While Nursing During Pregnancy

A decrease in supply is not the only thing you might experience. Pregnancy brings about several physical and emotional changes that can impact your breastfeeding experience. Being aware of these can help you prepare and find ways to stay comfortable.

Nipple Sensitivity and Soreness

One of the earliest signs of pregnancy is often tender or sore nipples. For a breastfeeding parent, this can make nursing feel uncomfortable or even painful. This sensitivity is caused by the increase in estrogen and progesterone. If nursing becomes painful, you might try adjusting your child's latch or using different positions to take the pressure off the most sensitive areas. Personalized help with latch, sore nipples, and other challenges is available through Milky Mama’s lactation consultations.

Nursing Aversion

Some parents experience what is known as "nursing aversion" or "breastfeeding agitation" during pregnancy. This is a sudden, intense feeling of irritation or a desire to unlatch the child while they are nursing. It is a common phenomenon and is often linked to hormones and fatigue. If you experience this, know that you are not alone. Taking deep breaths, staying hydrated, and setting gentle boundaries with your nursing child can help manage these feelings.

Increased Fatigue

Your body is working overtime. Growing a baby requires a significant amount of energy, and so does making milk. It is completely normal to feel more exhausted than usual. This fatigue can sometimes make it feel like your supply is lower than it actually is. Prioritizing rest and asking for help with household tasks can go a long way in supporting your overall well-being.

Supporting Your Body and Your Supply

While you cannot "override" the hormonal shifts of pregnancy, you can support your body so that it functions at its best. Taking care of your nutritional and emotional needs is the most important thing you can do for yourself and your children.

Prioritize Nutrition and Hydration

When you are breastfeeding while pregnant, your nutritional needs are at an all-time high. You are essentially "eating for three." It is important to consume enough calories to support the pregnancy, the nursing child, and your own energy levels. Focus on nutrient-dense foods like lean proteins, healthy fats, and complex carbohydrates. For more ideas, read this guide to nourishing your breastfeeding journey.

Hydration is equally important. Dehydration can exacerbate the feeling of low supply. Aim to drink water throughout the day, and consider electrolyte-rich options if you find it hard to stay hydrated. Our Pumpin’ Punch™ lactation drink mix is a refreshing way to make sure you are getting the fluids you need.

Consider Gentle Lactation Support

If you want to support the supply you do have, some herbal supplements may be helpful. However, it is vital to choose products that are safe for pregnancy. Many traditional lactation herbs are not recommended during pregnancy, so you should always consult with your healthcare provider or a certified lactation consultant before starting anything new.

Our Lady Leche™ supplement is a popular choice for many moms. We always recommend talking to your doctor to ensure any supplement fits into your specific pregnancy care plan.

What to do next:

Increase your daily water intake by at least 16–32 ounces.
Incorporate an extra 300–500 healthy calories into your diet.
Monitor your child's wet diapers to ensure they are getting enough fluids.
Talk to your OB-GYN or midwife about your plans to continue breastfeeding.

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

The Impact on the Nursing Child

How your child reacts to a decrease in milk supply depends largely on their age and how much they rely on your milk for nutrition.

Infants Under One Year

If your nursing child is under 12 months old, breast milk or formula should still be their primary source of nutrition. If your supply drops significantly due to pregnancy, you must work closely with a pediatrician or an IBCLC (International Board Certified Lactation Consultant). You may need to supplement with expressed milk or formula to ensure your baby is gaining weight and staying hydrated. Watch for signs like fewer wet diapers or increased fussiness after feedings.

Toddlers and Older Children

For toddlers who are already eating a variety of solid foods, a drop in milk supply is usually not a nutritional emergency. Many toddlers continue to nurse for comfort, even when the volume of milk is very low. This is often called "dry nursing." Some children may naturally lose interest and wean themselves because of the change in taste or the slower flow. Others may be perfectly happy to keep nursing right through the pregnancy.

Is Breastfeeding During Pregnancy Safe?

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. While nipple stimulation can cause mild uterine contractions (due to the release of oxytocin), these are usually not strong enough to trigger labor in a healthy pregnancy.

Your body is designed to prioritize the pregnancy. In most cases, the developing baby will get the nutrients they need first. However, there are some situations where a healthcare provider might suggest weaning. These include:

A history of preterm labor or premature birth.
Carrying multiples (twins or more).
Experiencing unexplained vaginal bleeding or uterine pain.
If you are having difficulty gaining enough weight during pregnancy.

Always keep an open line of communication with your healthcare provider to ensure you are making the safest choice for your situation.

What is Tandem Nursing?

If you continue to breastfeed throughout your pregnancy, you may end up "tandem nursing." This means breastfeeding both your newborn and your older child after the birth. Tandem nursing can be a beautiful way to help an older sibling adjust to a new baby. It can also help manage the initial oversupply that many parents experience when their milk "comes in" after delivery. Learn more in this guide to tandem breastfeeding.

When tandem nursing, the newborn's needs should always come first. Colostrum is essential for the newborn's immune system and digestion. Because your older child is likely eating solids, make sure the baby gets the first opportunity to nurse so they receive that vital colostrum.

Managing Your Mental Health

The pressure of growing a baby while nursing another can be overwhelming. It is okay to feel tired. It is okay to have mixed feelings about your supply dropping. At Milky Mama, we want you to know that you are doing an amazing job. Every drop of milk you have provided to your child is a gift, and your value as a mother is not defined by the number of ounces you produce.

If you find that breastfeeding during pregnancy is causing you significant stress or physical pain, it is okay to reconsider your plan. Whether you continue to nurse, decide to gently wean, or move toward tandem nursing, the best choice is the one that keeps you and your babies healthy and happy. Connecting with The Official Milky Mama Lactation Support Group on Facebook can also help you feel less alone.

Practical Tips for the Transition

As your supply changes, you might need to adjust your routine. Here are a few ways to make the transition easier for everyone involved:

Offer extra solids and fluids: If your child is over six months, make sure they have plenty of water and nutrient-dense snacks available throughout the day.
Use a nursing pillow: As your belly grows, a supportive pillow can help you find a comfortable position that doesn't put pressure on your stomach.
Keep nursing sessions short: If nipple sensitivity is an issue, try shorter but more frequent sessions rather than long ones.
Focus on connection: If you are "dry nursing," remember that your child is still getting the benefit of closeness and comfort from you.

Our Emergency Lactation Brownies are a favorite for moms who want a quick, delicious snack while juggling the demands of a busy household. They are made with ingredients like oats and flaxseed, which can be part of a healthy diet for any nursing parent. Keeping these on hand can give you a little boost when you are feeling the "pregnancy tireds."

Conclusion

Pregnancy almost always causes a decrease in breast milk supply due to the high levels of progesterone. While this change is natural and expected, it can be a significant adjustment for both you and your nursing child. By focusing on your nutrition, staying hydrated with options like Milky Melon™, and listening to your body's cues, you can navigate this journey with confidence. You can explore more options in the lactation drink mixes collection. Remember that your breastfeeding relationship is about more than just the milk—it is about the bond you share.

Hormones like progesterone naturally suppress milk production during pregnancy.
Supply typically drops during the late first or early second trimester.
Milk transitions back to colostrum around the middle of pregnancy.
Breastfeeding during pregnancy is safe for most low-risk pregnancies.

You are doing the work of two people right now, and that is nothing short of heroic. Whatever path you choose—whether it is tandem nursing or a gentle end to your breastfeeding journey—we are here to support you every step of the way.

FAQ

Will my milk supply come back during the pregnancy?

Generally, no. Your milk supply will likely remain low for the duration of the pregnancy because the hormones supporting the pregnancy stay elevated. However, once you give birth and the placenta is delivered, your progesterone levels will drop, and your milk will "come in" again for both your newborn and your older child.

Is the change in milk taste why my toddler is nursing less?

Yes, it is very common. Around the second trimester, the milk becomes higher in sodium and lower in sugar as it transitions to colostrum. This saltier taste, combined with a slower flow, leads many toddlers to naturally wean themselves during their mother's pregnancy.

Can I take lactation supplements while pregnant?

You must be very careful with supplements during pregnancy, as some herbs can cause uterine contractions. Always check with your healthcare provider before starting a product like Lady Leche™ or any other lactation supplement to ensure it is safe for your specific pregnancy.

How can I tell if my nursing infant is getting enough milk?

Subscribe & Save: 10% off

SHOP NOW

Your cart is empty

Your cart

Estimated total

About Milky Mama

Support

Stay Connected

Does Pregnancy Decrease Breast Milk Supply?

Table of Contents

Introduction