12 Types of Baby Poop and What They Mean

There may never be another time in your life when you spend so much time thinking about poop. New parents quickly learn that every diaper change can bring new questions about what’s normal, what’s not, and whether a certain color or texture should be concerning.¹

The good news is that baby poop changes frequently during the first year of life, and many variations are completely normal. Here’s what different types of baby poop can look like, what they often mean, and when it’s a good idea to contact your pediatrician.

Baby Poop Colors, Textures, and What They Mean

1. Meconium: Your Baby’s First Poop

Congrats, new parent! This is the first poop your baby will ever have. Meconium is a sterile, thick, tarry, black-green, odorless poop.^2,3,4 It’s the result of everything your baby’s gastrointestinal tract accumulated in utero, including mucus and bile.^2,4 It usually occurs within 24-48 hours after delivery.^1,2 Black, tarry meconium is expected in the first few days. Once your baby’s stools have changed to other colors, black stool should be checked by their pediatrician.^5,6

Babies can also pass meconium before or during delivery. If they breathe meconium-containing fluid into their lungs, it can cause meconium aspiration syndrome (MAS), which requires treatment.^7,8

2. Breastfed Baby Poop

Breastfed newborns commonly have loose, runny stools and may poop frequently.^9,10 Sometimes, newborns poop with every feed, which can be up to 10 times per day!¹¹ It’s also commonly yellow and seedy. Yellow, green, brown, and orange shades can be normal. It can also have a sweet odor.^10,12,13

3. Formula-Fed Baby Poop

Formula-fed baby poop tends to be thicker than breastmilk poop. It’s often greener or browner and slightly darker than breastmilk poop. The consistency is similar to peanut butter.^11,14 Yellow, green, brown, and orange shades can be normal.^11,13

4. Transitional Poop in the First Few Days

This is something between the thick dark meconium and the softer stools from breast milk or formula.¹³ Many newborns lose some weight in the first few days. Their pediatrician checks weight alongside feeding, wet diapers, and stools; weight loss greater than 10% of birth weight needs further evaluation.^15,16

As milk intake increases, stools change from dark meconium toward the softer stools associated with breast milk or formula.^13,15 Many babies regain their birth weight within 7 to 14 days.¹⁵

Related: How Much Weight Loss Is Normal for a Newborn

5. Baby Poop After Starting Solids

Once your baby starts eating solid food (and isn’t just drinking breast milk or formula), their stool will drastically change. It becomes smellier and thicker, trending more toward the poop of an adult.

The color also changes and often reflects the color of the foods they ingest. Foods like blueberries, carrots, spinach, and beets can dramatically change stool color. You can even see pieces of undigested food in the poop.^11,13 This often surprises new parents, but it’s completely normal!

6. Baby Diarrhea: How to Recognize It

Parents often have difficulty defining diarrhea for a baby, especially in the early days when every poop looks like what you’d call diarrhea for an adult. The key indicator for diarrhea is a change in your baby’s regular stool pattern. A sudden increase in how often your baby poops and how watery the stools are can suggest diarrhea. One unusually loose stool does not necessarily mean your baby has diarrhea.^10,11 The problem with having a newborn is that you don’t know what “normal” is yet.

Diarrhea can result from an infection, certain medications, or a food allergy or intolerance.^6,10 Teething does not cause diarrhea, so don’t assume new watery stools are just part of cutting a tooth.³³ If you’re unsure whether your baby has diarrhea, contact their pediatrician.

Call your pediatrician right away if your baby is 3 months old or younger and has diarrhea. Also call promptly if diarrhea comes with blood, poor feeding, fewer wet diapers, a dry mouth, or unusual sleepiness. A rectal temperature of 100.4°F (38°C) or higher in a baby younger than 3 months needs immediate medical attention.^10,34

Related: How to Take a Baby’s Temperature

7. Constipation: Hard, Dry Poop

Constipation is when your baby has hard stools. Poop that resembles small, rabbit-like pellets, hard logs, or marbles typically indicates constipation.¹² How often your baby poops also needs to be considered alongside their age and feeding.¹⁸

If your baby grunts, squirms, or turns red when pooping, that doesn’t necessarily mean they’re constipated. Pooping is a complex series of events that one has to get used to! It requires contracting specific muscles while relaxing others. And your baby has to do it all while lying on their back!

After the first month, some breastfed babies may go several days between soft stools. During the first month, however, infrequent stools can mean a baby is not getting enough milk.¹⁷ Ask your pediatrician about hard stools or a change in your baby’s pattern. What helps depends on your baby’s age and feeding, so check before adding water, juice, or other constipation remedies.¹⁸

Related: Baby Constipation Remedies: How To Help a Newborn Poop

8. Mustardy Yellow Poop

Whether it’s reminiscent of Grey Poupon, a typical chef’s mustard like Maille with the grainy, seedy texture, or the classic French’s yellow mustard, any mustardy poop is common for breastfed babies.¹³ If this is the stage you’re in, it’s understandable that you’ll be putting ketchup on your hot dog for a while!

9. Green Poop

Green baby poop is one of the most common diaper changes that worries parents, but it is often completely normal.¹⁹ If your baby is happy and growing fine, it’s usually nothing to worry about.

Dark green poop can come from pigment in foods like spinach and other vegetables, or from iron supplements.^12,20 Bright green poop may mean food moved through the intestines more quickly than usual.²¹

In breastfed babies, green stools are sometimes associated with feeding patterns or an oversupply of milk, but color alone does not show that a baby is getting too little milk fat.^22,23

If your baby is otherwise doing well, this typically isn’t a concern.^23,24 However, if your baby isn’t growing well or seems unwell, it’s a good idea to check in with your doctor, as green poop can sometimes signal infection or another issue.²⁴

If your baby’s poop is consistently green and contains mucus, looking similar to nasal mucus in the diaper, you should call your pediatrician. This can indicate a milk protein intolerance or another underlying issue.²⁵

One other common cause of bright green poop is food dye.²⁰ And not just green dye, either. A birthday cake with blue and yellow frosting can result in surprisingly bright green stools.

10. Red Poop

Red poop can look alarming, but the cause is not always serious.

If your baby has bright red poop, you should definitely check with the doctor.¹ Red stool can be blood, although red foods or food coloring can also change its appearance.^6,12 One possible source of blood is an anal fissure, a small tear in the skin around the anus that can cause bright red streaks on hard stool.²⁶ It could be blood from your nipple if you’re breastfeeding and have bleeding, cracked nipples. Blood in the stool can also be caused by a severe, bleeding diaper rash.²⁷ Or it can be a sign of milk protein intolerance.²⁵

However, red stool can sometimes indicate a more serious condition, such as an infection or intussusception.^12,28 Intussusception is a medical emergency in which one part of the intestine slides into another. It can cause episodes of severe belly pain, vomiting, unusual lethargy, or stool containing blood and mucus, sometimes described as “red currant jelly.” Not every baby has all of these signs. Seek emergency care for symptoms suggesting intussusception; don’t wait for jelly-like stool to appear.³¹

11. Black Poop

If you notice black stool after the meconium stage, contact your baby’s doctor promptly. Save the diaper or take a photo to help describe what you saw.⁶ Black, tarry stool can indicate bleeding in the gastrointestinal tract.³²

12. White, Gray, or Unusually Pale Poop

Contact your pediatrician right away if your baby’s stool is white, chalky gray, or unusually pale and lacking its normal color. It does not have to be completely white to be concerning. These changes can indicate a liver or bile-flow problem and need prompt assessment.^5,6

Baby poop can look surprising at first, but many color and texture changes are a normal part of growth and development. As you get to know your baby’s usual patterns, it becomes easier to recognize what’s typical for them. If a change concerns you, contact your pediatrician and describe the color, consistency, frequency, and any changes in feeding or wet diapers.

Related: How To Change a Baby’s Diaper