New parents spend a surprising amount of time thinking about nappies — and a baby poop colour chart is one of the most reassuring things you can keep in your head. The colour, texture, and frequency of your baby’s stools change a lot in the first year, and most of those changes are completely normal. This guide walks you through what each colour usually means, how feeding affects it, and the few red flags that genuinely deserve a call to the doctor.
What is normal for newborns: meconium
In the first day or two, your newborn will pass meconium — a very dark, almost black, tar-like substance. This is simply everything your baby swallowed in the womb, and passing it is a healthy sign the digestive system is working. Over the next few days it transitions to a greenish-brown colour before settling into the “milk poop” stage. If your baby has not passed meconium within 24 hours of birth, mention it to your midwife or doctor.
The baby poop colour chart: stage by stage
Mustard yellow (breastfed babies)
This is the classic breastfed-baby poop: a bright mustard or golden yellow, often loose, seedy, or slightly curdled in texture. It can look alarmingly runny to first-time parents, but this consistency is completely normal for an exclusively breastfed baby. These babies may poop after every feed or go several days between nappies — both can be normal.
Tan, yellow-brown, or greenish-brown (formula-fed babies)
Formula-fed babies tend to produce firmer, more formed stools in shades of tan or yellow-brown. They also poop less often — once a day or every couple of days is typical. As long as the stool is soft and your baby seems comfortable, the colour and frequency are fine.
Green poop
Green is one of the most common worry-colours, and it is usually harmless. In breastfed babies it can happen when the baby gets a lot of the thinner foremilk and less of the richer hindmilk, or during a growth spurt with frequent feeding. It can also follow a mild stomach bug, teething, or certain foods in a breastfeeding parent’s diet. Occasional green stools in a happy, feeding-well baby need no action.
Brown (once solids start)
When you introduce solids at around six months, expect everything to change: stools become darker brown, thicker, and noticeably smellier. Undigested bits of food — sweetcorn, peas, bits of carrot — often appear whole. That is normal; a baby’s digestive system is still learning.
Orange, or brightly coloured after new foods
Carrots, sweet potato, beetroot, and berries can tint stools orange, reddish, or even dark purple. If your baby recently ate something strongly coloured, that is almost always the explanation. It passes through in a day or two.
When poop colour means call the doctor
Most colour variation is harmless, but three colours are genuine red flags. If you see any of these, contact your doctor or health visitor promptly:
- White, pale grey, or chalky stools. Pale stools can signal that bile is not reaching the intestines properly, which can indicate a liver or bile-duct problem. This one should always be checked quickly — ideally within a day.
- Black stools after the newborn days. Once meconium has passed (by day 3–4), black, tarry stools can indicate digested blood from higher up in the digestive tract. Do not confuse this with very dark green, which is common and fine.
- Bright red blood in the stool. Small streaks of red can sometimes come from a tiny anal tear if your baby is straining, but repeated or significant bright red blood, or blood mixed through the stool, needs medical assessment — it can point to an allergy, infection, or intestinal irritation.
A useful rule of thumb: trust the combination of colour plus behaviour. A baby who is feeding well, gaining weight, and seems comfortable is almost always fine regardless of colour. A baby with a red-flag colour who is also unusually sleepy, refusing feeds, vomiting, or running a fever needs attention sooner.
Poop and constipation: what is normal?
Straining, grunting, and going red in the face while pooping is normal baby behaviour — their abdominal muscles are still learning to coordinate. True constipation means hard, dry, pellet-like stools, sometimes with pain or blood from small tears. Breastfed babies rarely get constipated; formula-fed babies and those on solids are more prone to it. If your baby’s stools become hard and difficult to pass, our guide to baby constipation remedies for breastfed infants covers safe, gentle ways to help.
A calm approach to the nappy
Baby poop goes through a rainbow of normal in the first year — from black meconium to mustard yellow to solid-food brown. Keep this chart in mind, watch your baby rather than just the nappy, and remember that only pale, black (after the early days), or bloody stools are true causes for concern. When in doubt, take a photo of the nappy to show your doctor — it is far more useful than a description, and no clinician will think twice about it.
