Constipation in babies: causes, signs and what helps
Constipation is one of those things that can catch parents off guard, especially in the early months when it is not always clear what counts as normal. The good news is that it is common, and there are straightforward steps that can help. This article summarises NHS guidance on what to look for, what tends to cause it in babies, and when it is worth speaking to a GP or health visitor.
What constipation looks like in babies
Because every baby's bowel habits are a little different, constipation is less about counting days and more about noticing a change. According to NHS guidance, a baby may be constipated if they:
- have passed fewer than 3 poos in the last week
- are producing stools that are unusually large, hard, dry or lumpy
- pass stools that look like small pellets or rabbit droppings
- seem to be straining or in pain when trying to have a bowel movement
- have a stomach ache that eases after they poo
- have a reduced appetite without another obvious reason
- show any bleeding during or after a bowel movement, which can happen when hard stools cause small tears
If you notice any of these signs in your baby, it is worth speaking to your GP or health visitor sooner rather than later. NHS guidance is clear that getting help early matters, because the longer constipation continues, the harder it can become to bring things back to normal.
Common causes in babies
There is rarely a single reason why a baby becomes constipated. A number of things can play a part, and understanding them can help you work out what might be going on for your baby.
Not enough fluid
Babies who are not getting enough fluids can produce harder, drier stools. For breastfed babies who have not yet started solids, offering more frequent feeds is the approach recommended by the NHS. For formula-fed babies, the NHS advises offering cooled boiled water between feeds as an additional source of fluid, particularly for babies under 6 months who should not have other fluids yet.
Too little fibre once solids are introduced
Once a baby starts solid foods (usually around 6 months), what they eat starts to have a bigger influence on their bowel movements. A diet without enough fruit and vegetables means less fibre, and fibre plays an important role in keeping stools soft and easy to pass. The NHS recommends offering a variety of foods including plenty of fruit and vegetables as part of a balanced approach to weaning.
A change in routine or diet
Any shift in a baby's usual routine can affect their digestive system. Moving from breastmilk to formula, starting solids, or changes in the amount or type of food they are eating can all temporarily alter how their gut works. This kind of constipation often settles once the body adjusts.
Pain creating a difficult cycle
Once a baby has experienced a painful bowel movement, they may instinctively hold back the next one to avoid the same discomfort. This holding back makes the stool sit in the bowel longer, where more water is absorbed from it, making it harder still. The result is a cycle that can be difficult to break without support. This is one of the reasons the NHS recommends seeking help early rather than waiting to see if it resolves on its own.
What you can do to help
There are some practical steps parents can take at home, depending on the baby's age and feeding stage.
Keep up with fluids
For a breastfed baby who has not yet started solids, the main approach is to offer more frequent breastfeeds. Breastmilk contains exactly the right balance of nutrients and water for young babies, and feeding more often is the most appropriate way to increase fluid intake at this stage.
For formula-fed babies, the NHS advises offering cooled boiled water between feeds. This is in addition to their usual formula, not instead of it.
Offer a varied diet rich in fruit and vegetables
Once your baby has started solids, including a good variety of fruit and vegetables in their meals makes a practical difference. These foods are a natural source of fibre, which helps keep stools softer and easier to pass. Variety matters too, both for fibre intake and for helping your baby develop a broad palate.
Encourage movement
Physical activity supports regular bowel function at every age. For babies, this means floor time and movement appropriate to their stage of development. Even gentle movement can help things along.
Stay calm and reassuring
The NHS notes that it is important to stay calm and reassuring around toileting. Babies and young children can pick up on stress, and if going to the toilet becomes an anxious event it can make things harder. Making the experience as relaxed as possible helps.
When to see a GP
If you think your baby may be constipated, NHS guidance recommends taking them to a GP. This is particularly important if:
- home measures are not helping
- your baby seems to be in significant pain or discomfort
- you notice blood in the stool or when wiping
- constipation has been going on for more than a few days
- your baby's appetite is noticeably reduced alongside other symptoms
A GP may recommend a laxative suitable for babies eating solids, used alongside dietary and lifestyle changes. The NHS is clear that treatment can sometimes take several months to fully resolve the problem, but continuing with the recommended approach does work. A GP may also advise keeping a baby on laxatives for a period after things have improved, to make sure stools stay soft enough to pass comfortably.
If your baby is older and laxative treatment leads to what is sometimes called overflow soiling (where runny stools leak around constipated stool), the NHS notes this can temporarily get worse before it gets better, and to keep going with the treatment plan.
Your health visitor is also a good first point of contact and can offer guidance or refer you on if needed.
Frequently asked questions
How do I know if my baby is constipated?
Signs to look out for include doing fewer than 3 poos in a week, passing stools that are large, hard, or pellet-like, straining or seeming in pain when trying to poo, a stomach ache that eases after a bowel movement, and a reduced appetite. If you are unsure, speaking to your health visitor or GP is always a good step.
What can I do at home to help a constipated baby?
For breastfed babies who have not yet started solids, offering more frequent breastfeeds can help. For formula-fed babies, offering cooled boiled water between feeds is advised by the NHS. Once your baby is eating solids, a varied diet with plenty of fruit and vegetables supports regular bowel movements.
When should I take my baby to a GP about constipation?
The NHS advises seeing a GP if you think your baby may be constipated. Getting help early matters because the longer constipation continues, the harder it can be to get bowel movements back to normal.
Can constipation cause other problems for my baby?
If constipation continues, a cycle can develop where the baby holds back to avoid discomfort, which in turn makes things worse. Hard stools can also cause small tears that lead to bleeding. A GP can advise on appropriate treatment to break this cycle.
How long does treatment for constipation take to work?
According to NHS guidance, treatment can sometimes take several months to fully resolve constipation. It is important to keep going with the recommended approach and to follow up with your GP if things are not improving.
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