What Foods Should I Not Eat When Breastfeeding?

Posted on January 26, 2026

Introduction
The Good News About Your Breastfeeding Diet
High-Mercury Fish: A Necessary Limitation
Navigating Caffeine and Sleep
Alcohol Consumption and Breastfeeding
Herbs That May Lower Your Milk Supply
Debunking the "Gassy Food" Myth
Cow’s Milk Protein Allergy (CMPA)
Spicy Foods and Strong Flavors
Special Considerations for Vegan and Vegetarian Moms
Practical Steps for Managing Your Diet
Nourishing Yourself for the Long Haul
Summary Checklist for Breastfeeding Nutrition
Conclusion
FAQ

Introduction

The moment you bring your baby home, your brain suddenly fills with a million questions. One of the most common things we hear from new parents is the worry that a mid-day latte or a spicy taco might upset their little one’s tummy. It is completely normal to feel protective over what goes into your body when you know it is helping to nourish your baby. You want to give them the best start possible, and that often leads to searching for a list of "forbidden" foods.

At Milky Mama, we believe that breastfeeding support should feel empowering, not restrictive. We know you are already doing a lot of hard work, and the last thing you need is a rigid, stressful diet. Most of the time, you can continue eating the foods you love while successfully nursing. However, there are a few specific items that require a little extra attention—either because they can affect your baby’s comfort or because they might impact your milk supply. If you ever want personalized support, our Certified Lactation Consultant Breastfeeding Help page is a great place to start.

This post covers which foods are truly best to limit, how to spot if your baby is sensitive to something in your diet, and which herbs might unexpectedly dip your supply. Our goal is to help you navigate your postpartum nutrition with confidence and ease. Remember, you're doing an amazing job, and a well-nourished mama is a happy mama.

The Good News About Your Breastfeeding Diet

Before we dive into what to limit, let’s talk about the big picture. One of the most beautiful things about our bodies is how resilient they are. Your body is designed to prioritize your baby’s nutrition. Even if your diet isn't "perfect" every single day, your milk will still be the gold standard of nutrition for your infant.

For the most part, you do not need to follow a special diet to produce high-quality milk. We encourage you to eat a wide variety of flavors because this actually helps your baby. Traces of the foods you eat pass into your milk, which introduces your baby to different tastes. This can actually make the transition to solid foods much smoother later on.

Instead of focusing on restriction, we like to focus on nourishment. You generally need about 330 to 500 extra calories per day to support lactation. If you feel hungrier than usual, listen to your body! It is working overtime to create life-sustaining milk. Focus on hydration and nutrient-dense snacks to keep your energy up. For more breastfeeding basics, the Breastfeeding 101 course is a helpful next step.

Key Takeaway: Most foods are safe to eat in moderation. Your milk is specifically designed for your baby, and your body is incredibly efficient at producing it regardless of your daily menu.

High-Mercury Fish: A Necessary Limitation

When you are looking at what foods you should not eat when breastfeeding, seafood is often at the top of the list. Fish is a fantastic source of protein and omega-3 fatty acids, which are vital for your baby’s brain development. However, certain types of fish can contain high levels of methylmercury.

Mercury is a metal that can pass through your breast milk and potentially affect your baby's developing nervous system. While the benefits of eating fish usually outweigh the risks, it is important to choose the right types.

Fish to Avoid Entirely

Some fish live longer and grow larger, allowing more mercury to accumulate in their tissues. You should generally avoid:

Shark
Swordfish
King Mackerel
Tilefish from the Gulf of Mexico
Marlin
Orange Roughy

Safe Seafood Choices

You can still enjoy seafood 2 to 3 times per week. Focus on "Best Choice" options that are low in mercury but high in nutrients:

Salmon
Trout
Sardines
Anchovies
Shrimp
Pollock

If you enjoy tuna, try to stick to "light canned" tuna rather than albacore or tuna steaks, as the latter have higher mercury levels. A good rule of thumb is to limit albacore tuna to about 6 ounces per week.

What to do next:

Check local advisories if you eat fish caught by friends or family in local lakes.
Aim for 8 to 12 ounces of low-mercury fish per week.
If you don't like fish, consider an algae-based DHA supplement to support baby's brain health.

Navigating Caffeine and Sleep

We know that many new parents feel like they are running on fumes. That morning cup of coffee can feel like a lifeline. The good news is that you don’t have to give up your caffeine fix entirely. However, caffeine does pass into your breast milk in small amounts.

Most babies can handle a moderate amount of caffeine without any issues. Generally, up to 300 milligrams per day is considered safe. This is roughly the amount in two to three 8-ounce cups of brewed coffee.

Signs Your Baby is Sensitive to Caffeine

Every baby is different. Some infants are "caffeine sensitive" and may process it more slowly than adults. This is especially true for newborns and preterm babies. Watch for these signs:

Unusual irritability or fussiness.
Difficulty falling asleep or staying asleep.
Hyper-alertness or "jitters."

If you notice these behaviors, try cutting back your intake for a few days to see if their temperament improves. Remember that caffeine isn't just in coffee; it's also found in black tea, green tea, energy drinks, soda, and even chocolate.

Alcohol Consumption and Breastfeeding

There is a lot of conflicting information out there about alcohol and nursing. The safest choice is always to avoid alcohol, but having an occasional drink is generally not a reason to stop breastfeeding.

Alcohol levels in your milk match the alcohol levels in your bloodstream. As your body metabolizes the alcohol, the levels in your milk drop as well. You do not need to "pump and dump" to remove alcohol from your system; it leaves the milk naturally as it leaves your blood.

Safety Guidelines for an Occasional Drink

If you choose to have a drink, timing is everything.

Wait to feed: It generally takes about 2 to 3 hours for one standard drink to clear your system.
Size matters: A "standard drink" is 12 ounces of 5% beer, 5 ounces of 12% wine, or 1.5 ounces of 80-proof liquor.
Eat and hydrate: Having food in your stomach can slow the absorption of alcohol.
Plan ahead: If you know you will be having a drink, you can express milk beforehand to have on hand for the baby.

It is very important to never bed-share or sleep on a sofa with your baby if you have been drinking, as this significantly increases the risk of SIDS and accidental suffocation.

Herbs That May Lower Your Milk Supply

While we often talk about foods that boost supply, it is just as important to know about "anti-galactagogues." These are herbs and foods that may actually decrease the amount of milk you produce. If you have a robust supply, a little bit of these won't hurt, but if you are struggling with low output, you may want to avoid them.

Peppermint and Spearmint

In large quantities, peppermint can have a drying effect on milk supply. This includes peppermint tea, strong mint candies, or even excessive amounts of peppermint oil. An occasional thin mint cookie is usually fine, but avoid drinking several cups of peppermint tea daily.

Sage, Parsley, and Rosemary

These culinary herbs are often used in high concentrations to help dry up milk during weaning. If you are trying to maintain your supply, be cautious with dishes that use large amounts of these herbs, such as certain stuffings or heavy herbal sauces.

The Role of Antihistamines

While not a food, it’s worth noting that certain medications like Sudafed (pseudoephedrine) and some antihistamines can significantly decrease milk production. If you have a cold or allergies, check with your healthcare provider or a lactation consultant for breastfeeding-friendly alternatives.

If you are concerned about your supply, we often recommend focusing on hydration and nourishing snacks. Our Pumpin' Punch™ drink mix is a great way to stay hydrated while providing your body with the nutrients it needs to support lactation. You can also browse the full Lactation Drink Mixes collection for more options.

Key Takeaway: If you notice a sudden dip in supply, check your recent meals for high concentrations of mint, sage, or parsley.

Debunking the "Gassy Food" Myth

One of the biggest misconceptions about breastfeeding is that "gassy" vegetables like broccoli, cabbage, and beans will cause gas in your baby.

Gas is produced when bacteria in the gut break down fiber. Fiber does not pass into your breast milk. Therefore, the gas you feel from eating a big bowl of beans stays in your gut. It does not travel through your blood and into your milk to make the baby gassy. If you want a broader look at how diet and breastfeeding connect, this diet and breast milk supply guide is a helpful read.

However, some babies are sensitive to the proteins in certain foods. If your baby seems consistently uncomfortable after you eat a specific food, it’s worth paying attention to. But don’t start cutting out healthy vegetables just because of an old wives' tale!

When to Suspect a Sensitivity

Instead of assuming it’s the broccoli, look for patterns. A true food sensitivity or allergy usually presents with more than just a little gas. Look for:

Excessive spitting up or vomiting.
Colic-like crying for hours.
Diarrhea or very green, mucousy stools.
Skin rashes or eczema.
Congestion or wheezing.

Cow’s Milk Protein Allergy (CMPA)

The most common food sensitivity in breastfed babies is not spicy food or "gassy" veggies—it is cow's milk protein. This is different from lactose intolerance. CMPA happens when the baby’s immune system reacts to the proteins found in the dairy products you eat.

If your baby is diagnosed with a cow’s milk protein allergy, your healthcare provider may suggest you remove all dairy from your diet. This includes milk, cheese, yogurt, butter, and even "hidden" dairy in processed foods (like whey or casein).

It can take 2 to 4 weeks for the dairy proteins to completely leave your system and for the baby's gut to heal. If you are going dairy-free, you may also need to be careful with soy, as many babies who react to dairy also react to soy proteins.

How to manage a dairy-free diet:

Read labels carefully for hidden dairy.
Focus on calcium-rich alternatives like almonds, leafy greens, and fortified cereals.
Consider a supplement to ensure you are getting enough Vitamin D and Calcium.
Our Lady Leche™ herbal supplement is a great option for those looking to support their supply while maintaining a clean, dairy-free routine. You can also explore the full Lactation Supplements collection.

Spicy Foods and Strong Flavors

Many cultures around the world consume spicy, garlic-heavy, and highly seasoned foods while breastfeeding without any issues. In fact, research shows that babies often like the flavor of garlic in breast milk and may actually nurse longer when the milk is flavored with it!

If you love spicy food, there is usually no reason to stop eating it. Some parents worry that spicy food will cause a diaper rash, but this is rare. If your baby seems to have a reaction every time you eat five-alarm chili, then you might consider dialing back the heat. Otherwise, enjoy your spices!

Special Considerations for Vegan and Vegetarian Moms

If you follow a plant-based diet, you can absolutely breastfeed successfully. However, there are a few nutrients you need to be mindful of to ensure both you and your baby stay healthy.

Vitamin B12: This is primarily found in animal products. A deficiency in B12 can lead to serious neurological issues for your baby. If you are vegan, a B12 supplement is essential.
Iron: Plant-based iron (non-heme) isn't absorbed as easily as iron from meat. Pair your iron-rich foods (like lentils and spinach) with Vitamin C (like citrus or bell peppers) to boost absorption.
Choline and Iodine: These are crucial for brain development. If you don't eat eggs or dairy, look for fortified foods or a high-quality postnatal vitamin.

We recommend working with your healthcare provider to monitor your levels and determine if you need additional supplementation during your breastfeeding journey.

Practical Steps for Managing Your Diet

If you are worried that your baby is reacting to something you are eating, don't panic. You don't have to go on a "bland" diet of just chicken and rice. Instead, try a systematic approach. For more support with common breastfeeding challenges, the Breastfeeding 101 course can help you build a stronger foundation.

Keep a Food Diary: Note what you eat and the times your baby seems most fussy or has unusual stools.
Look for Patterns: Don't react to a one-time event. Look for things that happen consistently 2 to 12 hours after you eat a specific food.
Eliminate One Thing at a Time: If you suspect dairy, cut out only dairy for two weeks. If you cut out five things at once, you won't know which one was actually the culprit.
Consult a Professional: If you are seeing blood in the stool or your baby isn't gaining weight, see your pediatrician or an IBCLC (International Board Certified Lactation Consultant) immediately.

Nourishing Yourself for the Long Haul

Breastfeeding is a marathon, not a sprint. To keep up your energy and your milk supply, you need to nourish yourself. This isn't just about avoiding "bad" foods; it's about including the "good" ones.

At Milky Mama, we love seeing parents embrace a varied, delicious diet. Foods like oats, flaxseed, and brewer’s yeast are traditional favorites for a reason—they are packed with nutrients that support a healthy supply. Our Emergency Lactation Brownies are a fan-favorite for this exact reason, and the full Lactation Snacks collection has more convenient options for busy days.

You are doing the hard work of feeding a human being. Be kind to yourself. If you have a day where you eat nothing but crackers and cheese because that's all you had the energy for, that’s okay. If you occasionally have a glass of wine or an extra cup of coffee, that’s okay too.

Focus on how you feel and how your baby is growing. If your baby is meeting their milestones, having plenty of wet diapers, and generally seems content, then your diet is likely doing exactly what it needs to do.

Summary Checklist for Breastfeeding Nutrition

To make things easy, here is a quick summary of the main points to remember:

Avoid High-Mercury Fish: Skip shark, swordfish, and king mackerel.
Moderate Caffeine: Keep it under 300mg (about 2-3 cups of coffee) per day.
Watch for Supply Killers: Be cautious with large amounts of peppermint, sage, and parsley.
Monitor for Allergies: Dairy is the most common culprit for true sensitivities.
Ignore the Gas Myths: Most vegetables are perfectly safe and won't make your baby gassy.
Stay Hydrated: Drink to thirst and focus on nutrient-dense snacks.

Key Takeaway: Trust your body and your baby. If you aren't seeing signs of distress, you are likely doing everything right. Every drop of milk you provide is a gift.

Conclusion

Navigating what foods you should not eat when breastfeeding doesn't have to be a source of stress. While it is wise to limit high-mercury fish and keep an eye on your caffeine and alcohol intake, the vast majority of foods are perfectly safe and even beneficial. Your baby is getting a world of flavor through your milk, preparing them for a lifetime of healthy eating.

If you ever feel overwhelmed or notice your supply dipping, remember that support is available. Whether it's adjusting your meal plan or incorporating supportive treats like our lactation cookies, you don't have to do this alone. You may also want to explore the Courses collection or connect with the Milky Mama lactation support community on Facebook. You are providing your baby with the perfect nutrition, and your well-being is just as important as theirs. Keep up the incredible work, mama—you’ve got this.

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

FAQ

Does spicy food cause diaper rash in breastfed babies?

For most babies, spicy food in the mother’s diet does not cause diaper rash. While flavors do pass into the milk, the "heat" from capsaicin usually doesn't affect the baby's skin. If you notice a consistent rash after eating spicy meals, it’s worth discussing with your pediatrician, but it is rarely the direct cause.

Can I drink peppermint tea while breastfeeding?

An occasional cup of peppermint tea is generally fine for most people. However, peppermint is known as an anti-galactagogue, meaning large amounts can potentially lower milk supply. If you are struggling with low milk production, it is best to avoid peppermint and spearmint until your supply is well-established.

How long does it take for food I eat to reach my breast milk?

Most flavors and nutrients appear in breast milk about 2 to 6 hours after consumption. However, this can vary depending on your metabolism and the type of food. If you are trying to track a sensitivity, look for reactions in your baby within that 2-to-12-hour window.

Should I avoid peanuts to prevent my baby from having an allergy?

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What Foods Should I Not Eat When Breastfeeding?

Table of Contents

Introduction

The Good News About Your Breastfeeding Diet