Why Do My Baby’s Farts Smell So Bad?

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Taking care of babies is more than simply breastfeeding or playing with them. You need to deal with your baby’s burps, diaper changes, and even farting.

Babies have a lot of gas that they need to release throughout the day. This situation leads to many questions for mothers, especially when they have stinky farts.

So, why do your baby’s farts smell really bad? Is this frequency of farting too much? Don’t worry. This article will help you answer all these questions.

Is It Normal For Babies To Have Stinky Farts?

While this may sound surprising to some, babies can fart. Farting and burping are both the same form of gas.

This gas is very diverse and will have different smells. Depending on what the mother has eaten to pass through the breast milk or what the newborn has eaten, the gas will smell bad or not.

If you’ve been wondering if their stinky fart is normal, check it out. Observe the frequency of air discharge as well as determine its characteristic smell.

Fart is a mixture of many different gasses, and simple carbon dioxide makes up the majority. Some other gasses, such as methane, oxygen, hydrogen, and nitrogen, are odorless.

Only one ingredient is the main contributor to the unpleasant smell, sulfur. Fortunately, it makes up only a tiny part of the mix. The smell of sulfur is similar to that of rotten eggs. Also, the smell of a baby’s farts is often just the effect of the nutritional breakdown of substances in breast milk and formula.

So sometimes you won’t be able to smell anything. It’s completely normal. You should only contact your pediatrician when gas has a highly unpleasant smell, and you can’t find food as the leading cause.

What Causes Baby Farts To Smell Really Bad?

Usually, the fart of a newborn who drinks only formula or breast milk will not have any characteristic scent. The scent of gasses only changes when the baby is given solid food. Below are fart smells and what causes them to your baby.


Sometimes, your baby’s farts smell like sulfur. This chemical can produce an unpleasant rotten egg smell.

When a mother eats fruits and vegetables, sulfur enters her body and infects her breast milk. Some high-sulfur vegetables are kale, broccoli, Brussels sprouts, beans, cauliflower, and spinach.

Don’t worry about consuming these vegetables. Your body will work to remove sulfur through the digestive tract. However, red meat is the richest source of sulfur. The longer it’s left, the more sulfur farts will come.

In addition, other foods that contain sulfur are also high in starch and fiber. If you want to reduce these smelly farts, consider cutting high-sulfur foods out of your diet.

my baby's fart smells really bad

Sour Milk

If you smell sour milk when your baby farts, chances are your newborn has lactose intolerance. Another possible condition is that the lactose builds up too quickly, beyond what the baby’s body can digest. This also happens when the baby starts drinking whole milk.

Compared with hindmilk, the foremilk in breast milk contains higher sugar content. This excess sugar is the leading cause of an excess of lactose.

Lactose can also accumulate in breast milk if the milk is not fully expressed. So, you should always empty one breast completely before switching to the other breast. This phenomenon is one of the main culprits that make newborn farts smell bad.

In case your baby cannot digest lactose, you consider getting advice from your pediatrician. They can suggest healthy lactose-free formulas for your newborn.

Iron and Metal

If your baby’s diet is high in iron, their fart will likely have a strong metallic smell. More than that, this strange and foul-smelling gas would even be a telltale sign of more serious medical problems.

The frequency of farting in an infant is 13 to 21 times per day, equivalent to a full adult’s. So, if farting is too much and the smell is stinky, then your baby has several problems.

The first problem is caused by the baby’s poor ability to absorb nutrients. Otherwise, the body may have an infection.

In some cases, your baby may experience cramping or pain. If you notice the above signs, do tests to check your baby’s health and get advice from your pediatrician.

Rotten Eggs

Baby gas that smells like rotten eggs is similar to gas that smells like sulfur. The main culprit for this smell in babies is breast milk. Besides, some other foods, such as eggs, also affected the nursing mother and breastfed baby.

Since the smell of rotten eggs is similar to sulfur, eating foods rich in sulfur and fiber will have the same effect. You can double-check your diet to identify foods that may be causing these smelly farts.


One of the most effective methods of determining the reason for your baby’s farting is to find out what food the scent reminds you of.

Like cauliflower and broccoli, cabbage is another cruciferous vegetable that affects newborns and makes their fart smelly. So, if your baby’s fart smells like cabbage, think back to your previous meal.

You can also apply this method to babies who have started eating solid foods. The diet and food consumed daily can affect the gas released from their bodies.

help gassy baby poop

How To Help A Gassy Baby Poop?

A lot of parents run into a situation when a newborn expels a large amount of stinky gas. However, they don’t poop.

The bowel movements of newborns are not fixed and scheduled. So it won’t be a big deal if they don’t poop now and then. However, if your newborn has frequent bloating but still has difficulty passing the stool, it shows health problems.


When a baby is constipated, the abdomen will swell and cause it to push harder while pooping. This cramping and bloating will make your baby uncomfortable and cry more often.

Experiencing constipation can cause a newborn to have a specific and irregular stool pattern. The texture of the waste can be pasty, soft, and liquid or as hard and small as an end rock.

In other cases, loose stools are accompanied by solids to prevent bowel movements. More seriously, the consistency of the waste is similar to clay and contains traces of blood.

The main symptoms of constipation in children are anorexia and bloating. Babies also often fart with a bad smell. Constipation and bloating can also be normal as newborns gradually learn to digest and move their bowels.

The most reasonable solution is to add fiber or broth to the diet. In addition, you can massage the abdomen to help your child feel more comfortable.

Hard-To-Digest Food

Babies who are just starting to get used to a solid food diet may also experience constipation. They regularly release stinky gas but don’t poop.

The main cause of this problem is that the digestive system is immature and not yet fully developed to digest food properly.

Oat cereal will be a better choice for such children than rice cereal. This type of food is much easier to digest. It would help if you also considered adding fruit juices such as apple and pear juice to your daily meals.

Unless you’ve talked to your doctor, limit your use of laxatives. All the smelly gas will disappear when the newborn can poop normally again.


If you still have questions regarding the baby’s farts, please explore them below.

Does Gassy Mom Mean Gassy Baby?

No. Although many mothers frequently worry that their diet and gas will increase bloating in their babies, this belief is wrong.

There is not much scientific research presented on the possibility that foods consumed by mothers cause intestinal problems in newborns.

Some babies may react to certain choices in their mother’s diet. However, it does not mean a specific list of foods to avoid while nursing.

Instead, vomiting while feeding may be the cause of bloating. It occurs when the discharge reflex is so strong that the newborn has to swallow milk to keep it. At the same time, your child will ingest more air.

How Many Times Should A Baby Fart A Day?

Newborns can be very gassy. They fart an average of 13 to 21 times a day. This phenomenon is entirely normal when the digestive system of a newborn baby is still weak and not mature. However, if grimaces accompany them, frowns, irritability or crying, it could be a sign of health problems. You should consider contacting your pediatrician.

When Should You Worry About Baby Gas?

If your baby’s fart is getting heavier than usual, your baby is struggling with gas in the stomach. The smell of fart is also a noticeable warning of severe health problems. It could signify that the body is lactose intolerant or has an infection.

The best thing you can do during this time is to observe your newborn and make sure they are not upset by the gas. If your baby shows signs of pain or cramps, contact your doctor immediately to find the right solution.


There are many causes why your baby’s fart smells so bad, such as the high-sulfur content in breast milk or because the baby is lactose intolerant. This issue is not serious if it only occurs occasionally. Yet, you need to contact the doctor if your child shows signs of pain and constipation. As long as you maintain a healthy and easy-to-digest diet, your newborn will be healthy and no longer gassing stinky farts.

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