Natural Baby Life logo (480 x 130)
White Curds in Baby Poop (3 Possible Causes!)

White Curds in Baby Poop? (3 Possible Causes!)


Disclosure: Some of our articles contain links to recommended products or services in which we may receive a commission if you make a purchase.

As a new parent, it can be hard to know what’s normal and what’s not, especially when it comes to baby poop. Many parents are alarmed to open a diaper and find white curds inside, but you might wonder are white curbs in baby poop normal? What’s causing this odd texture?

White curds or chunks in baby poop are typically bits of undigested milk fat and are normal for breastfeeding babies. For formula-fed babies and toddlers, white curds could be the result of illness, undigested food, or a food allergy or intolerance. Completely white poop could be a sign of a serious medical issue.

Is your baby’s poop normal? Let’s look at some of the possible causes of the white curds in baby poop.

Mother changes baby's diaper on bed

White curds in baby poop

Your baby’s poop is likely to go through the entire color spectrum at one point or another. Breastmilk, formula, and solid foods can all lead to different colors and textures for your baby’s poop that can sometimes look startling but are often completely normal.

If you notice a white curd in baby poop, don’t panic. White curds in baby poop are most likely normal, especially if you are breastfeeding. However, they could also indicate an issue in some cases.

It’s common for the fats in undigested breastmilk (and regular milk or foods) to clump together and form white curds in baby’s stool. But for all babies, a new change in poop consistency could signal an illness or an allergy so you should be aware of all of the possibilities.

No matter how you feed your baby, white curds in baby poop generally have three possible causes:

  • Undigested fat
  • Undigested food
  • Illness or infection

With that in mind, let’s take a look at what you should expect depending on what your baby is eating:

Breastfed babies

With breastfed babies, it’s normal for baby poop to look like it has cottage cheese curds in it because of the way the milk proteins make their way through your baby’s developing digestive system. In this case, you are likely to see white curds or pieces mixed into a yellowish, watery stool.

Formula-fed babies

White curds or chunks in formula-fed baby poop can still be normal, or they could mean your little one is reacting to an ingredient in the formula, usually a dairy allergy. In this case, monitor your baby for other signs of allergic reaction and consult a doctor if your baby has other symptoms. Your baby’s poop is also likely to change if you change formula brands or types.

Older babies and toddlers

Once babies are eating solids, white curds could be caused by undigested food, an infection, or a reaction to a new food. If there don’t seem to be any other issues happening with your baby, it’s probably normal. If they have other symptoms such as fever, diarrhea, or vomiting, seek medical attention immediately.

In all cases,  it’s important to be cautious so you should never feel bad about calling your pediatrician to ask their opinion, just in case.

What does white chunks in baby poop mean?

At this point, we’ve explained what causes white chunks or curds in your baby’s poop.

But, what do you do now?

If your baby is breastfeeding, you don’t need to change anything as long as they have enough wet and dirty diapers each day and are gaining weight normally – your baby’s digestive system will continue to develop!

If your baby is formula-fed, you may want to change to a different brand of formula that does not include lactose.

However, it’s always a good idea to talk to your child’s pediatrician before switching formula. Additionally, if you suspect a dietary intolerance or allergy, always consult with a doctor!

Now, let’s take a closer look at what might be happening with babies and toddlers.

Woman breastfeeding her baby while sitting on a couch

White curds in breastfed baby poop

The most common reason for white curds in poop is that your baby is breastfed.

The poop of a breastfed baby is often described as mustard-colored and seedy. Parents say it looks like cottage cheese or that it’s runny and has white curds in it.

If you have an exclusively breastfed baby and this description matches what you are seeing – congratulations! Your baby’s poop is super normal. The curds you see are likely undigested milk fat, and they are to be expected. Every poop will look about the same in this case.

If you are seeing something that looks more like mucus (think snot), or flecks of red blood, it could mean that your baby has an infection or an intolerance to a food you are eating – check with your pediatrician in this case.

Many newborns are intolerant to dairy milk proteins that are passed through the breastmilk. You may notice changes in baby’s poop depending on what you ate recently, which points to an intolerance or allergy.

Your pediatrician can help find the cause and plan next steps. 

Once your baby starts eating solids, or if you introduce formula, you’ll see changes in the poop again. 

White curds in baby poop when formula-fed

For babies who are partially or completely formula-fed, poop will look different than that of a breastfed baby. You may still see white curds though. 

There can still be pieces of undigested milk fat like in breastfed poop, but because formula digests differently than breast milk, this poop is usually darker in color and more solid. Because of this, you may not still be able to see those white chunks of undigested milk.

White curds in the poop of a formula-fed baby could also be a sign of a food allergy or intolerance, especially if you are noticing other signs like diarrhea, fussiness, or mucus in the poop. A sudden change in poop can also mean your baby is fighting an illness. If this started suddenly or after starting a new formula, you should check in with your doctor.

Keep in mind though, if you are combination feeding with breastmilk and formula, those white curds are probably just a normal effect of breast milk. Some parents notice more variety in their baby’s poop depending on which kind of milk they recently had.

Toddler jumping on bed in diaper

White curds in toddler poop

When it comes to feeding patterns, solid foods, and digestion, toddlers are a whole different ball game, but if you have one you already know that!

Some possible causes of white curds in toddler poop could be:

  • A milk-heavy diet, which sometimes happens when a toddler is sick or teething and doesn’t eat as much solid food as usual. It’s not unusual for a toddler’s poop to revert back to a more baby-like consistency in this case. This is especially true if your toddler is still breastfeeding and increases their nursing time while ill. 
  • A food allergy or intolerance, especially if the curds come with diarrhea with stringy globs of mucus in it. If you suspect a food allergy or intolerance, talk with your child’s pediatrician.
  • A virus or an infection. In this case, you will likely see other symptoms, depending on the type of infection.

Undigested food is most likely to be the culprit if you are seeing white curds in your toddler’s poop. Another clue that this is the case is if you only notice it once or twice, or only after your toddler eats certain foods. 

What does undigested food look like in baby poop?

When your baby starts solids, you will see a big change in the color, consistency, and (definitely!) smell of the poop.

As their bodies adjust to solid food, you will sometimes see entire pieces of food in the poop as well. This is completely normal! It takes a while for a baby’s digestive system to fully process solid foods at first. As they eat more and learn to chew more completely, their poop will start looking a lot more like, well, poop.

If your little one just started solids and you are suddenly noticing white curds, look to diet as the first possible cause. That cottage cheese looking substance could quite literally be the cottage cheese they ate earlier! Even things like pasta, rice, potatoes, etc., could give a white-ish or chunky appearance.

You might be surprised by the way food looks once it shows up partially digested in the diaper. A snack like colorful cereal or crackers could easily end up looking like white chunks after a trip through your baby.

Even in toddlerhood, undigested food in poop is not uncommon. (It’s even normal for adults!) Some fibrous foods like corn or peas are more likely to be seen again, but literally anything can show up in the poop. Babies and toddlers digest food quickly and they have less than great chewing skills, so it’s easy for food to pass all the way through relatively unharmed. 

As long as your child doesn’t show other signs of a problem such as slow growth, tiredness, persistent diarrhea – there’s no need to worry. 

What if my baby’s poop is totally white?

If your baby’s poop is completely white, call your doctor!

Poop that is completely white, chalky looking, or very pale is a different story – talk to your pediatrician ASAP if you see this. It’s rare, but it can indicate an issue with the way the liver is processing bile

Note: if your baby or toddler recently had a stomach bug, you might notice one or two pale poops in the day or two after your child starts feeling better. This can be normal, but check in with the doctor just to be on the safe side.

What does infected baby poop look like?

If you are worried that your baby might have an infection or other issue going on, don’t worry. White chunks or curds in your baby’s poop does not always indicate an infection.

If your baby’s poop is infected, it will often have a green color to it and there might even be some blood mixed into the stool. This could be bright red, dull red, or even black depending on how long it has been in the stomach and intestines.

What does teething poop look like?

Teething babies won’t necessarily have a change in poop color but they can experience something known as ‘teething diarrhea’ in which their stools are loose and they may experience general stomach upset, as well.

The term ‘teething diarrhea’ is a bit of a misnomer, however, because the diarrhea isn’t caused by the teething itself. Rather, teething tends to happen around the same time that babies are starting to eat solid foods. When a baby reaches this milestone, there are LOTS of poop changes happening as his or her stomach gets used to the new foods!

Other possible baby poop colors

White curds can be normal in baby poop, but what about other strange colors? Here’s a quick look at some of the other possible baby poop colors and what they might mean:

  • Yellow
    Yellow poop is incredibly common, especially for breastfed infants. If this is their normal poop color and there aren’t any concerns, this indicates a healthy digestive system.
  • Brown
    Brown poop is also an indication of a healthy digestive system, whether your baby is breastfed or formula-fed.
  • Green
    Green might be the color of your baby’s poop when they’re a newborn as they transition from meconium to regular newborn poop. It also might be caused by them digesting green foods, either from eating solids or from your breastmilk. In some cases, it could indicate they’re not feeling well, but you will typically notice other symptoms as well.
  • Red
    Red poop or streaks of red in your baby’s poop could indicate something is wrong. It could be a food allergy causing distress or some kind of irritation from being sick. There’s a possibility it’s normal or the red came from food dye. However, if you think there’s any amount of blood in your baby’s poop, check in with their doctor.
  • White
    White poop, although rare, can indicate that there’s a problem with your baby’s live. If your baby’s poop is completely white, you should seek medical attention right away.
  • Black
    Meconium, which is a baby’s first poop after birth, is typically black and looks sort of like tar. If your baby isn’t a newborn, black poop could be caused by something your child ate or a medication. In some cases, it could be caused by bleeding in the intestines, but they usually have other serious symptoms in this case. If you’re unsure, talk to your child’s pediatrician.
  • Bright green
    If your child’s poop is bright green, or another strange color, like blue, it’s most likely caused by something they ate. Especially when your child eats food dyes, you’ll see the color come out in their poop. If it is caused by food, the color should be temporary and their poop will return to normal soon.

Frequently Asked Questions (FAQs)

Why does my baby’s poop look like cottage cheese?

Baby poop with a cottage cheese consistency is usually normal, especially for breastfed babies. You will also notice what looks like little seeds in breast-fed baby poop, which is also normal.

What does milk allergy baby poop look like?

If your baby has a milk allergy, you may notice their poop is slimy and loose. It may even contain blood. If you are concerned your baby has a milk allergy, it’s best to talk to your pediatrician.

What is the white film in baby poop?

White specks or white curds in baby poop is typically normal and may be caused by undigested milk fat or undigested food. In some cases, it can indicate an infection, but you will likely notice other symptoms.

What does dehydrated baby poop look like?

If your baby is dehydrated, you’ll likely notice that their poop is dry and hard. This may come after they’ve gotten sick with diarrhea. If you notice stools that are dry and hard, make sure your baby is getting enough breastmilk or formula.


It’s not uncommon for new parents to consistently ask: is my baby’s poop normal? One of the causes for concern is white curds in baby poop. In most cases, there’s no reason to panic since it’s likely due to undigested milk-fat or undigested food. Sometimes it can indicate an infection or allergy, but you’ll usually see other symptoms as well.

Joshua Bartlett
Joshua Bartlett

My name is Joshua Bartlett I run this blog with my wife Jarah. We have more than 11 years of parenting experience including three girls and one boy. I started this blog in late 2018 when I realized that I was dealing with baby-related issues on a constant basis…please read more about me here!