Newborn Poop: What's Normal?

Newborn poop can be surprisingly varied. In the first days and weeks, you may see black, green, yellow or brown stools, and the texture can range from sticky to loose or paste-like. Much of this is normal and changes as your baby begins feeding and their digestive system adjusts after birth.

Your baby’s first poo is usually dark green or black and sticky. This is called meconium. Over the following days, it should become lighter, eventually changing towards yellow in breastfed babies and often a darker, firmer brown in formula-fed babies.

There is plenty of normal variation. What matters is knowing the general pattern for newborn nappies and recognising changes that should be discussed with your midwife, health visitor or GP.

What does normal newborn poop look like?

A newborn’s poo changes quickly after birth, so what looks normal on the first day will not necessarily look the same several days later.

The first poo: meconium

The first stools your baby passes are called meconium.

NHS guidance describes meconium as dark greenish-black and sticky. It can look quite unlike the poo you might have expected to see in a baby’s nappy.

This is normal in the first couple of days.

Changing stools

As your baby starts taking milk, their poo begins changing.

During the next few days, the very dark meconium becomes lighter. NHS maternity guidance describes stools changing through brown, green or yellow before becoming yellow as feeding becomes established.

You may therefore see several colours during this transition rather than one sudden change.

Yellow newborn poop

Yellow or mustard-coloured poo is common in breastfed babies after the early meconium stage.

It can be loose, runny or slightly seedy in appearance. That texture can sometimes look like diarrhoea to a new parent, but loose yellow stools can be normal for a breastfed newborn.

Brown newborn poop

Formula-fed babies generally have firmer stools than breastfed babies. NHS guidance says their poo tends to be darker brown and more strongly smelling.

It may also have a thicker or more paste-like consistency.

How feeding affects newborn poop

How your baby is fed can make a noticeable difference to both the appearance and frequency of their stools.

Breastfed baby poop

Breastfed newborns commonly have yellow or mustard-coloured poo.

The NHS says breastfed babies’ poo tends to be runny and does not smell strongly. Some stools can also look grainy or seedy.

In the early weeks, a breastfed baby may poo during or after feeds. Later, the pattern can change considerably.

Formula-fed baby poop

Formula-fed babies usually have firmer and darker stools than babies who are exclusively breastfed.

Their poo can also smell stronger.

Some formulas may make stools appear dark green. A change from breastfeeding to formula feeding can also make your baby’s poo darker and more paste-like.

Combination feeding

If your baby receives both breast milk and formula, their nappies may not fit neatly into either description.

Colour, consistency and frequency can vary according to feeding. Changes can also happen when the balance between breast milk and formula changes.

If your baby’s stools change significantly and you are unsure whether the change is expected, ask your health visitor or another healthcare professional for advice.

Is green newborn poop normal?

Green poo can sometimes be normal.

Meconium begins as a very dark greenish-black colour, and stools can also appear green while changing from meconium to the lighter stools seen after the first few days.

Formula can sometimes cause dark green poo too.

Because colour alone does not tell you everything about your baby’s health, consider the wider picture. Is your baby feeding normally? Do they seem well? Is this a new or persistent change?

If you are worried about green stools, particularly alongside feeding difficulties or other symptoms, speak to your midwife, health visitor or GP.

How often should a newborn poop?

There is a wide range of normal, and the pattern changes as babies grow.

The NHS says babies average around four poos a day during the first week, although individual babies can poo more or less frequently.

Breastfed newborns may poo with each feed in the early weeks. Once breastfeeding is established, some babies may go several days without passing a stool.

Formula-fed newborns may initially poo several times a day, with the frequency often decreasing over time.

Frequency is only part of the picture. The appearance and consistency of the poo, your baby’s feeding and how well they seem are also important.

If you are concerned that your newborn is not passing stools as expected, particularly during the first days after birth, speak to your midwife or health visitor.

Does straining mean a newborn is constipated?

Not necessarily.

Babies can grunt, strain, squirm or become red in the face while trying to poo. If the stool that eventually comes out is soft, this does not automatically mean your baby is constipated.

Constipation is more associated with stools that are dry, hard, lumpy or difficult to pass.

Do not give a newborn water, laxatives or other remedies for constipation unless a qualified healthcare professional has advised you to do so.

If your baby’s stools are hard, they seem to be in pain, their tummy appears swollen, they are feeding differently or you are otherwise concerned, ask your midwife, health visitor or GP for advice.

What newborn poop colours should you get checked?

Many changes in colour are harmless, but some deserve medical attention.

Pale or creamy-white poo

Very pale, chalky, creamy or white stools should not simply be watched at home.

NHS guidance advises seeking medical advice if a baby’s poo is pale or creamy coloured because it can be associated with problems affecting the liver or bile flow.

If possible, keep the nappy or take a clear photograph to show the healthcare professional.

Blood in your baby’s poo

Blood in a newborn’s stool should be discussed with a healthcare professional.

There can be different explanations for blood in a nappy, but it is not something you need to diagnose yourself.

Contact your midwife, health visitor, GP or NHS 111 for advice, particularly if the blood is more than a tiny streak, keeps appearing or your baby seems unwell.

Black poo after the meconium stage

Black or very dark stools are expected when your baby is passing meconium immediately after birth.

If black stools appear later, after the meconium stage has passed, seek medical advice rather than assuming they are normal.

What about very watery or unusually smelly poo?

Breastfed newborn poo can naturally be very loose, so watery-looking stools are not always diarrhoea.

A sudden change from your baby’s usual pattern is more useful to notice than texture alone.

NHS children’s health guidance recommends seeking advice if your baby’s poo becomes very watery, unusually smelly or changes significantly.

Pay attention to how your baby seems overall too. Feeding less than usual, fewer wet nappies, unusual sleepiness or other signs of illness alongside a major change in stools are reasons to seek medical advice.

Newborn nappies can tell you about feeding too

Dirty and wet nappies are among the things healthcare professionals use when considering how feeding is going.

During the first days after birth, both the number of wet nappies and the appearance of stools change as milk intake increases.

If your baby’s meconium is not changing towards lighter stools as expected, there are fewer wet or dirty nappies than your maternity team has told you to expect, or you are concerned about feeding, contact your midwife or health visitor.

You do not need to analyse every nappy. A general awareness of your baby’s usual pattern is enough, and it becomes easier as you get to know them.

When to get professional advice

Speak to your midwife, health visitor, GP or NHS 111 if your newborn’s poo is very pale, white or creamy, contains blood, becomes unexpectedly black after the meconium stage, becomes unusually watery or smelly, or changes significantly from their normal pattern.

You should also seek advice if changes in poo happen alongside poor feeding, fewer wet nappies, unusual sleepiness, a swollen tummy, repeated vomiting, jaundice that concerns you or other signs that your baby may be unwell.

NHS guidance advises urgent assessment if a baby with jaundice has pale creamy poo or dark yellow or brown urine.

Newborns can become unwell quickly. If your baby seems seriously ill, is difficult to wake, has difficulty breathing, is floppy or has another emergency symptom, follow current NHS urgent-care guidance and seek immediate medical help.

If you simply feel that something is not right, you can still ask for help. Your midwife, health visitor or GP can look at the whole picture rather than relying on the contents of one nappy.