Breastfed Baby Gas Smells Like Rotten Eggs: 4 Causes

Ah, the joys of parenthood – endless cuddles, adorable giggles, and let’s not forget about the wonderful world of baby poop and gas! While some odors can be easily dismissed as part of the parenting package, there is one particularly pungent aroma that can catch any new mom or dad off guard: breastfed baby gas smells like rotten eggs.

In this article, we’ll dive into four common culprits behind this funky fragrance and provide you with some tips on how to handle it like a pro.

Why does my breastfed baby’s gas smell like rotten eggs?

There are a few possible reasons why your breastfed baby’s gas may smell like rotten eggs.

  • One possibility is an infection, such as a gastrointestinal infection, which can cause foul-smelling gas.
  • Another possibility is allergies, either to something in the mother’s diet or to something the baby has been exposed to. Certain foods, such as broccoli and cabbage, can produce gas that smells like sulfur when digested.

To address this issue, it is important to consult with your pediatrician for a proper diagnosis and guidance.

They may recommend adjusting your diet if they suspect that certain foods you are consuming are causing the issue.

They may suggest probiotics or other remedies to help improve digestion and reduce gas production in your baby.

Breastfed Baby Gas Smelling Like Rotten Eggs: 4 Causes

As a new mom, I was completely taken aback when my breastfed baby’s gas started smelling like rotten eggs. It was enough to send me into a panic, wondering what could possibly be wrong.

After consulting with my pediatrician and doing some research of my own, I discovered four possible causes for this unpleasant odor in breastfed babies’ gas.

Mother’s Diet Is High in Sulfur

Sulfur is found in various foods such as eggs, broccoli, cabbage, and garlic. When you consume these foods, they can be broken down by your body and released as sulfur compounds through your breast milk.

While breastfeeding, it’s important to maintain a balanced diet for both your and your baby’s health.

However, if you notice that your baby’s gas smells particularly foul or causes discomfort, it may be worth considering reducing your intake of sulfur-rich foods temporarily to see if there is any improvement.


There are a few steps you can take to alleviate the issue. Try reducing or eliminating foods that are known to be high in sulfur, such as garlic, onions, cruciferous vegetables (broccoli, cauliflower, cabbage), and legumes. These foods can contribute to excess sulfur in breast milk and may be causing the foul-smelling gas.

Make sure you are staying well-hydrated throughout the day. Drinking plenty of water can help flush out toxins and reduce the concentration of sulfur compounds in your breast milk.

If these dietary changes do not seem to have an effect on your baby’s gas odor, it is always a good idea to consult with your pediatrician. They can provide further guidance and ensure that there are no underlying issues contributing to the problem.

Lactose Intolerance

Lactose intolerance occurs when the body lacks the enzyme lactase, which is needed to break down lactose, a sugar found in milk and dairy products.

When lactose is not properly broken down, it can ferment in the intestines, leading to gas production and foul-smelling stools.

If you suspect lactose intolerance in your baby, it’s important to consult with your pediatrician for an accurate diagnosis.

They may recommend eliminating dairy from your diet if you are breastfeeding or switching to a lactose-free formula if you are using formula. Additionally, they may suggest other dietary changes or provide medication to help manage symptoms.

It’s also worth noting that there could be other reasons for your baby’s gas and foul-smelling stools, such as an imbalance in gut bacteria or certain foods in your diet.


If you suspect that your breastfed baby has lactose intolerance, there are a few steps you can take to alleviate the symptoms.

You may want to try eliminating dairy products from your own diet as breastfeeding mothers pass on what they consume through their breast milk.

You can try offering smaller, more frequent feedings to prevent overloading the baby’s digestive system.

It may also be helpful to burp your baby more frequently during feeding sessions to release any trapped air that could contribute to gas.


Gastroenteritis is an infection that causes inflammation in the stomach and intestines. It can be caused by a viral or bacterial infection, and it commonly leads to symptoms such as diarrhea, vomiting, abdominal pain, and gas.

If you suspect that your baby has gastroenteritis, it’s important to consult with their pediatrician for proper diagnosis and treatment.

In the meantime, make sure to continue breastfeeding your baby as breast milk provides essential nutrients and antibodies that can help fight off infections.

You may want to try some home remedies like giving your baby small sips of electrolyte solution to prevent dehydration or using probiotics to restore healthy gut bacteria.

If you are pregnant and suffering from a cold or cough you can read these Home Remedies For A Cold And Cough During Pregnancy. It will keep your baby safe.


Make sure you are burping your baby frequently during feedings to release any trapped air in their stomach.

Try adjusting your diet if you are breastfeeding. Certain foods like dairy products or cruciferous vegetables can contribute to gas in breastfed babies.

Ensure that you are practicing good hygiene by washing your hands thoroughly before handling your baby and sterilizing any feeding equipment.

Food Allergy

Certain foods that you consume while breastfeeding, such as dairy products, can cause gas and digestive issues in some babies.

It’s worth considering if you’ve recently introduced any new foods into your diet that could be causing this reaction.


The most common culprit for this type of smell is an intolerance to dairy products. If you suspect that your baby has a dairy allergy, it is recommended to eliminate all dairy products from your diet if you are breastfeeding. This includes:

  1. Milk
  2. Cheese
  3. Yogurt
  4. Butter

In addition to eliminating dairy, you may also want to consider eliminating other common allergens from your diet such as soy, wheat, and eggs.

Keep a food diary to track what you eat and any symptoms your baby experiences. This can help identify other potential triggers for the gas and allow you to make necessary adjustments to your diet.

It’s important to note that if you suspect your baby has a food allergy or intolerance, it is best to consult with a pediatrician or lactation consultant for guidance.

They can provide further advice on how to manage the situation and ensure that both you and your baby are getting the proper nutrition.

Breastfed Baby Poop Smells Like Rotten Eggs

Breastfed baby poop has its own unique aroma, and sometimes it can catch you by surprise. One common description that parents often give to the scent of their baby’s stool is that it smells like rotten eggs. While this may sound unpleasant, there’s usually no need to worry.

The smell of breastfed baby poop is mainly influenced by the composition of breast milk. The intake of colostrum during the early days can make the poop yellowish and somewhat odorous.

However, as your baby continues breastfeeding and your mature milk comes in, you may notice a distinct change in smell.

This happens because breast milk contains lactose, which is broken down into lactic acid by bacteria in the gut. The result? A pungent odor akin to rotten eggs.

As disconcerting as it may seem at first, this smell is perfectly normal and indicates a healthy digestive system working as it should.

It’s important to note that any sudden or significant changes in your baby’s poop consistency or odor should still be discussed with a healthcare professional to rule out any underlying issues or possible food intolerances.

Breastfed Baby Gas Smells Like Rotten Eggs

Is It Normal for Breastfed Babies To Have Smelly Gas?

Yes, it is completely normal for breastfed babies to have smelly gas. Breast milk contains a variety of nutrients that can be difficult for a baby’s immature digestive system to break down completely.

As a result, gas can build up in their intestines, leading to smelly flatulence. Breastfeeding babies tend to swallow more air while feeding, which can also contribute to gas and bloating.

There are several positions that can be beneficial in relieving gas in babies.

  1. Tummy Time: Where you place your baby on their stomach while they are awake and supervised. This position helps to put gentle pressure on the abdomen, which can aid in the release of gas.
  2. Cycling: Simply lay your baby on their back and gently move their legs in a cycling motion, as if they were riding a bicycle. This movement helps to stimulate the digestive system and encourages the passing of gas.
  3. Knees to chest: Lay your baby on their back and gently bring their knees up towards their chest, holding them there for a few seconds before releasing. This position helps to relax the abdominal muscles and promotes the expulsion of trapped gas.
  4. Baby wearing: Using a carrier or sling, keep your baby close to you while you go about your daily activities. The gentle movements and pressure from being held against your body can help to soothe your baby’s digestive system and alleviate gas discomfort.

Remember, every baby is different, so it may take some trial and error to find the most effective position for your little one.

Breastfed Baby Smelly Gas, No Poop

There could be a few reasons why your breastfed baby is experiencing smelly gas but no poop.

One possibility is that your baby may be experiencing a temporary imbalance in their gut bacteria. Breast milk contains prebiotics that helps promote the growth of healthy gut bacteria, but sometimes this balance can be disrupted, leading to smelly gas.

Another possibility is that your baby may be sensitive or allergic to something in your diet. Certain foods like dairy, caffeine, or spicy foods can pass through breast milk and cause digestive issues for some babies.

If you suspect this may be the case, try eliminating these foods from your diet one at a time to see if it make a difference in your baby’s symptoms.

When To Be Concerned About Your Baby’s Gas

If your baby experiences any of the following symptoms along with gas, it is crucial to seek immediate medical advice from their pediatrician.

  • Consistently enduring periods of inconsolable crying that persist for a minimum of three hours, happening multiple times per week.
  • Inadequate weight gain or notable weight loss experienced.
  • Frequent mucus or vomit.
  • Fever reaching 100.4 degrees Fahrenheit or surpassing it.
  • Blood is detected in the diaper during diaper changes.
  • A distended or rigid belly that remains unchanged even after passing gas or burping

Related Questions: Breastfed Baby Gas Smells Like Rotten Eggs

Why Is My Baby Not Burping?

There could be a few reasons why your baby is not burping. It’s important to note that not all babies need to burp after feeding. Some babies naturally release gas through other means, such as passing gas or simply swallowing air without needing to burp. If your baby seems comfortable and shows no signs of discomfort or colic, it may be that they just don’t need to burp.

What Color Should Newborn Poop Be?

The color of newborn poop can vary depending on several factors, including what the baby is eating and how their digestive system is functioning. In the first few days after birth, it is normal for a newborn’s poop to be black and sticky, known as meconium. This is because meconium is made up of materials that the baby ingested while in the womb.
After the first few days, the color of newborn poop typically changes to a mustard-yellow, green, or brown shade. The texture may also become grittier as the baby starts to digest breast milk or formula. It’s important to note that variations in color are generally normal as long as there are no other concerning symptoms such as blood or mucus in the stool.
If you have any concerns about your newborn’s poop color or consistency, it’s always best to consult with your pediatrician who can provide personalized advice based on your baby’s specific situation.

Wrapping Up

The odor of rotten eggs can emanate from a breastfed baby’s gas for various reasons. This sulfur-like smell may arise when the mother’s diet contains high levels of sulfur or if there is an allergic reaction to certain foods.

It could also be a result of the baby’s immature digestive system or serve as an indication of underlying issues within their digestive tract.

If you are worried about why your baby’s gas has such an unpleasant odor, it is recommended to consult with your child’s pediatrician for further guidance.

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