There is something nobody really prepares you for when you have a baby, and that is how much of your life is suddenly taken up with poo. You'll talk about it, look at it, photograph it and probably have conversations about it!
And actually, it makes sense. Your baby’s nappies can tell us a lot about what is happening inside that tiny digestive system, particularly in those first few days and weeks.
Baby poo can look very different from one day to the next and this is where parents can understandably become worried. As a midwife supporting new parents, baby poo is one of the questions I’m asked often about.
Is that colour normal?
Should it be so runny?
Why is it green?
Why hasn’t my baby pooed today?
What are those little bits?
Why does my newborn make so much noise when they seem to be trying to do one?
So, let’s take some of the mystery out of it, because there's a surprisingly wide range of what can be completely normal.
Those first few days
Your baby’s first poo is called meconium and it is usually very dark green or almost black, thick, sticky and tar-like. If you’ve never seen it before it can look alarming, but this is exactly what we expect during the first hours after birth.
Meconium is made up of material that has accumulated in your baby’s bowel during pregnancy, including mucus, cells and substances swallowed while they were in the womb, with most babies passing it within the first 24 to 48 hours.
Over the following few days, you should see a gradual change in both the colour and consistency. It may become lighter green and then move towards yellow, mustard or yellow-brown as your baby’s milk intake increases and their digestive system begins to settle into its new job. This transition is one of the things we look for alongside feeding, wet nappies and your baby’s general wellbeing.
How often should my baby poo?
This is probably one of the questions parents ask most often, and unfortunately there isn’t one perfect number that applies to every baby.
In the very early days, we expect your baby’s bowel movements to increase as their milk intake becomes established. By day four or five, we would usually expect the poo to have moved away from meconium and become much lighter and softer. After that, frequency can vary enormously and how your baby is fed can make a difference too.
A baby having breast milk may poo several times a day in the early weeks. Some babies seem to poo after almost every feed, while others may have fewer bowel movements. The poo is usually soft, loose and yellow or mustard-coloured, often with those little ‘seedy’ bits that parents become familiar with.
After around six weeks, some babies having breast milk start to poo much less frequently. They might go several days without a poo and, occasionally, even longer. That can still be completely normal provided the poo is soft when it comes, your baby is feeding well, having plenty of wet nappies, growing and generally seems well.
In the early weeks, a formula-fed baby may poo several times a day too, although there is plenty of individual variation. As they get a little older, their pattern will often become less frequent and more predictable.
Formula-fed babies tend to have stools that are slightly thicker and more formed. They are often yellow-brown or darker and usually smell stronger. Some formula milks can also make poo appear darker green and that on its own isn’t necessarily a sign something is wrong. The important thing is that the stool remains reasonably soft and that your baby is feeding, growing and producing the wet nappies we would expect.
So, when we talk about what is normal there really isn’t one answer. One baby may have several soft yellow poos a day, while another may may have thicker, darker stools and develop a different pattern. Neither is right or wrong, with the feeding method simply being one of the things that influences what is normal for your individual baby. This is why comparing your baby’s nappies with another baby’s can be so unhelpful. We are more interested in what is normal for your baby, and whether they are otherwise well.
Why can I sometimes see little bits in my baby’s poo?
The first time you see those little yellow, white or seedy-looking bits in a nappy, it is easy to wonder whether something is wrong. In a baby’s poo, those little seeds are usually simply milk components, including fat, that haven’t been completely broken down during digestion. You might also see tiny white or yellow curds, a little mucus or occasionally some green colouring.
A small amount of mucus can be normal because the bowel naturally produces mucus to help things move through the digestive tract. Babies have immature digestive systems, and their poo can look rather unusual! We become more concerned about persistent or significant changes, particularly when they occur alongside blood, ongoing diarrhoea, vomiting, poor feeding, eczema or concerns about growth.
Why is my baby so noisy when trying to poo?
Newborn babies can be incredibly noisy. They grunt, strain, wriggle, pull their legs up, go bright red and make all sorts of noises when they are trying to move wind or poo through their bowel. It can look as though they are struggling and, understandably, parents often assume their baby must be in pain. But it doesn’t necessarily mean that at all.
Your baby’s digestive system is still immature and they are learning how to coordinate the muscles they need to use. Their abdominal muscles and diaphragm help create pressure within the abdomen, while the muscles around the bottom need to relax to allow the stool to pass. For us, that coordination happens without us thinking about it, but your newborn is still learning.
So, you can have a perfectly healthy baby who grunts, strains, turns bright red and seems to work incredibly hard to produce a soft poo. If they settle afterwards, are feeding well, having their wet nappies and the stool itself is soft, this doesn’t necessarily mean they are constipated or in pain. Sometimes it is just a case of their digestive system learning how to do its job.
What does constipation actually look like?
This is where the number of days between poos can be misleading. Constipation isn’t simply about how often your baby goes. A baby can poo every day and still be constipated if the stool is hard and difficult to pass, while another can go several days without pooing and not be constipated at all if the stool is soft when it arrives.
With constipation, we are more likely to see hard, dry or pellet-like stools, and your baby may consistently struggle to pass them and seem uncomfortable while doing so. So, rather than thinking, ‘They haven’t pooed for three days, so they must be constipated,’ look at the consistency of the stool and how your baby is otherwise behaving.
When should I get my baby checked?
There are some changes I would always want you to discuss with a healthcare professional rather than simply waiting to see what happens. If your newborn hasn’t passed meconium within the first 24 to 48 hours, this should be discussed with your maternity team or another healthcare professional. Similarly, if your baby isn’t feeding well, isn’t producing the wet nappies we would expect, is becoming unusually sleepy or difficult to wake, or simply doesn’t seem themselves, they should be assessed.
Blood in a baby’s poo also deserves attention, particularly in a young baby. There are a number of possible causes, including a small tear around the anus, infection or an allergic reaction, and it isn’t possible to know the cause simply by looking at the nappy.
There is also one colour in particular that I don’t want parents to dismiss, and that is very pale, white, grey or chalky-looking poo. This can sometimes indicate a problem with bile flow and needs prompt medical assessment. Similarly, if your baby’s stools suddenly become much more watery and much more frequent than is usual for them, particularly if they also have vomiting, poor feeding, a fever or fewer wet nappies, they need to be assessed.
As always, if your baby simply doesn’t seem right to you, please trust that feeling and ask for advice.
What about cow’s milk protein allergy?
Cow’s milk protein allergy, or CMPA, affects a minority of babies. It is important to recognise it, but many common baby symptoms have other explanations and not every green poo, bout of wind, episode of reflux or small amount of mucus points to an allergy.
When considering CMPA, we look at the overall pattern. Symptoms may include persistent diarrhoea or constipation, blood or significant mucus in the stool, vomiting or troublesome reflux, abdominal discomfort, eczema, feeding difficulties or concerns about growth.
An allergy occurs when the immune system reacts to proteins in cow’s milk. Some reactions happen soon after exposure, while others are delayed, making them more difficult to recognise. If you are concerned about CMPA, have your baby’s symptoms assessed rather than removing foods from your diet or repeatedly changing formula without professional guidance.
As your baby gets older
As your baby’s digestive system matures, you will gradually recognise their individual pattern. Their poo may become more predictable, although variation will continue. Then solids are introduced and everything changes again. Colour, smell and consistency will reflect what your baby has eaten, but by then you will probably know what is normal for your baby and feel less worried by one unusual nappy.
Look at the baby, not just the nappy
When you are staring at a strange-looking poo at 3am, it is easy to focus entirely on the nappy. Instead, look at your baby as a whole. Are they feeding well? Do they have plenty of wet nappies? Are they waking for feeds and having periods when they are alert and responsive? Are they settling between feeds and growing as expected? These things tell us much more than one unusual-looking poo.
Your baby’s digestive system is immature, and there will be grunting, gurgling, wind, funny noises and spectacularly strange nappies along the way. Most of the time, this is simply part of having a newborn. But if you are unsure, ask. You are never wasting someone’s time by checking whether your baby’s poo is normal. Sometimes you simply need someone to look at the whole picture and reassure you that your baby’s digestive system is still developing and learning how to work.
And honestly, in those early weeks, there are few more reassuring words you can hear.
