Is Tuna Good While Breastfeeding? Safety, Benefits, and Tips
Posted on June 03, 2026
Table of Contents
- Introduction
- The Nutritional Benefits of Tuna for Breastfeeding Moms
- Understanding the Mercury Question
- Which Tuna is Best? A Guide to Types and Varieties
- Does Tuna Increase Milk Supply?
- Practical Tips for Adding Tuna to Your Diet
- Beyond Tuna: Other Great Fish Choices
- Frequently Asked Questions About Tuna and Breastfeeding
- Conclusion
Introduction
If you have ever found yourself staring into your pantry at 3:00 AM while a tiny human snoozes in your arms, you know the specific kind of hunger that comes with breastfeeding. You need something fast, filling, and nutritious. For many of us, a can of tuna is the ultimate pantry hero. It is easy to whip into a sandwich, toss over a salad, or eat straight from the pouch. But as you look at that label, you might wonder: is tuna good while breastfeeding, or could the mercury levels be a concern for your little one?
At Milky Mama, we know that every bite you take feels more significant when you are nourishing another person. You want to make sure your diet supports your energy levels and your baby’s growth without any hidden risks. The good news is that you do not have to cross tuna off your grocery list entirely. When you choose the right types and stay within recommended amounts, tuna can be an excellent addition to your postpartum diet.
In this guide, we will break down exactly which types of tuna are safest, how much you should eat, and how this protein-packed fish can support your lactation journey. Our goal is to help you feel confident in your food choices so you can focus on what really matters—bonding with your baby. We believe that a well-nourished mom is an empowered mom, and understanding the role of seafood in your diet is a great place to start.
The Nutritional Benefits of Tuna for Breastfeeding Moms
When we talk about the "best" foods for breastfeeding, we are usually looking for things that provide a high nutritional return on investment. Tuna is a heavy hitter in this category. It is packed with nutrients that are often depleted during the postpartum period and are essential for your baby’s development.
High-Quality Protein for Recovery
Breastfeeding is a physically demanding job. Your body requires an extra 500 calories or more per day to maintain your milk supply. A large portion of those calories should come from high-quality protein. Protein is the building block of every cell in your body and your baby’s body. It helps repair tissues after birth and keeps you feeling full longer, which is essential when you are too busy to eat regular meals. Tuna is incredibly protein-dense, providing roughly 20 to 25 grams of protein per 3-ounce serving.
The Power of Omega-3 Fatty Acids (DHA and EPA)
You have likely heard that "fish is brain food," and that is largely due to omega-3 fatty acids like DHA (docosahexaenoic acid). DHA is a major structural component of the human brain and retina. During the first year of life, your baby’s brain grows at a staggering rate. Since babies cannot produce much DHA on their own, they rely on what they receive through your breast milk.
When you eat tuna, the DHA levels in your milk increase. This supports your baby’s cognitive development and visual acuity. For you, omega-3s may also help support heart health and reduce inflammation, which can be beneficial as your body heals from pregnancy and childbirth.
Vitamin D and B12
Many new mothers struggle with fatigue and "brain fog." While some of this is due to lack of sleep, nutritional deficiencies can play a role too. Tuna is one of the few natural food sources of Vitamin D. This vitamin is crucial for bone health and immune function. It also plays a role in mood regulation, which is vital during the postpartum period.
Tuna is also rich in Vitamin B12, which is necessary for DNA synthesis and keeping your nerve and blood cells healthy. A deficiency in B12 can lead to anemia and exhaustion—the last things a busy mom needs.
Iodine and Selenium
These trace minerals are often overlooked but are very important for thyroid health. Your thyroid regulates your metabolism and can influence your energy levels. Iodine is also passed through breast milk to support your baby’s growing brain and thyroid function. Including seafood like tuna in your weekly rotation is one of the easiest ways to meet your increased iodine needs during lactation.
Understanding the Mercury Question
While the nutrients in tuna are impressive, we have to talk about mercury. This is the main reason moms hesitate to eat fish while nursing. Mercury is a naturally occurring element, but it is also released into the environment through industrial processes. It settles in the water, where it is converted into methylmercury by bacteria.
What is Bioaccumulation?
Small fish eat plants and tiny organisms containing mercury. Larger fish then eat the smaller fish. Because tuna are predatory fish that live a long time, they accumulate more mercury in their tissues over their lifespan. This process is called bioaccumulation.
High levels of mercury can potentially affect a baby’s developing nervous system and brain. However, it is important to keep this in perspective. The amount of mercury that passes into breast milk is much lower than the amount that passes through the placenta during pregnancy. While you should still be mindful, you have a bit more flexibility now than you did when you were pregnant.
Why the Benefits Often Outweigh the Risks
Most experts agree that the benefits of the DHA and protein found in fish far outweigh the potential risks of low-level mercury exposure, provided you choose "low-mercury" options. The key is to be a savvy shopper and understand the different types of tuna available.
Key Takeaway: You do not need to fear tuna, but you should be intentional about the type of tuna you put in your cart. Choosing smaller tuna species allows you to get all the brain-boosting benefits with minimal mercury exposure.
Which Tuna is Best? A Guide to Types and Varieties
Walking down the tuna aisle can be confusing. Between "chunk light," "solid white," and "yellowfin," it is hard to know which one is the safest choice for your family. Here is a breakdown of the most common varieties.
Canned Light Tuna (The Best Choice)
If you are looking for the safest "everyday" tuna, canned light tuna is your best bet. This is usually made from Skipjack tuna, which is a smaller species. Because Skipjack tuna do not live as long and are lower on the food chain, they do not accumulate as much mercury.
- Safety Level: Low mercury.
- Recommendation: You can safely eat 2 to 3 servings (about 8 to 12 ounces) of light tuna per week.
Albacore or "White" Tuna (The Middle Ground)
Albacore tuna is larger and has a firmer texture and milder flavor. Because it is a larger fish, it contains significantly more mercury than Skipjack.
- Safety Level: Moderate mercury.
- Recommendation: Limit your intake to no more than 6 ounces (one serving) per week. If you eat Albacore, you should avoid other high-mercury fish for the rest of the week.
Yellowfin Tuna
Often found in steaks or high-end canned options, Yellowfin is similar to Albacore in terms of mercury content.
- Safety Level: Moderate mercury.
- Recommendation: Treat this like Albacore and limit it to one serving per week.
Bigeye Tuna (Avoid)
Bigeye tuna is often used in sushi (sashimi). It is one of the highest-mercury fish in the ocean.
- Safety Level: High mercury.
- Recommendation: It is generally recommended to avoid Bigeye tuna entirely while breastfeeding to minimize any risk to your infant.
Canned in Water vs. Canned in Oil
When choosing tuna, look at what it is packed in. We usually recommend tuna in water. Why? Omega-3 fats are "fat-soluble." When tuna is packed in oil, some of those beneficial DHA and EPA fats migrate into the packing oil. If you drain the oil, you are draining away some of the nutrients. When tuna is packed in water, the fats stay in the fish.
Does Tuna Increase Milk Supply?
This is a question we hear a lot at Milky Mama. Every mom wants to know if there is a "magic food" that will help her produce more milk. While tuna is not a direct galactagogue—a substance that specifically increases milk production—it supports your supply in an indirect but vital way.
The Demand-and-Supply Connection
Milk production is primarily driven by "demand and supply." The more often and effectively milk is removed from the breast (through nursing or pumping), the more milk your body will make. No food can replace the need for frequent milk removal.
However, your body is a factory. To run a factory efficiently, you need raw materials and energy. If you are surviving on crackers and coffee, your body may prioritize your own survival over milk production. This is where tuna comes in. By providing high-quality protein and essential fats, tuna gives your body the "fuel" it needs to keep the "milk factory" running smoothly.
Hydration and Mineral Support
Tuna contains a fair amount of sodium and potassium, which are electrolytes. While you should not overdo the salt, having a balance of electrolytes helps your body stay hydrated. Good hydration is essential for maintaining the fluid volume needed for milk production.
When You Need an Extra Boost
If you have optimized your diet and are nursing or pumping frequently but still feel your supply needs a lift, you might consider adding lactation-specific support to your routine. We offer a variety of options designed to complement a healthy diet.
- Lactation Treats: Our Emergency Lactation Brownies are a favorite for a reason. They are packed with ingredients like oats and flaxseed that many moms find helpful for supply.
- Herbal Supplements: If you want targeted support, products like Pump Hero or Pumping Queen can be very effective. These blends are formulated by our team of experts to support the hormones involved in lactation.
- Hydration Support: If water is getting boring, our Pumpin' Punch™ drink mix or lactation drink mixes provide hydration along with lactation-supporting ingredients.
This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.
Practical Tips for Adding Tuna to Your Diet
As a new parent, you probably do not have time for elaborate recipes. Here are some quick, "real-life" ways to get your 2 to 3 servings of low-mercury fish each week.
- The 5-Minute Tuna Salad: Mix a can of light tuna with a little Greek yogurt (for extra protein), some lemon juice, and chopped celery. Eat it with whole-grain crackers or inside a lettuce wrap.
- Tuna Pasta Toss: While your pasta is boiling, toss some frozen peas into the water. Drain, then mix in a can of tuna, a splash of olive oil, and some garlic powder. It is a complete meal in under 10 minutes.
- Tuna and Avocado Boats: Scoop out the center of an avocado and fill it with tuna mixed with lime juice and cilantro. The healthy fats from the avocado combined with the protein from the tuna make this a powerhouse snack.
- Tuna Pouch on the Go: Keep tuna pouches in your diaper bag or pump bag. They do not require draining and are an easy way to get protein when you are out and about.
What to Look for on the Label
When you are at the store, look for these keywords to ensure you are getting the best quality for your breastfeeding journey:
- "Chunk Light": Usually indicates lower-mercury Skipjack.
- "Wild Caught": Often a more sustainable choice with a great nutrient profile.
- "Pole and Line Caught": This means the fish were caught individually, which is better for the environment and often results in higher-quality fish.
Beyond Tuna: Other Great Fish Choices
If you want to vary your seafood intake, there are plenty of other "Best Choice" options that are very low in mercury and high in nutrients. Mixing things up is actually better for you and your baby because it exposes you to a wider variety of minerals.
- Salmon: This is the gold standard for breastfeeding moms. It is extremely high in DHA and very low in mercury.
- Sardines: These are nutritional powerhouses. They are small (low mercury) and can be eaten with the bones, providing a great source of calcium.
- Shrimp and Scallops: These are lean sources of protein that are very safe for nursing moms.
- Catfish and Tilapia: These are mild, affordable options that are generally very low in mercury.
Fish to Avoid Entirely
To keep things simple, just remember to avoid these "Big Seven" fish that are notoriously high in mercury:
- Shark
- Swordfish
- King Mackerel
- Tilefish (from the Gulf of Mexico)
- Marlin
- Orange Roughy
- Bigeye Tuna
Frequently Asked Questions About Tuna and Breastfeeding
Is it okay to eat canned tuna every day while breastfeeding?
It is best not to eat it every single day. The FDA and EPA recommend 2 to 3 servings (8 to 12 ounces total) per week of "Best Choice" fish like canned light tuna. If you prefer Albacore, you should limit it to just one serving (6 ounces) per week. Spacing out your intake allows your body to process any trace amounts of mercury naturally.
Can mercury in tuna cause my baby to be fussy or gassy?
Mercury itself does not usually cause immediate symptoms like gas or fussiness. However, some babies are sensitive to the strong flavors of fish that can pass into breast milk. If you notice your baby is particularly irritable every time you eat tuna, you might try a milder fish like tilapia or take a short break to see if their behavior changes.
Does tuna help with my "postpartum brain fog"?
It certainly can help! The DHA found in tuna is essential for brain health, and the high protein content helps stabilize your blood sugar. When your blood sugar is stable and you are getting the right fats, you are likely to feel more alert and focused. Tuna is also a source of Vitamin B12, which is a major energy-booster.
Should I choose tuna in oil or tuna in water?
Tuna in water is generally the better choice for breastfeeding moms. The healthy omega-3 fatty acids in tuna are fat-soluble, meaning they can leach out into the packing oil. When you drain the oil, you lose some of those beneficial fats. With water-packed tuna, the nutrients stay in the fish where they belong.
Conclusion
So, is tuna good while breastfeeding? The answer is a resounding yes—with a few simple guidelines. By sticking to "chunk light" varieties and limiting your intake to 2 to 3 servings a week, you can enjoy a convenient, affordable source of protein and brain-boosting DHA. Remember that your health and well-being are the foundation of your breastfeeding journey. When you nourish yourself with high-quality foods, you are also nourishing your baby.
Breastfeeding is natural, but that does not mean it is always easy. Whether you are navigating concerns about your diet or looking for ways to support your milk supply, know that we are here for you. You are doing an incredible job, and every drop of milk you provide is a gift to your baby.
Your Next Steps:
- Check your pantry and swap out Albacore for Chunk Light tuna for your everyday meals.
- Aim for two servings of low-mercury fish this week.
- If you feel like your body needs a little extra support, explore our lactation treats collection and lactation supplements collection to help you reach your breastfeeding goals.
"Every drop counts—and your well-being matters just as much as your baby's. Nourish yourself so you can continue to nourish them."
This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.
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