What Food To Avoid In Breastfeeding: A Guide For New Moms

Posted on January 26, 2026

Your Breastfeeding Diet: Foods to Consider Avoiding

Introduction
The Reality of the Breastfeeding Diet
High-Mercury Fish to Avoid
Managing Caffeine Intake
Alcohol and Breastfeeding Safety
Herbs That May Decrease Milk Supply
Navigating "Gassy" Foods
Spicy Foods and Strong Flavors
Identifying Food Sensitivities and Allergies
The Importance of Hydration
Nourishing Your Body for Success
What to Do if You Suspect a Food Issue
Conclusion
FAQ

Introduction

Choosing what to eat when you are breastfeeding can feel like a high-stakes guessing game. After nine months of pregnancy restrictions, many parents look forward to enjoying their favorite meals again. However, it is natural to worry that a spicy taco or an extra cup of coffee might affect your baby’s sleep or digestion. The truth is that your body is incredibly efficient at filtering what goes into your milk, and most foods are perfectly safe to enjoy in moderation.

At Milky Mama, we believe that breastfeeding support should feel compassionate and empowering. We know you want the best for your little one, but you also deserve a diet that makes you feel nourished and satisfied. This post will cover which foods you may want to limit, which herbs can impact your supply, and how to identify if your baby is reacting to something in your diet.

Our goal is to help you navigate these choices with confidence and clinical expertise. While there are a few specific items to watch out for, you might be surprised to learn how varied and flexible your postpartum diet can actually be. Understanding these nuances helps you focus on what really matters: your recovery and your bond with your baby.

The Reality of the Breastfeeding Diet

One of the most common myths is that you must eat a "perfect" diet to produce high-quality milk. In reality, your body prioritizes your baby’s nutrition. Even if your diet isn't ideal on a given day, your milk will still contain the essential vitamins, proteins, and fats your infant needs to grow.

However, your own well-being matters just as much. Breastfeeding requires a significant amount of energy. Most nursing parents need an extra 450 to 500 calories per day to maintain their energy levels and milk production. Restricting your diet too much can lead to exhaustion and may even impact your mood during the fourth trimester.

When we talk about what food to avoid in breastfeeding, we are usually looking at three categories. These include substances that can be harmful in large amounts, items that might decrease your milk supply, and foods that could potentially cause discomfort for your baby.

High-Mercury Fish to Avoid

Fish is an excellent source of protein and omega-3 fatty acids, which are vital for your baby's brain and eye development. However, certain types of fish contain high levels of methylmercury. This is a heavy metal that can pass through breast milk and potentially affect a developing baby’s nervous system.

You do not need to avoid fish altogether, but you should be selective. To keep your milk as safe as possible, many lactation experts recommend avoiding the following high-mercury fish:

Shark
Swordfish
King Mackerel
Marlin
Bigeye Tuna

Instead of these options, try to focus on low-mercury fish like salmon, sardines, trout, or tilapia. These provide the healthy fats you need without the high risk of heavy metal exposure. If you enjoy canned tuna, choose "light" tuna over "white" or albacore, as it generally has lower mercury levels. Aim for about two to three servings of low-mercury fish per week to get the maximum benefit for you and your baby.

Managing Caffeine Intake

Many new parents rely on caffeine to get through the sleep deprivation that comes with a newborn. The good news is that you do not have to give up your morning latte. Most experts and health organizations, including the CDC, suggest that consuming up to 300 milligrams of caffeine per day is safe for most breastfeeding families. This is roughly the amount in two to three small cups of brewed coffee.

Caffeine does pass into breast milk, but usually only in very small amounts. However, newborns and preterm infants are much more sensitive to it because their bodies take longer to process and clear caffeine from their systems. If you consume excessive amounts, you might notice your baby becoming:

Restless or irritable
Unusually wakeful or jittery
Difficulty settling down for naps

It is also important to remember that caffeine hides in more than just coffee. Tea, soda, energy drinks, and even dark chocolate contribute to your daily total. If you notice your baby is particularly sensitive, try spacing your caffeine intake so you enjoy it right after a feeding session. This gives your body more time to metabolize the caffeine before the next time your baby nurses.

Alcohol and Breastfeeding Safety

The relationship between alcohol and breastfeeding is often misunderstood. While it is safest to avoid alcohol entirely, an occasional drink is generally not considered harmful to a healthy, full-term infant. The key is understanding how alcohol moves through your system.

Alcohol levels in your breast milk are roughly the same as the levels in your bloodstream. It does not "store" in the milk; as your blood alcohol level drops, the level in your milk drops as well. Many lactation consultants recommend the "two-hour rule." This means waiting at least two hours after a single standard drink before you nurse your baby.

A standard drink is typically defined as:

12 ounces of 5% beer
5 ounces of 12% wine
1.5 ounces of 80-proof spirits

If you have more than one drink, it is often suggested to wait longer or use previously expressed milk. It is a common myth that drinking beer increases milk supply. In fact, alcohol can actually inhibit the let-down reflex. This is the physiological response where your body releases milk from the small sacs in your breast into the ducts. Excessive alcohol can also make your baby drowsy or affect their normal weight gain, so moderation is essential.

Herbs That May Decrease Milk Supply

While many people focus on galactagogues—substances that may help increase milk supply—it is equally important to know about anti-galactagogues. These are herbs and foods that can potentially decrease the amount of milk you produce.

For most people, using these herbs in small amounts for cooking (like a sprinkle of dried parsley on a potato) won't cause an issue. However, consuming them in high concentrations, such as in medicinal teas or supplements, can have a noticeable impact.

Peppermint and Menthol

Large amounts of peppermint have been known to reduce milk supply. This includes peppermint tea, peppermint candies, and even strong menthol cough drops. If you find your supply dipping, check if you have recently increased your intake of peppermint-flavored items.

Sage and Rosemary

Sage is frequently used by parents who are looking to dry up their milk supply during weaning. Because it is so effective at reducing milk production, it should be avoided in large quantities while you are actively trying to maintain or increase your supply.

Parsley

While a small garnish is fine, eating large amounts of fresh parsley (like in a tabbouleh salad) may impact some parents' milk production. If you are struggling with low supply, it is best to keep parsley consumption to a minimum.

Key Takeaway: If you notice a sudden dip in your milk volume, review your intake of peppermint, sage, or parsley. These herbs are often more powerful supply-suppressants than most parents realize.

Navigating "Gassy" Foods

One of the oldest pieces of advice given to breastfeeding parents is to avoid "gassy" foods like broccoli, cabbage, beans, and onions. The theory is that if these foods make the parent gassy, they will make the baby gassy too.

However, the biology of breastfeeding doesn't quite work that way. Gas is produced in the digestive tract when bacteria break down fiber. Fiber and gas do not pass into your bloodstream, which means they cannot pass into your breast milk.

If your baby seems gassy after you eat broccoli, it is likely a coincidence or a sensitivity to a specific protein in the food rather than the gas itself, and our guide to foods that upset baby’s stomach when breastfeeding can help you think through the difference. Most babies are naturally gassy as their digestive systems mature. Unless you notice a consistent pattern where your baby is in obvious distress every time you eat a specific vegetable, there is no clinical reason to cut these nutritious foods out of your diet.

Spicy Foods and Strong Flavors

Many cultures around the world consume highly spiced diets while breastfeeding without any issues. In fact, exposing your baby to different flavors through your milk can be a good thing. This exposure may make your child more open to trying different foods when they start solids later on.

Flavors like garlic, curry, and chili peppers do pass into the milk. While some babies might be put off by a sudden change in taste, many don't seem to mind at all. There is even some evidence that babies may nurse longer when the milk tastes like garlic!

If you eat a very spicy meal and notice your baby is fussier than usual or has a diaper rash, you might consider backing off the spice for a few days to see if their behavior improves. Every baby is an individual, and while some are "foodies" from the start, others may prefer a more consistent, mild flavor profile.

Identifying Food Sensitivities and Allergies

While true food allergies in breastfed babies are relatively rare, they do happen. The most common culprit is Cows' Milk Protein Allergy (CMPA). This is different from lactose intolerance. CMPA occurs when the baby’s immune system reacts to the proteins found in the dairy products the parent consumes.

If your baby has a sensitivity or allergy to something in your diet, you will usually see more than just a little fussiness. Look for the following signs:

Skin Issues: Eczema, hives, or a persistent, angry red rash.
Digestive Distress: Frequent vomiting (more than just typical "spit-up"), diarrhea, or extreme constipation.
Respiratory Problems: Persistent wheezing, coughing, or a chronic runny nose.
Stool Changes: Mucus in the stool or specks of blood.

If you suspect your baby is reacting to dairy, soy, or another common allergen, do not start a restrictive elimination diet on your own. It is vital to consult with a pediatrician or a certified lactation consultant first, and the breastfeeding help page is a good place to start if you want virtual support. They can help you determine the cause of the symptoms and ensure you are still getting the nutrition you need if you have to cut out certain food groups.

The Importance of Hydration

While not a food, what you drink is just as important as what you eat. Breast milk is about 87% water. If you are dehydrated, your body will prioritize your baby’s needs, but you will likely feel sluggish, dizzy, and irritable.

A good goal for most breastfeeding parents is to drink about 12 tall glasses of water per day. A simple way to stay on track is to drink a glass of water every time you sit down to nurse or pump.

If you find plain water boring, we offer several delicious ways to stay hydrated. Our Lactation Drink Mixes and Pumpin Punch™ are designed to provide hydration along with lactation-support ingredients. These can be a great way to meet your fluid goals while enjoying a refreshing treat. Remember, your body's thirst cues are usually a reliable guide—if you feel thirsty, your body is already asking for more fluids.

Nourishing Your Body for Success

Instead of focusing only on what to avoid, it is helpful to think about what you can add to your diet to feel your best. Breastfeeding is a marathon, not a sprint. You need sustained energy to keep up with the demands of a growing baby.

Focusing on whole, nutrient-dense foods can make a big difference in your recovery and your supply. Some excellent options include:

Oats and Whole Grains: These provide complex carbohydrates for steady energy and fiber for digestive health.
Healthy Fats: Avocado, nuts, and seeds are great for satiety and help keep your milk rich.
Leafy Greens: Spinach and kale are packed with calcium, iron, and vitamin A.
Lean Protein: Beef, beans, and eggs provide the zinc and protein necessary for tissue repair.

Our Emergency Brownies are one of our most-loved lactation treats, packed with oats, brewer's yeast, and flaxseed to help support supply. Including treats like these can make your breastfeeding journey feel more like a celebration and less like a list of chores.

What to Do if You Suspect a Food Issue

If you are worried that something you are eating is causing problems for your baby, take a deep breath. You are doing an amazing job, and these challenges are a normal part of the learning curve.

Keep a Food Diary: For three to five days, jot down what you eat and note your baby’s behavior, sleep patterns, and bowel movements. This can help you identify actual patterns versus random occurrences.
Change One Thing at a Time: If you suspect an issue, try removing one specific food (like dairy) for two weeks. It can take that long for proteins to fully clear your system and for your baby's gut to settle.
Consult the Pros: If you see blood in the stool or if your baby is losing weight, contact your pediatrician immediately. For general fussiness or supply concerns, a virtual lactation consultation can provide personalized guidance.
Prioritize Your Mental Health: If a restrictive diet is making you miserable, it may be time to re-evaluate. Your well-being is a critical part of the breastfeeding relationship.

Conclusion

Navigating what food to avoid in breastfeeding doesn't have to be overwhelming. For the vast majority of parents, a varied diet that includes your favorite foods is perfectly fine. By limiting high-mercury fish, keeping an eye on caffeine and alcohol, and being mindful of supply-suppressing herbs, you are already doing everything necessary to protect your milk.

Remember, every drop counts, and you are providing your baby with the best possible start. Focus on nourishing yourself, staying hydrated, and listening to your body’s needs. We are here to support you every step of the way with resources and products designed to make your breastfeeding experience as smooth as possible.

"Breasts were literally created to feed human babies. Trust your body, listen to your baby, and remember that your wellness is the foundation of your family."

If you need an extra boost, consider exploring our lactation supplements collection and support products like Pumping Queen™ or Lady Leche™, which are formulated to support supply without the use of common irritants. You can also build on your pumping routine with practical guidance from our article on how to increase milk supply while pumping. You’ve got this, and we are so proud of the work you are doing 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

Can I eat spicy food while breastfeeding?

Yes, most babies tolerate spicy foods just fine. The flavors of garlic, peppers, and spices do pass into your milk, but this actually helps your baby develop a taste for different foods later in life. If you notice your baby is exceptionally fussy or has a diaper rash after you eat something very spicy, you may want to reduce the heat for a few days to see if it helps.

How much caffeine is safe to drink while nursing?

Most experts recommend limiting caffeine to about 300 milligrams per day, which is roughly two to three cups of coffee. While a small amount passes into the milk, it generally doesn't bother most babies. However, if your baby seems jittery or has trouble sleeping, you might try reducing your intake or timing your coffee for right after a nursing session.

Do I really need to avoid "gassy" foods like broccoli and beans?

There is no clinical evidence that "gassy" foods in a parent's diet cause gas in a breastfeeding baby. Gas is produced in your own intestines as you digest fiber, and that gas cannot pass into your bloodstream or your milk. Unless your baby has a specific sensitivity to a protein in those foods, there is no reason to avoid these healthy vegetables.

Which herbs should I avoid to maintain my milk supply?

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