Baby Poop Smells Like Yogurt – Is It Normal & When To Worry?

Parenthood is a remarkable journey filled with countless moments of joy but brings many unexpected surprises.

One such puzzling moment you might encounter is when you notice that your baby poop smells like yogurt.

While many peculiarities can be chalked up to the quirks of infancy, it’s essential to be aware that this particular scenario might not always fall into the category of “normal.” 

Therefore, understanding the reasons behind the yogurt-like scent in your baby’s poop can help you navigate parenthood with confidence and ensure the well-being of your precious little one.

5 Reasons Why Baby Poop Smells Like Yogurt 

baby poop smells like yogurt

The nutrients from your breast milk can make  your baby’s poop give off a yogurt-like smell, which is normal.

But this phenomenon can also result from lactose intolerance, digestive issues, intestinal bacteria, or infections.

Dietary Factors

The composition of a baby’s diet plays a pivotal role in the scent of their poop.

If your child is exclusively breastfed, their stool may carry a slightly sweet smell akin to the fragrance of breast milk.

This natural scent results from the nutrients and components in breast milk, and it’s generally considered normal.

However, their poop’s odor can change significantly as your baby transitions to solid foods.

Certain baby foods like dairy products like yogurt and cheese can impart a yogurt or vinegar scent to newborn poop.

This is particularly noticeable if your kid consumes dairy as part of their diet.

Lactose Intolerance

Symptoms of lactose intolerance, though uncommon in infants, are another potential reason why your baby poop smells like sour yogurt.

Lactose is the sugar found in milk; some babies may have difficulty digesting it. When lactose stays undigested in the gut, it can ferment and produce sour-smelling poops.

This odor may resemble yogurt due to the breakdown of lactose into specific compounds.

Stomach Issue

Digestive disturbances and stomach issues can significantly impact 2 month old poop smells.

When the digestive process encounters disruptions or inefficiencies, it can lead to changes in the scent of normal poop, sometimes resulting in a yogurt-like aroma.

Various factors can trigger these disturbances, including allergies, sensitivities, or gastrointestinal discomfort.

It’s important to monitor your toddler for signs of digestive distress, such as excessive gas, bloating, or fussiness, which can accompany these issues.

Bacteria in Intestine

The presence of beneficial bacteria in your toddler’s intestines can also play a significant role when a breastfed baby poop smells sour.

Probiotics, beneficial microorganisms or the natural gut flora, can influence the odor of breastfed poop as they break down food in the digestive tract.

Sometimes, these bacterial infections can produce compounds that give off a bit of yogurt-like scent.

While this is generally harmless, it’s essential to maintain a balanced and healthy gut environment for your child.

Breastfeeding and introducing appropriate solid foods can support the development of beneficial gut bacteria, positively impacting your breastfed babies’ overall health.


Infections, although relatively rare, can explain why a newborn poop smells sour.

When a disease affects your toddler’s gastrointestinal system, it can lead to changes in the odor and consistency of their stool.

Suppose you notice that newborn stool has a persistent distinct smell and is accompanied by concerning signs such as diarrhea, fever, vomiting, or changes in behavior.

In that case, it’s essential to seek immediate medical attention.

Parasitic infections can range from viral illness to bacterial imbalance, and early detection and treatment are crucial to ensure a swift recovery.

When Should You Worry About Baby Poop Smell? 

When Should You Worry About Baby Poop Smell 

Here’s a guide on when you should worry about formula-fed baby poop smells sour:

  • Sudden and Severe Change in Smell: If your kid’s poop odor suddenly becomes extremely foul, offensive, or significantly different from what you’ve previously experienced, it could be a sign of a gastrointestinal issue or infection.

When your little one has smelly gas but no poop, you should also track the root cause for proper treatment.

  • Consistent, Persistent Unpleasant Odor: A sign of illness may be present if your toddler’s excrement continually has an unpleasant or strange odor for an extended period.
  • Blood in the Stool: You should be quite concerned if there is a reddish hue or bloody stool. Any number of abdominal symptoms, such as allergic reactions, gastrointestinal bleeding, or infections, could be indicated by this.
  • Diarrhea or Watery Stools: Frequent, watery, or diarrhea-like stools come with a distinct and often strong smell. If your baby experiences persistent diarrhea, it can lead to dehydration and requires medical attention.
  • Signs of Dehydration: It’s a symptom of dehydration if you notice your baby has fewer dirty diapers than normal, seems lethargic, or has a sunken fontanelle (a soft place on the baby’s head) accompanied by a strange feces odor.
  • Fever and Other Symptoms: A combination of unusual poop smell, fever, vomiting, abdominal pain, or changes in behavior, such as excessive crying, can indicate an infection or other medical condition.
  • Lack of Weight Gain: Investigate any underlying digestive or nutritional problems if your child’s feces odor is accompanied by indicators of poor growth or inability to gain weight.

What Should I Do If My Baby’s Poop Smells Like Yogurt? 

What Should I Do If My Baby’s Poop Smells Like Yogurt 

If your baby’s poop smells like yogurt, here’s what to do:

  • Monitor Symptoms: Pay close attention to any other unusual symptoms or discomfort in my baby.
  • Review Diet: Consider their diet, as certain foods can influence poop odor.
  • Consult a Pediatrician: If you’re worried or if the smell persists with concerning symptoms, contact your pediatrician for guidance and assessment.
  • Maintain Hydration: Ensure your baby stays hydrated with breast milk or formula.

In most cases, it’s a benign variation.

However, it’s always wise to consult a healthcare professional for guidance and peace of mind as you navigate the nuances of your baby’s health and well-being.


It’s essential to remember that when baby poop smells like yogurt, it is not considered normal in most cases.

This unusual odor can sometimes indicate an underlying health issue that requires attention and evaluation by a healthcare professional.

Ultimately, your child’s health and well-being are paramount, and any concerning changes in their poop, including an unexpected yogurt-like smell, should prompt you to seek advice from your pediatrician.

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