Baby Poop Color Chart
Newborn stool changes dramatically in the first week, then again with formula and again with solids. Almost all of it is normal. Here is what each color means — and the three that need a doctor the same day.
Call a doctor today if you see these
- White / Pale / Chalky — Urgent. Can signal the liver is not delivering bile to the gut.
- Red / Streaks of Blood — Get it checked. Often minor, but blood in a baby's diaper always warrants a call.
- Black (after day 4) — Urgent. Once meconium has passed, black stool can mean digested blood.
Photograph the diaper in natural light before you change it — color is hard to describe over the phone and easy to show.
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Every diaper color, explained
Black / Dark Green (Meconium)
First 24–48 hours — Normal. Sticky, tar-like meconium — the material the gut built up before birth.
Meconium is thick, sticky and almost odorless. It should clear within the first two to three days. If a newborn has not passed any meconium in the first 24–48 hours, tell your midwife or pediatrician — that is the thing to flag, not the color itself.
Dark Green / Brown-Green
Days 2–4 — Normal transitional stool as milk feeding takes over from meconium.
A looser, lighter mix as meconium clears and milk digestion begins. Seeing this by day three is a good sign that feeding is established.
Mustard Yellow, Seedy
Breastfed, day 4 onward — Normal and ideal for a breastfed baby. Loose, grainy, mild-smelling.
The classic breastfed stool: runny, mustard-colored, with small pale 'seeds' of undigested milk fat. Often very frequent in the early weeks — a breastfed newborn may pass stool at nearly every feed. Loose does not mean diarrhea at this age.
Tan / Yellow-Brown
Formula-fed — Normal for formula. Thicker and pastier than breastfed stool, with a stronger smell.
Formula-fed babies produce firmer, more paste-like stool in tan to yellow-brown, and usually pass it less often than breastfed babies. Both patterns are normal — they simply reflect what the baby is digesting.
Bright / Frothy Green
Any age — Usually harmless. Iron-fortified formula, a fast feed, or a passing bug.
Common causes are iron-fortified formula, a foremilk-heavy feed, something in the parent's diet, or a mild viral illness. Green alone in a baby who is feeding well, gaining weight and content is not a concern. Green plus poor feeding, fever, or lethargy is worth a call.
Brown
Once on solids — Normal. Stool darkens and firms as solid food is introduced.
Expect thicker, browner, distinctly smellier stool once solids start, often with recognizable food fragments. Undigested pieces of vegetable or fruit are normal and not a sign of poor digestion.
White / Pale / Chalky
Any age — Urgent. Can signal the liver is not delivering bile to the gut.
Chalky, clay or putty-colored stool means little or no bile is reaching the intestine, and it is the key early sign of biliary atresia. Treatment outcomes depend heavily on how early it is caught — ideally within the first eight weeks of life. Do not wait and watch. Contact a doctor the same day, and photograph the diaper in natural light to show them.
Red / Streaks of Blood
Any age — Get it checked. Often minor, but blood in a baby's diaper always warrants a call.
Beets, tomato and some medicines can tint stool red harmlessly. Genuine blood most often comes from a small anal fissure from straining, or a cow's-milk protein allergy. Streaks of blood mixed with mucus, or a baby who seems unwell, needs prompt assessment. Either way, phone rather than assume.
Black (after day 4)
After meconium has cleared — Urgent. Once meconium has passed, black stool can mean digested blood.
Iron supplements can darken stool harmlessly, and a breastfed baby may swallow blood from a cracked nipple. But genuinely black, tarry stool after the first few days can be melena — digested blood from higher in the gut. If the baby is not on iron, treat it as urgent.
What changes, and when
The first week is the most dramatic. Meconium clears in two to three days, transitional stool follows, and by day four or five a feeding pattern establishes itself. Breastfed and formula-fed stool then look genuinely different from each other, and neither is a problem.
Solids change everything again — thicker, browner, considerably smellier, and often containing recognizable pieces of food. That is normal digestion, not a failure of it.
Frequency matters less than you think
A breastfed newborn might fill a diaper at nearly every feed. An older breastfed baby might go several days without one and be entirely well. What matters is that the stool is soft and passed without distress. A hard, pellet-like stool that clearly hurts is worth raising even if it arrives daily.
This page summarizes mainstream pediatric guidance and is not medical advice or a diagnosis. Trust your instincts — if something seems wrong with your baby, contact your pediatrician regardless of what a chart says.
FAQ
What color should baby poop be?
It depends on age and feeding. The first few days bring black, tar-like meconium, which is normal. Breastfed babies then settle into loose mustard-yellow, seedy stool. Formula-fed babies produce thicker tan to yellow-brown stool. Once solids start, it darkens to brown. All of these are normal.
What baby poop colors are dangerous?
Three. White, pale or chalky stool can mean bile is not reaching the gut and is the key early sign of biliary atresia — contact a doctor the same day. Red stool or blood streaks always warrant a call, even though the cause is often a minor anal fissure or a milk protein allergy. Black, tarry stool after meconium has cleared, in a baby not taking iron, can be digested blood.
Is green baby poop normal?
Usually, yes. Green stool is commonly caused by iron-fortified formula, a foremilk-heavy feed, something in a breastfeeding parent’s diet, or a mild viral illness. If the baby is feeding well, gaining weight and generally content, green alone is not a concern. Green combined with poor feeding, fever, or unusual lethargy is worth a call.
Why is my newborn’s poop black?
In the first 24 to 48 hours, black is meconium — the sticky, tar-like material the gut accumulated before birth, and entirely normal. It should clear within two to three days. Black stool appearing after meconium has passed is different, and in a baby not on iron supplements it should be treated as urgent.
How often should a baby poop?
The range is very wide. A breastfed newborn may pass stool at nearly every feed, while an older breastfed baby can go several days between movements and still be perfectly healthy. Formula-fed babies are typically less frequent than breastfed newborns. Consistency and comfort matter more than frequency — a soft stool passed without distress is fine, however often it arrives.
Sources
- NHS — Baby poo
- American Academy of Pediatrics — Baby's first stools & stool color
- Children's Liver Disease Foundation — pale stool & biliary atresia screening