Why Does My Breastfed Baby Poop Smell Like Rotten Eggs?

If your breastfed baby poop smells like rotten eggs, don’t worry – you’re not alone. This is a common problem for newborns, and there are a few things you can do to help.

Why does my breastfed baby poop smell like rotten eggs?

It’s no secret that newborns can have some pretty intense stench issues. Whether it’s their breath, body odor, or poo, it can be pretty overwhelming.

And it’s not just breast milk or formula that they’re ingesting that’s causing the problem. There are a few other things that can contribute to a newborn’s stench.

For one thing, their digestive system is still developing, so they may not be able to break down certain foods as well as an adult can. This can lead to smelly gas and bloating, which can make them smell pretty bad.

Additionally, newborns tend to have a lot of mucus in their nose and throat, which can also add to the stench. Thankfully, there are a few things you can do to help manage a newborn’s stench.

Regular baths and using mild soap can help get rid of some of the bacteria that cause odor. You can also try using a diaper rash cream to help keep their skin clean and dry.

And last but not least, make sure you’re changing their diapers frequently to help prevent any build-up of smelly urine or poop.

Smelly poop in breastfed babies

When your breastfed infant has feces that smells like rotten eggs, you’re probably concerned.

Finally, breast milk is derived from you, so something in your diet may be to blame. Many foods can produce rotten eggs or sulfur-smelling gas, including:

  • Dairy
  • Eggs
  • Broccoli
  • Cabbage

If your baby is suffering from foul-smelling gas, it’s important to figure out the cause. In some cases, dietary changes can make a big difference. If you suspect that sulfur-rich foods are the culprit, try removing them from your diet to see if it helps.

Sulfur is found in many healthy foods, including eggs, broccoli, and Brussels sprouts, so it’s not necessary to eliminate all sulfur-containing foods. Just remove a few items at a time and see if there’s a noticeable difference in your baby’s gas. If the odor persists, talk to your pediatrician.

There could be another underlying cause that needs to be addressed. In the meantime, try burping your baby often during feedings and avoid letting him or her eat too much at once. These simple steps can help reduce the amount of gas your baby produces.

Smelly poop in formula-fed babies

If you notice that your baby’s farts have started to smell like sulfur, there’s no need to worry. In most cases, it simply means that he or she is having difficulty digesting the formula.

This can happen for a number of reasons, including intolerance to lactose or a sensitivity to the product you’re using. If you’re unsure what might be causing the problem, be sure to check the label of the formula for any potential allergens.

In some cases, a change in diet may be all that’s needed to help your baby feel better and reduce the unpleasant odor. However, if you notice that your child is also experiencing other symptoms such as green feces, it’s best to speak with his or her doctor.

They will be able to recommend the best course of action and help you find a formula that agrees with your baby’s stomach.

Finding the cause for stinky gas

It all comes back to what a baby eats when your baby passes gas and it smells like rotten eggs. Whether they’re fed with formula or breast milk, the same is true – what they eat affects the odor and causes their gas to smell like rotten eggs. To discover the causes of stinky gas, look at what your infant or what the breastfeeding mother eats.

breastfed baby poop smells like rotten eggs

Why & what to do when breastfed baby gas smells like rotten eggs

When a breastfed baby gas smells like rotten eggs, it can be concerning. After all, you want your little one to be healthy and happy. However, there’s no need to worry: in most cases, the rotten egg smell is simply due to what you have eaten and is passed through your breast milk.

If you’re breastfeeding, the culprit is likely to be something you’ve eaten. Common offenders that cause smelly gas include cabbage, broccoli, beans, and onions.

Keep a food diary to help you identify any gas-producing foods. Once you’ve pinpointed the problem, you can make some simple changes to your diet. In most cases, smelly gas will quickly become a thing of the past.

Formula-fed babies

For formula-fed babies, the cause is usually the formula itself. Many formulas contain Cow’s milk protein, which is difficult for some babies to digest. As a result, Cow’s milk protein can cause baby gas smells like rotten eggs.

The baby’s digestive system is still immature

As any parent knows, a newborn’s stomach and digestive system are still developing, so he or she may experience some discomfort. Gas levels vary from baby to baby; some have normal amounts while others have sensitive stomachs and require longer to adjust.

However, there are a few things you can do to help your baby feel more comfortable.

First, make sure you burp your baby after each feeding. This will help to release any air bubbles that may be causing discomfort.

Second, try to keep your baby upright for at least 30 minutes after eating; this will help to prevent reflux.

Finally, if your baby is having trouble passing gas, you can try gently massaging his or her tummy in a clockwise direction.

By taking these simple steps, you can help your baby adjust to life outside the womb and avoid any unnecessary discomfort.

Swallowing air when feeding

It’s important to burp your baby frequently, especially after they eat. If you don’t, the surplus gas will have to come out somehow, and it can come out through their bottom.

Pay close attention to how you’re feeding your child. Some positions might result in your infant taking too much air, while other bottles may not have enough vents to push out the air bubbles if you’re bottle-feeding.

You might need to experiment a bit to find what works best for your baby. But it’s worth it to avoid those dreaded gas pains!

Food Sensitivities

When you breastfeed your baby, you are providing them with the perfect source of nutrition. However, what you eat can also have an impact on your baby.

If you consume certain foods that are known to cause gas, your baby may end up being gassy as well. Dairy, Brussels sprouts, beans, broccoli, cabbage, and caffeine are all common gas-causing foods.

If you notice that your baby is particularly gassy after you have eaten any of these foods, it may be best to avoid them in the future. By being aware of which foods may cause gas, you can help to ensure that your baby stays happy and comfortable.


Constipation affects everyone at some point. While constipation is more prevalent in formula-fed infants, it strikes all newborns. If your infant has a lot of gas, it could be due to constipation, so keep an eye on their bowel movements and/or absence thereof.

If your baby is straining or seems to be in pain when trying to pass a stool, this is also a sign of constipation. Another common symptom is hard, dry stools.

If you notice any of these signs, you can try giving your baby a little extra water or apple juice (for babies over 6 months old) to help soften the stool. You can also try gently massaging their tummy in a clockwise direction or giving them a warm bath. If constipation persists, talk to your doctor about other possible treatments.

Excessive Crying

When a baby cries, it can be frustrating for both the baby and the caregivers. While crying is a normal part of infancy, frequent or excessive crying can be a sign of discomfort or illness.

Gas and indigestion are common causes of belly pain in babies, and crying can sometimes make these symptoms worse. When a baby cries, they take in more air, which can lead to gassiness and bloating.

This can cause them even more discomfort, resulting in a vicious cycle of crying and discomfort.

However, there are ways to help soothe a crying baby and ease their discomfort. a gentle massage or warm compress can help to ease stomach pain, and rocking or lullabies can help to calm a baby’s nervous system. With a little patience and care, most babies will soon be back to their happy selves.


As a parent, you always want what’s best for your child. So when your little one has been prescribed medication, it’s important to follow the doctor’s instructions carefully.

However, you may not be aware that some medications can cause excess gas in babies. If your child is taking medicine, be sure to monitor their gas levels and discuss any concerns with your doctor. In some cases, changing the dosage or switching to a different medication may be necessary.

Additionally, if you are breastfeeding, be aware that anything you consume can affect your child. Certain foods and supplements can lead to excess gas, so it’s important to pay attention to your diet. By being mindful of these potential causes, you can help ensure that your child stays happy and comfortable.


It may come as a surprise to learn that babies experience stress, just like adults do. In fact, studies have shown that babies as young as six months old can show signs of anxiety and stress.

While it’s impossible to know exactly what’s going on in their little minds, it’s clear that they are smart enough to pick up on the cues around them. If their parents are constantly arguing or seem frazzled, it’s likely that the baby will start to feel stressed out as well.

This can lead to digestive issues, so it’s important to try to create a calm environment for your baby. Spend some time relaxing with them each day, and take care to avoid anything that might cause them undue stress. By doing so, you’ll help your baby to stay healthy and happy.

What Causes a Baby to Have Smelly Gas but No Poop?

If your baby’s gas has an unpleasant odor but no feces, you may be concerned that there is something wrong. However, it’s not unusual for this to happen.

Because babies don’t have a set schedule for bowel movements, if they experience gas but don’t poop, don’t be alarmed unless something else seems to be wrong. In most cases, the gas is simply a result of your baby’s digestive system adjusting to new foods.

If your baby is otherwise happy and healthy, there’s no need to worry. However, if you notice other changes in your baby’s behavior or health, it’s always best to consult with a doctor. Trust your instincts and you’ll be sure to provide the best care for your little one.

breastfed baby poop smells like rotten eggs

Signs of constipation

Any parent knows that dealing with a constipated baby can be a frustrating experience. Not only is it uncomfortable for your little one, but it can also be challenging to figure out what the best course of action is.

If you suspect that your baby is constipated, it’s important to keep an eye out for certain symptoms. For example, hard stools and stools that have streaks of blood are both signs that something is wrong.

Additionally, if your baby hasn’t pooped within five days or seems to be in pain when trying to poop, he or she may be constipated. If you notice any of these symptoms, talk to your pediatrician about the best way to proceed.

In the meantime, try to encourage your baby to eat normally and drink plenty of fluids. And remember, this is just a temporary problem – soon enough, everything will be back to normal.

Final thoughts

Breastfeeding is a wonderful experience for both mom and baby, but it can sometimes be challenging to figure out what’s going on when your baby has gas that smells like rotten eggs. In most cases, this is simply the result of your baby adjusting to new foods through your breast milk.

If you’re concerned about your baby’s health or if the gas is accompanied by other changes in behavior, it’s always best to consult with a doctor. However, in most cases, there’s no need to worry. Just keep an eye on your baby and trust your instincts – everything will be just fine.

About the author

Lacy Reason is a highly experienced and compassionate lactation counselor, who has dedicated her career to educating and supporting new mothers on their breastfeeding journey.

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