Is Tuna Good While Breastfeeding? Safety, Benefits, and Tips

Posted on June 03, 2026

Introduction
The Nutritional Powerhouse of Tuna for Nursing Moms
Understanding the Mercury Concern
Choosing the Safest Type of Tuna
Safe Serving Guidelines for Nursing Parents
Does Tuna Increase Milk Supply?
Practical Tips for Adding Tuna to Your Diet
Beyond Tuna: Real Ways to Support Your Supply
Common Myths About Breastfeeding and Diet
Healthy Seafood Alternatives
Realistic Expectations for Your Journey
Conclusion
FAQ

Introduction

Standing in your kitchen and staring at a can of tuna is a common scenario for many nursing parents. You need a quick, high-protein snack that requires zero cooking time. After months of avoiding certain foods during pregnancy, you might wonder if those restrictions still apply now that you are nursing.

At Milky Mama, we believe that nourishing yourself should not feel like a math problem. We were founded by Krystal Duhaney, an RN, BSN, and IBCLC, to provide the support and education families need to reach their feeding goals. While tuna is a pantry staple for many, the answer to whether it is "good" depends on the species and how often you eat it.

This article will break down the nutritional benefits of tuna and explain the safety guidelines for mercury. We will also explore how your diet impacts your milk and share ways to support your supply. By the time you finish reading, you will feel confident choosing the best seafood for your family’s needs.

The Nutritional Powerhouse of Tuna for Nursing Moms

Tuna is often praised as a nutritional powerhouse because it is packed with essential vitamins and minerals. When you are breastfeeding, your body requires extra nutrients to maintain your own energy while producing milk. Tuna provides several of these key components in an easily accessible form. For more ideas about nourishing yourself while breastfeeding, explore this guide to eating for your breastfeeding journey.

High-Quality Protein for Recovery

Protein is a vital building block that supports your body’s recovery after birth. It also plays a major role in the metabolic process of producing breast milk. Tuna is a lean source of complete protein. This means it contains all the essential amino acids your body cannot produce on its own.

Including enough protein in your meals helps you feel fuller for longer. For an exhausted parent, staying satisfied between meals can prevent the "hangry" feeling that often comes with late-night nursing sessions.

Omega-3 Fatty Acids (DHA)

One of the most important nutrients found in tuna is Docosahexaenoic Acid, commonly known as DHA. This is a specific type of omega-3 fatty acid. DHA is critical for your baby’s brain development and the health of their eyes.

Interestingly, the amount of DHA in your breast milk is directly related to the amount of DHA in your diet. When you eat fish rich in these healthy fats, you are essentially "upgrading" the nutritional quality of your milk. Many lactation experts recommend moderate fish consumption for this reason.

Vitamin D and B12

Postpartum fatigue and "brain fog" are real challenges for many parents. Tuna is a natural source of Vitamin B12, which supports your nervous system and helps your body convert food into energy.

It also contains Vitamin D. This vitamin is essential for bone health and a strong immune system. Since many new parents spend a lot of time indoors with their newborns, getting Vitamin D from food is a smart way to meet your daily requirements.

Trace Minerals: Iodine and Selenium

These minerals are often overlooked, but they are very important for your thyroid. Your thyroid is a gland that regulates your hormones, including those involved in milk production. Your need for iodine increases significantly while you are breastfeeding. Including seafood like tuna in your routine helps you meet these needs naturally.

Key Takeaway: Tuna is rich in DHA, high-quality protein, and essential B vitamins that support both your postpartum recovery and your baby’s brain development.

Understanding the Mercury Concern

The primary reason parents worry about eating fish is the presence of mercury. Mercury is a heavy metal found naturally in the environment. It can also be released through industrial activities. Once it enters our oceans and rivers, it can be absorbed by fish.

How Mercury Accumulates

Mercury levels in fish are determined by a process called bioaccumulation. This is when a substance builds up in an organism faster than it can be removed. Smaller fish eat plankton that contains trace amounts of mercury. Larger, longer-lived fish then eat those smaller fish.

Because tuna are predatory fish that live for several years, they have more time to accumulate mercury in their muscle tissue. This is why some species of tuna have higher levels than smaller seafood like sardines or shrimp.

Why It Matters for Your Baby

When you consume mercury, a small amount can pass into your breast milk. A baby’s developing nervous system is much more sensitive to mercury than an adult's. However, it is important to keep this risk in perspective.

The amount of mercury that passes through breast milk is generally lower than the amount that crosses the placenta during pregnancy. Most health organizations agree that the benefits of DHA and protein outweigh the risks of low-level exposure. The key is simply choosing the right fish and monitoring your portions.

Choosing the Safest Type of Tuna

Not all tuna is the same. The mercury content varies widely depending on the species of fish. If you are shopping for groceries, here is how to identify the safest options.

Canned Light Tuna (The Best Choice)

Canned light tuna is usually made from Skipjack tuna. Skipjack are smaller fish that grow quickly and have shorter lifespans. Because they are younger when they are caught, they have less time to build up mercury. The FDA categorizes canned light tuna as a "Best Choice" for breastfeeding parents.

Albacore or White Tuna (The Moderate Choice)

Albacore is often labeled as "Solid White Tuna." These fish are larger than Skipjack and live longer. As a result, they can contain up to three times more mercury than light tuna. You can still enjoy Albacore, but you should limit your intake to stay within safe margins.

Yellowfin and Bigeye Tuna (Use Caution)

Yellowfin tuna is often found in fresh steaks or sushi. It contains moderate to high levels of mercury. Bigeye tuna contains some of the highest concentrations of mercury. It is generally best to avoid Bigeye tuna entirely while you are nursing.

Water-Packed vs. Oil-Packed

When choosing canned or pouched tuna, "in water" is often the better nutritional choice. When tuna is packed in oil, some of the beneficial omega-3 fatty acids can leach out into the oil. If you drain that oil away, you might lose some of those healthy fats. Tuna packed in water keeps the nutrients inside the fish.

Safe Serving Guidelines for Nursing Parents

To enjoy the benefits of tuna without unnecessary worry, it is helpful to follow the serving guidelines provided by the FDA and EPA. These recommendations are designed to maximize nutrition while keeping mercury exposure very low.

The 2–3 Serving Rule

For most nursing parents, the recommendation is to eat 8 to 12 ounces of low-mercury fish per week.

Canned Light Tuna: You can safely eat 2 to 3 servings per week.
Albacore (White) Tuna: Limit this to no more than 1 serving per week.

If you choose to have a serving of Albacore, try to avoid other fish for the rest of that week. This helps maintain a safe balance.

Measuring a Serving

A standard serving is about 4 ounces. This is roughly the size and thickness of the palm of your hand. If you use pouches or small cans, check the label. Most standard cans are around 5 ounces, so one can is slightly more than a single serving.

What if You Ate Too Much Tuna?

If you recently realized you have been eating more tuna than recommended, do not panic. Mercury levels build up over long periods of frequent consumption. An occasional extra serving is unlikely to cause immediate harm. Simply adjust your intake moving forward and focus on other protein sources for the next few weeks.

Does Tuna Increase Milk Supply?

Many parents search for specific "magic" foods that will cause a sudden increase in milk volume. In the world of lactation, we call these substances galactagogues. A galactagogue is a food, herb, or medication believed to support milk production.

Is Tuna a Galactagogue?

Technically, tuna is not a galactagogue. There is no clinical evidence that eating tuna directly signals your body to make more milk. However, there is a "big picture" benefit to consider. Milk production is a demanding process that requires calories and hydration.

Supporting the Foundation of Your Supply

While tuna may not directly boost your ounces, it supports the maternal health that makes milk production possible.

Satiety and Stress: Being hungry and depleted can increase stress. High stress can sometimes inhibit your let-down reflex. This is the process where milk flows from the ducts to the nipple. The protein in tuna helps keep you satisfied and nourished.
Energy Levels: The B vitamins and lean protein help you fight the exhaustion common in the postpartum period. When you have more energy, you are more likely to stay consistent with your nursing or pumping schedule.
Thyroid Support: As mentioned earlier, the iodine and selenium in tuna support a healthy thyroid. A well-functioning thyroid is critical for hormonal balance.

If your goal is to increase the amount of milk you are producing, it is often more effective to look at the "supply and demand" system. The more frequently and effectively you remove milk from the breast, the more milk your body will make. Learn more about power pumping and milk supply.

Practical Tips for Adding Tuna to Your Diet

As a busy parent, you need meals that are fast, easy, and do not require many dishes. Tuna is one of the most versatile staples in your pantry. Here are a few safe and simple ways to include it in your week.

Quick Recipe Ideas

The Classic Tuna Salad: Mix canned light tuna with a little avocado or Greek yogurt instead of heavy mayo. Add diced celery and a squeeze of lemon for flavor. Serve it on whole-grain crackers or a bed of greens.
Tuna Pasta: Toss flaked light tuna into whole-wheat pasta with olive oil, garlic, and frozen peas. This provides a balanced meal of protein, complex carbs, and healthy fats.
Tuna Melts: Use sprouted grain bread and a thin slice of cheese for a warm lunch that takes less than ten minutes.
Tuna and Quinoa Bowls: Mix tuna with cooked quinoa, cucumbers, and tomatoes for a nutrient-dense meal you can prep in advance.

Action Steps for Your Next Grocery Trip

Check the labels: Look for the words "Light" or "Skipjack" to ensure you are buying the lowest-mercury options.
Monitor your portions: Aim for two 4-ounce servings of light tuna per week.
Prioritize hydration: Always drink a large glass of water with your meal. Since milk is mostly water, staying hydrated is essential for your supply.

Beyond Tuna: Real Ways to Support Your Supply

While nutrition is a major piece of the puzzle, breastfeeding success often comes down to a combination of factors. If you feel like your supply needs an extra nudge, there are specific steps you can take alongside your healthy diet.

Focus on Milk Removal

The most powerful way to support your supply is to ensure frequent and effective milk removal. This may mean nursing your baby every 2 to 3 hours or adding a power pumping session to your day. Power pumping mimics a baby's cluster feeding and sends a strong signal to your body to ramp up production.

Incorporate Traditional Galactagogues

If you are looking for foods that have a reputation for supporting supply, look for ingredients like oats, brewer's yeast, and flaxseed. Our Emergency Lactation Brownies are one of our most-loved lactation treats. We specifically formulated them with these ingredients to help support your supply in a delicious, convenient way. They are perfect for a quick snack between meals.

Consider Herbal Support

For many moms, herbal supplements can provide targeted support. We offer several blends, such as Lady Leche™ or Pumping Queen™, through our lactation supplements collection. These are designed to work with your body's natural processes. These products are rooted in clinical lactation expertise and provide a way to nourish your supply from the inside out.

Hydration and Maternal Wellness

Don't forget that your well-being matters just as much as your baby's. If you struggle with drinking enough plain water, our Pumpin’ Punch™ is a great way to stay hydrated. It includes lactation-support ingredients and turns a necessary task into a refreshing treat. Explore our lactation drink mixes for options that can fit into your daily routine.

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

Common Myths About Breastfeeding and Diet

There is a lot of noise online about what you can and cannot eat while nursing. Let's clear up some of the most common myths to make your journey easier.

Myth: You must eat a "perfect" diet to produce good milk.

Fact: Your body is incredibly efficient. It will actually pull nutrients from your own stores to ensure your breast milk contains exactly what your baby needs. A healthy diet is more about protecting your own health and energy levels so you do not feel depleted.

Myth: Strong flavors like tuna or garlic will cause baby to reject the breast.

Fact: While flavors from your diet can pass into your milk, most babies actually enjoy the variety. In fact, exposure to different tastes through breast milk may make your baby more willing to try new foods when they transition to solids. If your baby seems unusually fussy after you eat a specific food, you can try a temporary elimination, but most babies tolerate a varied diet very well.

Myth: You must avoid all "gassy" foods like broccoli or spicy meals.

Fact: Gas is a localized reaction in your digestive tract. The gas itself does not pass into your breast milk. Unless your baby has a specific sensitivity or allergy, you can typically enjoy your favorite spicy or fibrous foods without worry.

Healthy Seafood Alternatives

If you are not a fan of tuna or want to vary your diet, there are many other seafood options that are safe and beneficial. Some of these have even higher levels of DHA and lower levels of mercury than tuna.

Salmon: This is one of the best sources of omega-3 fatty acids and is very low in mercury.
Sardines: These are small, nutrient-dense fish that are high in calcium and healthy fats.
Shrimp and Scallops: These are popular low-mercury options that provide plenty of protein.
Freshwater Trout: This is another excellent source of healthy fats.

By incorporating a variety of these fish, you can maximize the brain-building benefits for your baby. Just remember to avoid the "high mercury" fish like Shark, Swordfish, and King Mackerel.

Realistic Expectations for Your Journey

It is important to remember that every body is different. What works for one parent might not work for another. Some moms find that eating a tuna sandwich gives them the quick energy boost they need, while others might prefer to get their nutrients elsewhere. Results and experiences vary, so listen to your body and your baby.

If you find that your supply is still lower than you would like, try not to be too hard on yourself. Your well-being matters just as much as the milk you produce. Taking a moment to enjoy a nutritious snack or a supportive lactation treat can be a small but meaningful act of self-care. You are doing an amazing job, and we are here to support you every step of the way.

Conclusion

Tuna can absolutely be a healthy and safe part of your breastfeeding diet. By choosing "Light" or "Skipjack" varieties and sticking to 2 to 3 servings a week, you provide your baby with essential DHA while keeping your own energy levels high. While it is not a direct milk booster, it provides the nutritional foundation your body needs to sustain the hard work of nursing.

Choose Skipjack or Light tuna for the highest safety margin.
Prioritize DHA to support your baby’s cognitive growth.
Remember that frequent milk removal is the primary driver of milk volume.
Focus on nourishing yourself so you can feel your best.

"Every drop counts. Whether you are providing an ounce or a gallon, you are doing an incredible job for your baby. Focus on nourishing your own body, and your supply will follow."

If you are ready to give your supply an extra boost alongside your healthy meals, we are here to help. From our lactation snacks to our certified lactation support, our goal is to empower you at every stage of your journey. You are doing an amazing job, and you deserve to feel supported and well-fed as you care for your little one.

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

FAQ

Is it safe to eat tuna every day while breastfeeding?

It is generally not recommended to eat tuna every day because of the potential for mercury to build up in your system over time. The FDA suggests sticking to 2 to 3 servings of "light" tuna per week to keep mercury levels safe for your developing baby. Balancing your diet with other low-mercury proteins like salmon, chicken, or beans is a safer and more varied approach.

Which type of tuna has the least amount of mercury?

Skipjack tuna, which is almost always the species found in cans labeled "Light Tuna," has the lowest mercury levels among common tuna species. This is because Skipjack are smaller and have shorter lifespans, giving them less time to accumulate heavy metals. Avoid "Bigeye" tuna, as it is a large predator with much higher mercury concentrations.

Can the DHA in tuna really help my baby's brain?

Yes, DHA is a critical building block for your baby’s brain, nervous system, and eye development. Since the level of DHA in your breast milk is directly influenced by what you eat, consuming low-mercury fish is an effective way to pass this essential nutrient to your baby. This is one of the best ways to improve the nutritional quality of your milk through diet.

Does the mercury in tuna pass through breast milk?

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