24 August 2026 · Veronica Chi
Business & Product Director · Mum of two
What Should Newborn Poop Look Like? A Colour and Texture Guide
It changes twice in the first week. Day one to two is meconium — black, sticky and tarry. Day three to four is a transitional dark green. By day five, a breastfed newborn's stool is mustard-yellow, loose and seedy, and a formula-fed newborn's is tan to yellow-brown and firmer, like soft peanut butter. All of that is normal, and the range of normal is much wider than most parents are told.
Three colours are not normal at any age: white or chalky pale, red, and bright green with mucus persisting alongside an unwell baby. Everything else on the spectrum from yellow to green to brown is a variation rather than a problem.
The first week, day by day
| Day | Colour and texture | How many |
|---|---|---|
| 1–2 | Meconium: black-green, sticky, tarry | 1–2 a day |
| 3–4 | Transitional: dark green, looser, less sticky | At least 2 a day |
| 5–7 breastfed | Mustard-yellow, runny, seedy | 3–4 or more a day |
| 5–7 formula-fed | Tan to yellow-brown, thicker, smoother | 1–3 a day |
| Any day 1–5 | Still black meconium at day five | Ask a midwife or doctor |
The meconium clearing on schedule is one of the earliest signs that feeding is going well. Still black at day five is worth a call, not a wait.
What does each colour mean?
| Colour | Usually means | Action |
|---|---|---|
| Mustard yellow, seedy | Normal breastfed stool | None |
| Tan or yellow-brown | Normal formula-fed stool | None |
| Dark green | Normal transitional, or iron in formula | None |
| Bright green, frothy | Sometimes fast let-down or a foremilk imbalance | Check feeding if it persists |
| Brown | Normal, particularly after solids begin | None |
| Black after day 5 | Not meconium — possibly old blood | See a doctor |
| White, chalky or pale grey | Possible liver or bile duct problem | Same-day medical review |
| Red streaks or clots | Blood — fissure, allergy or infection | See a doctor |
What about texture?
Loose is normal for a breastfed newborn and is not diarrhoea. This confuses almost everyone: breastfed stool is often watery enough to soak into the diaper with no solid form at all, and that is exactly what it should look like. It is the frequency and the baby's condition that distinguish normal loose stool from actual diarrhoea.
- Seedy — small pale curds through yellow liquid. Classic breastfed stool.
- Smooth and thick — formula-fed, like soft peanut butter. Also normal.
- Very watery, sudden, more frequent than usual, and with an unsettled baby — that is diarrhoea, and it dehydrates a small baby quickly in this heat.
- Hard pellets — constipation. Rare in exclusively breastfed babies; more common after formula or solids begin.
- Mucus, occasionally — usually nothing. Persistent mucus with blood, or with a distressed baby, is not.
The rest of the set
When should you ring a doctor?
- White, chalky or pale grey stool at any age. This is the one that needs a same-day appointment.
- Blood — streaks, clots, or anything that looks like redcurrant jelly.
- Black stool after day five.
- Watery, frequent stools with fever, vomiting, or fewer wet nappies than usual.
- No stool at all in the first 48 hours of life.
- Hard pellets with obvious pain, or blood on the outside of a hard stool.
- Any stool change alongside poor weight gain, eczema that will not settle, or persistent mucus — the picture that raises cow's milk protein allergy.
We can describe what tends to be normal. We cannot look in the diaper, and a photograph on your phone shown to a doctor is worth more than any chart on the internet — including this one. Polyclinics look at these several times a day.
Read next
Questions parents ask
What should newborn poop look like?
Black and tarry for the first two days, dark green through days three and four, then mustard-yellow and seedy if breastfed or tan and thicker if formula-fed.
What colour baby poop is not normal?
White or chalky pale, red or bloody, and black after day five. All three need medical review — white stool needs it the same day.
Is runny newborn poop normal?
Yes, for breastfed babies. Breastfed stool is often watery with pale seedy curds and no solid form at all. That is normal, not diarrhoea.
What is meconium and how long does it last?
The black, sticky, tarry first stool. It clears over the first two to three days; still black at day five is worth a call to a midwife or doctor.
What does formula-fed baby poop look like?
Tan to yellow-brown, thicker and smoother than breastfed stool — around the consistency of soft peanut butter — and usually less frequent.
Sources
- NHS — Newborn poo
- American Academy of Pediatrics — Baby's first days: bowel movements
- HealthHub — Ministry of Health Singapore
This guide is general information, written to help you understand a topic and ask better questions — it is not medical advice and does not replace your own doctor, midwife or paediatrician. Anything that worries you about your baby belongs with them.