Is Mackerel Good for Breastfeeding? A Guide to Safe Seafood
Posted on May 27, 2026
Table of Contents
- Introduction
- The Short Answer: It Depends on the Type
- Nutritional Benefits of Mackerel for Breastfeeding
- The Mercury Concern: Why Variety Matters
- How to Safely Eat Mackerel While Breastfeeding
- Supporting Your Supply Naturally
- Recognizing Sensitivities in Your Baby
- Common Myths About Seafood and Breastfeeding
- Other Ways to Boost Your Nutrition
- Summary of Safe Seafood Choices
- Conclusion
- FAQ
Introduction
If you are currently breastfeeding, you likely know that post-pregnancy hunger is a very real thing. You are working hard to nourish your baby, and your body needs extra fuel to keep up with the demands of milk production. Many parents find themselves questioning every meal, wondering what is safe and what might impact their milk supply or their baby's health. You may be looking at a piece of fish and wondering: is mackerel good for breastfeeding?
At Milky Mama, we know that navigating nutrition can feel overwhelming when you are already dealing with sleep deprivation and diaper changes. We want to empower you with the knowledge to make choices that feel right for your family, and our Certified Lactation Consultant Breastfeeding Help page is there when you want a more personal next step.
This article covers the nutritional benefits of mackerel, the critical difference between various types of mackerel, and how to safely include seafood in your breastfeeding diet. We will explore how specific nutrients support your baby's development and provide practical tips for maintaining a healthy milk supply. Understanding which fish are safe allows you to enjoy a varied diet while keeping your little one's safety a top priority.
The Short Answer: It Depends on the Type
When it comes to the question of whether mackerel is good for breastfeeding, the answer depends entirely on the specific variety of mackerel you choose. In the world of seafood, mackerel is not a single category; instead, it includes several species that have vastly different levels of mercury.
Mercury is a heavy metal that can accumulate in the bodies of fish. When a breastfeeding parent consumes fish high in mercury, that mercury can pass through breast milk to the baby. Because infants have developing nervous systems, they are much more sensitive to the effects of mercury than adults are.
The two main types of mackerel you will encounter are:
- Atlantic and Pacific Mackerel: These are generally smaller fish. They are considered "Best Choices" by the FDA and EPA. They are low in mercury and high in beneficial nutrients.
- King Mackerel: This is a much larger predatory fish. Because it lives longer and eats other fish, it accumulates high levels of mercury. It is on the "Choices to Avoid" list for breastfeeding parents.
As long as you are choosing Atlantic or Pacific mackerel (often found canned or fresh in many grocery stores), mackerel is not just safe—it is incredibly nutritious for both you and your baby.
Nutritional Benefits of Mackerel for Breastfeeding
If you select the low-mercury varieties, mackerel is a nutritional powerhouse. It is packed with vitamins, minerals, and healthy fats that are specifically beneficial during the postpartum period.
Rich in Omega-3 Fatty Acids (DHA and EPA)
One of the primary reasons lactation consultants and healthcare providers recommend certain fish is for their Omega-3 content. Mackerel is one of the best sources of Docosahexaenoic Acid (DHA) and Eicosapentaenoic Acid (EPA).
DHA is a type of fat that is essential for your baby’s brain and eye development. During the first year of life, a baby’s brain grows at a rapid pace. Research suggests that when breastfeeding parents have adequate DHA in their diet, it increases the levels of DHA in their breast milk, which may support the infant’s cognitive development and visual acuity.
High in Vitamin D and B12
Many people, including new parents, are deficient in Vitamin D. Mackerel is one of the few natural food sources of this essential vitamin. Vitamin D is vital for bone health and immune function.
Additionally, mackerel is an excellent source of Vitamin B12. This vitamin is necessary for energy production and the health of your nervous system. Since breastfeeding can be exhausting, ensuring you have enough B12 can help you manage the physical demands of early parenthood.
High-Quality Protein
Your body requires extra protein to produce breast milk and to repair tissues after childbirth. Mackerel provides high-quality protein that contains all the essential amino acids your body needs. Including protein at every meal can also help keep you feeling full and satisfied, which is helpful when you are dealing with "breastfeeding hunger."
Key Takeaway: Choosing Atlantic or Pacific mackerel provides essential DHA for your baby's brain development and much-needed Vitamin D and B12 for your own postpartum recovery.
The Mercury Concern: Why Variety Matters
To understand why we must be careful with fish like King Mackerel, we have to look at how mercury works in the environment. Mercury occurs naturally but is also released into the air and water through industrial activities. Once it enters the water, bacteria convert it into methylmercury.
Fish absorb this methylmercury as they swim and feed. Smaller fish, like Atlantic mackerel or sardines, have less mercury because they are lower on the food chain and have shorter lifespans. Larger fish, like King Mackerel, shark, or swordfish, eat many smaller fish. This process is called bioaccumulation. By the time a large King Mackerel is caught, it has concentrated a significant amount of mercury in its tissues.
How Mercury Affects Breast Milk
When you eat high-mercury fish, the mercury enters your bloodstream and can be passed into your breast milk. While the benefits of breastfeeding almost always outweigh the risks of minor environmental exposures, high levels of mercury can be toxic.
Potential effects of high mercury exposure in infants include delays or impairments in:
- Cognitive development
- Fine motor skills
- Speech and language development
- Visual-spatial awareness
Because of these risks, it is best to stick to the "Best Choices" list provided by the FDA.
How to Safely Eat Mackerel While Breastfeeding
If you want to enjoy mackerel, the goal is to maximize the nutrients while minimizing the risks. Here is how to do it safely:
1. Check the Label
When buying mackerel, always check the specific species. If the label simply says "mackerel," try to verify the source. Canned mackerel is often Atlantic or Pacific, but it is always worth a quick check. Avoid any fish labeled as "King Mackerel."
2. Follow the "Two to Three Servings" Rule
The FDA and EPA recommend that breastfeeding parents eat 8 to 12 ounces of a variety of seafood from the "Best Choices" list per week. This usually equates to two or three servings.
- A serving is roughly 4 ounces, or about the size of the palm of your hand.
- If you choose a fish from the "Good Choices" list (like Spanish Mackerel), limit it to one serving per week and avoid other fish that week.
3. Mix It Up
Do not rely on just one type of fish. By eating a variety of low-mercury seafood—such as salmon, Atlantic mackerel, sardines, and trout—you ensure a broad range of nutrients while further reducing the risk of overexposure to any single contaminant.
4. Preparation Matters
While cooking does not remove mercury (as it is bound to the protein in the fish), how you prepare your fish can still impact your health. Removing the skin and fat before cooking can help reduce other environmental pollutants, like PCBs, which tend to store in the fatty tissues of the fish.
What to do next:
- Look for Atlantic mackerel in the canned fish aisle as a budget-friendly option.
- Swap one tuna sandwich per week for a mackerel salad to boost your DHA.
- Keep a list of "Best Choice" fish on your phone for easy reference while grocery shopping.
Supporting Your Supply Naturally
While mackerel provides the building blocks for healthy milk, many parents worry about the amount of milk they are producing. Nutrition is just one piece of the puzzle. If you are looking to support your milk supply, it is important to focus on hydration and frequent milk removal (the "supply and demand" principle).
We often hear from parents who feel like they are doing everything right but still feel a dip in supply. This is where targeted support can help. At Milky Mama, we offer a range of herbal lactation supplements that many moms find helpful. Our Lady Leche™ supplement is designed with specific herbs to support lactation.
This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with your healthcare provider for medical advice.
In addition to supplements, don't forget the importance of calories and hydration. If you are struggling to find time to eat a full meal (like a mackerel salad), having nutrient-dense snacks on hand is a must. Our lactation treats are a simple way to keep something nourishing within reach.
Our Emergency Brownies are one of our most-loved lactation treats. They are packed with ingredients like oats and flaxseed, providing a delicious way to keep your energy up while supporting your supply.
Recognizing Sensitivities in Your Baby
Even if a food is "safe," every baby is different. Occasionally, a baby might be sensitive to something in their parent's diet. While it is rare for fish specifically to cause a reaction, it is always good to be observant.
If you notice your baby is exceptionally fussy, has a sudden rash, or develops green, mucousy stools after you eat a specific food, they may have a sensitivity. However, do not immediately assume it is the mackerel. Common allergens like cow's milk, soy, and eggs are much more likely to cause issues. If you want a deeper look at patterns like this, What Foods Upset Baby's Stomach When Breastfeeding? can be a helpful place to start.
If you suspect a food sensitivity, it is helpful to keep a simple food diary for a few days. Note what you ate and how your baby behaved or reacted. This information can be incredibly valuable when you speak with your pediatrician or a lactation consultant.
Common Myths About Seafood and Breastfeeding
There is a lot of "old wives' tale" advice floating around the internet, and it can be hard to separate fact from fiction. Let's clear up a few common myths:
Myth: You shouldn't eat any fish while breastfeeding.
Fact: This is actually counterproductive. Fish is one of the best sources of DHA, which is vital for your baby. Avoiding fish altogether might mean you and your baby miss out on these essential fats. The key is choosing the right fish.
Myth: If you eat spicy fish, it will make your milk spicy.
Fact: While flavors from your diet can subtly change the taste of your milk, it rarely bothers babies. In fact, some studies suggest that exposing your baby to various flavors through breast milk may make them less picky when they start eating solid foods later on.
Myth: Canned fish isn't as good as fresh fish.
Fact: Canned Atlantic mackerel and salmon are excellent, affordable options. They retain their high levels of Omega-3 fatty acids and are often more convenient for busy parents. Just keep an eye on the sodium content in some canned varieties.
Myth: You have to "pump and dump" after eating certain foods.
Fact: Pumping and discarding milk is rarely necessary for dietary choices. Mercury stays in your system for a while, so "pumping and dumping" won't remove it from your body. The best approach is prevention—simply avoiding the high-mercury fish in the first place. For a bigger picture on pumping, Pumping & Breastfeeding: Understanding When and Why is a useful read.
Other Ways to Boost Your Nutrition
If you aren't a fan of mackerel or other oily fish, you can still get the nutrients you need.
- Chia Seeds and Walnuts: These are plant-based sources of Omega-3s, though the body doesn't convert them to DHA as efficiently as the fats found in fish.
- Algae-based Supplements: If you are vegetarian or vegan, you can find DHA supplements derived from algae.
- Hydration: Never underestimate the power of water. We recommend staying hydrated throughout the day. If you find plain water boring, Pumpin' Punch™ is a great way to stay hydrated while also supporting your lactation goals.
Key Takeaway: Mackerel is a great tool in your nutritional toolbox, but it’s just one part of a balanced diet. Stay hydrated, eat enough calories, and listen to your body.
Summary of Safe Seafood Choices
To keep things simple, here is a quick reference guide for your next trip to the store:
Best Choices (2-3 servings per week)
- Atlantic Mackerel
- Pacific Mackerel
- Salmon
- Sardines
- Trout
- Herring
- Cod
- Tilapia
- Shrimp
Good Choices (1 serving per week)
- Spanish Mackerel
- Halibut
- Snapper
- Albacore Tuna
Choices to Avoid
- King Mackerel
- Shark
- Swordfish
- Tilefish
- Bigeye Tuna
Conclusion
Is mackerel good for breastfeeding? The answer is a resounding yes, provided you reach for the Atlantic or Pacific varieties. These fish offer a wealth of DHA, protein, and vitamins that support both your baby’s development and your own postpartum recovery. By avoiding King Mackerel and staying within the recommended serving sizes, you can enjoy the benefits of seafood without the worry of mercury exposure.
Remember, you are doing an amazing job. Providing milk for your baby is a major physical feat, and taking the time to care for your own nutrition is a vital part of that journey. Whether you are enjoying a fresh mackerel fillet or grabbing one of our lactation treats for a quick energy boost, know that every healthy choice you make supports your well-being and your baby’s growth.
- Stick to Atlantic or Pacific mackerel for low mercury and high DHA.
- Avoid King Mackerel entirely while breastfeeding.
- Aim for 2-3 servings of "Best Choice" seafood per week.
- Support your supply with hydration, frequent nursing, and nourishing treats.
If you ever feel uncertain about your milk supply or your breastfeeding diet, don't hesitate to reach out for professional support. We offer Breastfeeding 101 to help you navigate your unique journey with confidence and ease.
FAQ
Can I eat mackerel every day while breastfeeding?
It is best not to eat mackerel every day. The FDA and EPA recommend 2 to 3 servings (8-12 ounces) of low-mercury fish per week to balance nutrient intake and minimize exposure to trace contaminants. Eating a variety of different protein sources ensures you get a wide range of vitamins and minerals. If you want a deeper dive into hydration and lactation support, Does Drinking Water Help With Milk Supply? breaks it down clearly.
What is the difference between King Mackerel and Atlantic Mackerel?
The main difference is their size and mercury content. King Mackerel is a large predatory fish that accumulates high levels of mercury, making it unsafe for breastfeeding parents. Atlantic Mackerel is much smaller, lives a shorter life, and is considered a low-mercury "Best Choice" for lactation.
Will eating mackerel increase my milk supply?
While mackerel provides excellent nutrition, it is not a direct galactagogue (a substance that increases milk supply). However, the high protein and healthy fats help support your overall health, which is essential for maintaining a steady supply. For specific supply support, many parents turn to our herbal supplements or lactation treats.
What should I do if I accidentally ate King Mackerel?
Do not panic if you had a single serving of a high-mercury fish. Mercury exposure is generally a concern when it happens consistently over time. Simply avoid high-mercury fish moving forward and stick to the "Best Choices" list for your subsequent meals to balance out your overall exposure.
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