Is Tuna Good to Eat While Breastfeeding?

Posted on June 03, 2026

Introduction
The Nutritional Benefits of Tuna for Lactation
Understanding the Mercury Concern
Choosing the Best Type of Tuna
How Much Tuna is Safe to Eat?
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
Conclusion
FAQ

Introduction

Deciding what to put on your plate can feel a bit like a puzzle when you are nursing. After months of pregnancy restrictions, you might be looking forward to adding more variety back into your diet. Tuna is a popular choice for many parents because it is convenient, affordable, and packed with protein. However, you may have heard conflicting advice about mercury levels and whether certain fish are safe for your little one.

At Milky Mama, we understand that you want to nourish your body while providing the very best for your baby. We were founded by Krystal Duhaney, a Registered Nurse and International Board Certified Lactation Consultant, to ensure families have access to the education they need to thrive. While many are eager to know if tuna can support their journey, the answer depends on the type of tuna you choose and how often you eat it.

This article will explore the nutritional benefits of tuna, the safety guidelines regarding mercury, and how to balance seafood in a healthy breastfeeding diet. We will also look at how your nutritional choices impact the quality of your milk and your overall well-being. Our goal is to help you feel empowered and informed so you can enjoy your meals with confidence.

The Nutritional Benefits of Tuna for Lactation

Tuna is often considered a nutritional powerhouse for postpartum recovery. When you are breastfeeding, your body requires extra calories and specific nutrients to maintain your energy and produce high-quality milk. Tuna provides several of these essential components in a way that is easy for the body to process.

High-Quality Protein

Protein is a vital building block for both you and your baby. During the postpartum period, your body uses protein to repair tissues and support the metabolic demands of milk production. Tuna is a lean source of complete protein, meaning it contains all the essential amino acids your body cannot make on its own. Including enough protein in your meals may help you feel fuller for longer, which is a major win for busy parents who often find themselves snacking throughout the day.

Omega-3 Fatty Acids (DHA)

One of the most important nutrients found in tuna is Docosahexaenoic Acid, commonly known as DHA. This is a type of omega-3 fatty acid that is critical for your baby’s brain and eye development. Interestingly, the level of DHA in your breast milk is directly related to the amount of DHA in your diet. When you eat fish rich in these fats, you are essentially "upgrading" the nutritional quality of your milk. This support for your baby’s cognitive growth is one of the primary reasons health experts encourage moderate fish consumption during lactation.

Vitamin D and B12

Many new parents struggle with fatigue and "brain fog." Tuna is a natural source of Vitamin B12, which is essential for energy metabolism and nervous system health. It also provides Vitamin D, which supports bone health and immune function. Since it can be difficult to get enough Vitamin D from sunlight alone—especially if you are spending most of your time indoors with a newborn—including it in your diet is a smart strategy.

Iodine and Selenium

These trace minerals are often overlooked but are very important for thyroid health. Your thyroid regulates your hormones, including those that support milk production. Since your requirements for iodine increase significantly while breastfeeding, adding seafood to your routine can help you meet these needs naturally.

Key Takeaway: Tuna is rich in DHA, protein, and essential vitamins that directly improve the nutritional quality of your breast milk and support your postpartum recovery.

Understanding the Mercury Concern

The main reason for caution when discussing fish is mercury. Mercury is a heavy metal that occurs naturally in the environment but can also be released through industrial activities. Once it enters our waterways, it can be absorbed by fish.

How Mercury Accumulates

Mercury levels in fish are determined by a process called bioaccumulation. Smaller fish eat plankton that contains trace amounts of mercury. Larger, longer-lived fish then eat those smaller fish. Over time, the mercury builds up in the muscle tissue of the larger fish. Because tuna are predatory fish, they tend to have higher levels of mercury than smaller seafood like sardines or shrimp.

Why It Matters for Your Baby

When a nursing parent consumes mercury, a small amount can pass into the breast milk. A baby’s developing nervous system is more sensitive to mercury than an adult’s. However, it is important to keep this in perspective. The amount of mercury that passes through breast milk is generally much lower than the amount that crosses the placenta during pregnancy. Most lactation experts agree that the benefits of DHA and protein usually outweigh the risks of low-level mercury exposure, as long as you follow safety guidelines.

Choosing the Best Type of Tuna

Not all tuna is the same. The species and the way it is caught can significantly impact the mercury content. If you are standing in the grocery aisle, here is what you need to look for to make the safest choice.

Canned Light Tuna (The Safest Choice)

Canned light tuna is usually made from Skipjack tuna. Skipjack are smaller, grow quickly, and have a shorter lifespan than other tuna species. Because they are younger and smaller, they have much less time to accumulate mercury in their tissues. For most breastfeeding families, canned light tuna is the best option for regular consumption.

Albacore or White Tuna (The Moderate Choice)

Albacore is often labeled as "Solid White Tuna." These fish are larger and live longer than the fish used for light tuna. Consequently, they can contain up to three times more mercury. While you do not have to avoid Albacore entirely, you should limit how often you eat it to stay within safe margins.

Yellowfin and Bigeye (The Avoid Category)

Yellowfin tuna is frequently found in sushi or sold as fresh steaks. It contains moderate to high levels of mercury. Bigeye tuna, which is often served in high-end restaurants, contains the highest mercury concentrations and should generally be avoided while you are breastfeeding.

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 into the oil. When you drain that oil away, you might be losing some of those healthy fats. Tuna packed in water keeps those nutrients where they belong—in the fish.

How Much Tuna is Safe to Eat?

To enjoy the benefits of tuna without the worry, it is helpful to follow the serving guidelines provided by the FDA and EPA. These recommendations are designed to help you get the nutrients you need while keeping mercury exposure low.

The 2–3 Serving Rule

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

Canned Light Tuna: You can safely enjoy 2 to 3 servings (about 4 ounces per serving) per week.
Albacore (White) Tuna: Limit this to no more than 1 serving (about 4 ounces) per week. If you eat Albacore, try to avoid other fish for the rest of that week.

Measuring a Serving

A standard serving is about 4 ounces, which is roughly the size and thickness of the palm of your hand. If you prefer the convenience of pouches or cans, most are around 2.5 to 5 ounces, making it easy to track your intake.

What if You Ate Too Much?

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 to stay within the recommended safety margins.

Does Tuna Increase Milk Supply?

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

Is Tuna a Galactagogue?

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

Supporting the Foundation of 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, which may inhibit your let-down reflex (the process where milk flows from the ducts). The protein in tuna helps keep you nourished and satisfied.
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 healthy thyroid function, which 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 you remove milk from the breast, the more milk your body will make. For additional guidance, explore this guide to increasing breast milk supply naturally.

Practical Tips for Adding Tuna to Your Diet

As a busy parent, you need meals that are fast, easy, and don't require much clean-up. Tuna is one of the most versatile pantry staples available. 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 and crunch. Serve it on whole-grain crackers or a bed of leafy 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 carbohydrates, and healthy fats.
Tuna Melts: Use sprouted grain bread and a slice of cheese for a warm, comforting lunch that takes less than ten minutes to prepare.
Tuna and Quinoa Bowls: Mix tuna with cooked quinoa, cucumbers, and tomatoes for a nutrient-dense meal you can prep in advance.

What to Do Next

Check your pantry: Look for labels that say "Light" or "Skipjack" to ensure you have 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.

For more ideas about nutrition during lactation, read this guide to eating while breastfeeding.

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 are feeling 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. This breastfeeding and pumping guide can help you build a consistent routine.

Incorporate Traditional Galactagogues

If you are looking for foods that do 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, specifically formulated with these ingredients to help support your supply in a delicious way. They provide a convenient snack that fits perfectly into a busy parent's schedule.

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, which are designed to work with your body's natural processes. These supplements 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 are struggling with plain water, our Pumpin’ Punch™ is a great way to stay hydrated while also getting a boost from lactation-support ingredients. Explore the lactation drink mixes collection for drink options that can fit into your routine. It turns a necessary task—drinking water—into a refreshing treat that supports your goals.

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 don't 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.

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 for brain development 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/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 collection 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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