Baby poop colours, and how often a newborn should poop and pee

Newborn poop changes a lot in the first week. It starts black and sticky, turns greenish, then settles into soft yellow. Almost any shade of yellow, green or brown is normal. The colours that need a doctor quickly are white, chalky grey or very pale yellow, red, and black after the first few days. Wet nappies matter just as much as dirty ones, because they tell you if your baby is getting enough milk.

What colour should newborn poop be?

In the first 2 to 3 days it is black or dark green and sticky like tar. After that it turns soft and mustard yellow in breastfed babies, and pale yellow to tan in formula-fed babies.

The first stool is called meconium. It is made of things the baby swallowed in the womb. In one study of about 1000 newborns, the average time to the first stool was about 8 hours after birth.¹ Tell the nurse or doctor if your baby has not passed any stool by 24 hours.

Around day 3 to 5 you will see "changing" stools that are greenish brown. Once your milk comes in, breastfed poop becomes loose, yellow and seedy. Breastfed babies have softer and more yellow stools than formula-fed babies.²

Is green poop normal in a newborn?

Yes, green poop is usually normal. In a Dutch study of healthy babies, half of the stools of formula-fed babies were green by 3 months, and the authors called this normal.²

In breastfed babies, green stool can show up during a cold, after a change in feeding, or for no clear reason. If your baby is feeding well, passing urine and gaining weight, a green nappy is not a worry. Dark green, almost black stool after the first week is different. Show it to your doctor.

How many times a day should a breastfed baby poop?

In the first month, most breastfed babies poop often, sometimes after every feed. In one study, exclusively breastfed babies averaged about 5 stools a day in the first month.³

The number falls with age. In the Dutch study, breastfed babies went from about 3 to 4 stools a day at 1 month to about 2 a day at 3 months.² A small stain counts as a poop. What matters more than the count is that the stool is soft and your baby is feeding and growing well.

How often does a formula-fed baby poop?

Formula-fed babies usually poop less often than breastfed babies, and the stool is firmer. In the first month, one study found about 2 stools a day in formula-fed babies compared with about 5 in breastfed babies.³

Formula stool is often pale yellow, tan or green, and has a stronger smell. It should still be soft, like peanut butter. Hard pellets suggest constipation. Always mix formula exactly as the tin says. Extra powder can make stools hard.

My baby has not pooped in 5 days. Is that constipation?

Not always. A breastfed baby over a few weeks old can go several days without a poop and still be well, as long as the stool is soft when it comes.⁴

In a French study, 37% of exclusively breastfed babies had at least one gap of more than a day between stools, and the authors advised a calm wait-and-see approach.⁴ In another small French study, long gaps were seen in 28% of breastfed and 8% of formula-fed babies, but this difference could have been due to chance.³

Constipation is about hard stool, not the number of days. Watch for: - Hard, dry pellets or very large stools - Pain or bleeding when passing stool - A swollen, tight tummy, vomiting, or poor feeding

The last group needs a doctor the same day. In the first week of life, a baby with few stools may simply not be getting enough milk, so see your doctor then too.

Why does my baby grunt, strain and go red before pooping?

Most often this is normal. Many babies strain, cry and go red for several minutes and then pass a soft stool. Doctors call this infant dyschezia (difficult pooping in a healthy baby).

In a Swedish study, about 22% of healthy babies had this pattern at 2 weeks of age, and it became less common over the next few months.⁵ The baby is learning to relax the bottom muscles while pushing with the tummy. It is not constipation, because the stool is soft. Please do not use soap sticks, thermometers or oil in the bottom to "help". This can hurt the skin and teaches nothing. Time fixes it.

Is blood in baby stool serious?

It can be minor or serious, so always show your doctor. In otherwise well newborns with a few streaks of blood, the most common findings are harmless bleeding that settles by itself, cow's milk protein allergy, and swallowed blood from the mother.⁶

Swallowed blood often comes from cracked nipples. It makes the stool or vomit look dark. A small anal tear from a hard stool can also leave a streak of red.

Cow's milk protein allergy can show as blood and mucus in the stool. In a breastfed baby, the usual step is for the mother to stop all cow's milk products under medical advice.⁷ Most children outgrow this allergy, with more than 75% tolerant by 3 years.⁷ Large amounts of blood, a swollen tummy, green vomit or a sleepy baby means hospital now.

What does white, grey or pale stool mean in a baby?

Pale stool can be a sign of a blocked bile duct, called biliary atresia. It needs an urgent check, ideally the same week, even if the baby looks well.

Bile gives stool its yellow or green colour. When bile cannot reach the gut, stools turn chalky white, grey or very pale yellow, and the urine is often dark. Biliary atresia is rare, about 1.7 to 1.9 per 10,000 babies in Taiwan.⁸ The operation (called the Kasai procedure) works better when done before 60 days of age.⁸

Taiwan and Japan give parents a stool colour card to compare nappies against. These programmes helped find the disease earlier and improved long-term results.^8,9 Take a photo of a pale nappy in daylight and show it to your doctor.

Is black poop normal after the first week?

Black stool in the first 2 to 3 days is meconium and normal. Black, tarry stool later on is not expected and should be checked.

It can mean old blood, often swallowed from cracked nipples, but sometimes from the baby's own gut. Iron drops can turn stool dark green or nearly black, which is harmless. If your baby is not on iron and the stool is black and sticky after day 5, show the nappy to your doctor.

How many wet nappies should a newborn have?

Wet nappies go up day by day as milk comes in. In one study of breastfed babies, the usual number was about 2 on day 1, 5 on day 4 and 7 on day 7.¹⁰

So by the end of the first week, expect at least 6 heavy wet nappies a day, with pale yellow urine. Young babies may need 10 to 12 nappy changes a day.¹¹ A disposable nappy can hide a small wee. Feel the weight of it, or put a tissue inside to check.

Having 3 or fewer dirty nappies on day 4, together with late milk coming in, was linked with poor milk intake in the same study.¹⁰ If you are worried, get your baby weighed.

What are pink or orange crystals in my baby's nappy?

They are usually urate crystals, a normal salt in concentrated urine. They look like brick dust or a pink, orange or red stain in the first few days.

A 2026 study checked reddish nappy stains in newborns. It found them in 22% of girls and 13% of boys, and most stains were urate crystals, not blood.¹² They are common before your milk is fully in. If you still see them after the first 4 or 5 days, your baby may need more milk. Feed more often and ask for a weight check.

Can a baby girl have a little blood in her nappy?

Yes, sometimes. A few baby girls pass a small amount of blood or white mucus from the vagina in the first week, caused by the mother's hormones fading away.

Do not confuse this with urate crystals. In the 2026 study, only about 2.5% of the red stains in girls' nappies were true blood, while most were urate crystals.¹² Either way, a small stain in a well baby needs no treatment. Clean front to back with water.

What does diarrhoea look like in a newborn?

Breastfed stool is normally runny, so diarrhoea means a clear change: more stools than usual, very watery, often spraying out or soaking the nappy.

Diarrhoea can dry a small baby out fast, especially in Kolkata's summer heat. Keep breastfeeding. Do not start sugar water, glucose water or home remedies. See a doctor the same day if there is fever, poor feeding, fewer wet nappies, or blood in the stool.

Does what I eat change my baby's poop?

Usually not much. Most mothers can eat normal home food, including dal, rice, fish, vegetables and spices, without any change in the baby's stool.

Grandmothers often blame a green or loose nappy on something the mother ate. The main real exception is cow's milk protein allergy, where the mother's milk and dairy intake can matter.⁷ Do not cut out foods without a doctor's advice. A restricted diet can leave the mother short of nutrition.

When should I take my baby to a doctor about poop or urine?

Go to hospital or call your doctor the same day for any of these. - White, grey or chalky stool⁸ - Dark urine that stains the nappy yellow - Red blood in the stool⁶ - Black, tarry stool after day 5 - Green vomit, a swollen tummy, or no stool in the first 24 hours - Fewer than 6 wet nappies a day after day 5, or urate crystals that keep coming back - Not feeding well, temperature above 37.5 degrees C, or below 35.5 degrees C¹³ - Breathing faster than 60 a minute, severe chest in-drawing, fits, or no movement of their own¹³ - Jaundice (yellow skin) in the first 24 hours, or yellow palms and soles whatever the age¹³