# Newborn Poop Colors: What's Normal and What Needs a Closer Look

> A color-by-color guide to baby poop, from meconium to yellow seedy stools, and which colors need checking.

Stage: newborn - Topic: Everyday care - Page: https://www.askcladle.com/guides/newborn/newborn-poop-colors-and-what-they-mean

Grounded in: AAP HealthyChildren ("Baby's First Bowel Movements", stool guidance), and state newborn stool color card programs used to help catch biliary atresia early. Summarized in Cradle's own words; none of these sources endorse Cradle. General information, not medical advice.

Reviewed: 2026-11

## TLDR

- Black meconium, then greenish, then mustard yellow and seedy by about day 5 (tan and thicker on formula). Green is usually fine.
- White, gray or pale clay-colored stool needs a call the same day; it can be a rare liver condition that's best treated early.
- Also call for any blood, or black stools after the first week. Take a photo of anything you're unsure about.

## The first week: a color timeline

- Days 1-2: meconium. Black or dark olive green, thick and sticky like tar. A little petroleum jelly
  on the skin makes it easier to wipe off.
- Days 3-4: transitional stools. Greenish brown, looser. This shift is a good sign that milk is
  getting through.
- Day 5 onward: mustard yellow and seedy for breast milk; tan, yellow or light brown and a bit
  thicker, like peanut butter, for formula. Combination-fed babies land in between.
- For how many wet and dirty diapers to expect, see the diapers guide.

## Colors that are usually normal

- Yellow, mustard, orange-yellow: classic breast milk poop.
- Green: very common. It can come from fast passage through the gut, a foremilk-heavy feed, a
  passing virus, or iron-containing formula. A green stool in a baby who is feeding and growing
  well is not a worry.
- Tan or brown: typical for formula, and for all babies once solids start.
- Dark green, almost black: can happen with iron-fortified formula or iron drops.

## Texture

- Breastfed stools are runny, with little curds that look like seeds. That is not diarrhea.
- Diarrhea looks different: much more watery than usual, much more often, sometimes leaking out
  of the diaper, or with mucus.
- A little mucus now and then, often during teething or a cold, is common.
- Hard, pebble-like stools or a dry, crumbly texture point to constipation, which is unusual in
  breastfed newborns.

## Colors that need a closer look

- White, chalky gray, or pale clay-colored stool. This can be a sign that bile is not reaching the
  gut, as with biliary atresia, a rare liver condition that does far better when it is treated in
  the first weeks. Some hospitals hand out a stool color card for this reason. Keep the diaper or
  take a photo in good light.
- Red streaks or flecks. Often a tiny tear near the anus (a fissure) from straining, or swallowed
  blood from a cracked nipple. It can also be a sign of cow's milk protein allergy.
- Black stool after the first week, once meconium has passed and the baby isn't on iron.
- Things that can fool you: beets or red foods (once solids start), red-tinged urine crystals in the
  first days, and a dark green that looks black in dim light. Check in daylight.

## Tips

- Take a photo of any stool you are unsure about. It saves describing it on the phone.
- Note how the baby is feeding, the number of wet diapers and whether they seem well. Those matter
  more than any one color.

## When to check in

- Mention mucus, frequent green stools with fussiness, or a hard stool pattern at the next visit.
- Call the pediatrician the same day for white, gray or pale clay-colored stools, any blood, or
  black stools after the first week.
- A baby with bloody stool who is also vomiting green, very sleepy or has a swollen belly needs
  urgent care; if they are hard to wake, call 911.