Constipation in babies

0–6 months · health · Reviewed 18 June 2026 · All articles

Constipation in babies

Watching your baby strain, cry, and go red in the face during a nappy change is one of the more distressing experiences of early parenthood. Your instinct to help is completely natural, but before you reach for any remedy it helps to know what you are actually dealing with. Constipation in babies looks and works differently from constipation in adults, and the range of what counts as normal is surprisingly wide. This guide walks through how to tell real constipation from ordinary variation, what causes it, what you can safely do at home, and the warning signs that mean a trip to the doctor.

What counts as normal for baby bowel habits?

One of the first things most new parents notice is that babies vary enormously in how often they poo, and the same baby can change pattern from week to week. The NHS is clear that there is no single "correct" frequency: some healthy babies pass a stool after every feed, while others, particularly breastfed babies, can go for a week or even longer without a bowel movement and still be completely fine.

Breastfed babies tend to have softer, more mustard-yellow stools and may poo very infrequently after the first few weeks once their gut starts absorbing breast milk more efficiently. This is not constipation. Formula-fed babies usually go more often, typically once or more per day, but some go every two to three days. Both patterns can be normal as long as the stool, when it comes, is soft and passes without obvious distress.

What matters more than frequency is the consistency and appearance of the stool, and whether your baby seems comfortable overall. A baby who goes once every three days but produces a soft, easily passed stool is not constipated. A baby who strains to pass hard, dry, pellet-like stools every day is.

Newborn babies, in the first 24 to 48 hours of life, should pass meconium: a dark, sticky, greenish-black substance that has been building in the bowel during pregnancy. According to the AAP, if a newborn has not passed meconium within 48 hours of birth, this needs urgent medical review, as it can occasionally signal an underlying problem such as Hirschsprung's disease.

How to recognise constipation in your baby

True constipation in babies is about the quality of the stool, not just the timing. The NHS lists the following as signs that your baby may be constipated.

It is worth distinguishing constipation from normal newborn straining. Young babies have to work quite hard to co-ordinate their muscles when passing a stool, and many will go red, grunt, and appear to strain even when the resulting poo is perfectly soft. This is sometimes called "infant dyschezia" and is not constipation. It usually resolves on its own within the first few months as the baby develops better neuromuscular co-ordination.

If your baby passes a soft stool after straining, they are almost certainly not constipated. If the stool is hard when it finally comes, that is more meaningful.

Common causes of constipation in young babies

Understanding why constipation happens can help you tackle the root cause rather than just managing symptoms.

Formula feeding

Formula-fed babies are more prone to constipation than breastfed babies. Breast milk is almost entirely digested and absorbed, leaving very little residue, and the small amount of stool it produces is naturally soft. Formula, by contrast, contains proteins and fats that are slightly harder to process, producing a firmer stool. The type of formula can also matter: some babies do better on one brand or formulation than another, though you should always speak to your health visitor or doctor before switching.

If you are formula-feeding, make sure you are making up feeds using exactly the right ratio of powder to water. Adding too much powder produces a feed that is too concentrated, which can draw water out of the bowel and lead to harder stools. Never add extra powder "to make a more filling feed."

Introduction of solid foods

According to the NHS, constipation can become more common when babies start solid foods, typically around six months of age. A baby's gut has been used to processing only milk and suddenly encounters a wider range of textures, fibres, and proteins. Some foods, in particular bananas, rice cereal, and cooked carrots, are associated with firmer stools. If your baby becomes constipated after starting solids, review what you are offering and try increasing pureed fruit or vegetables with higher water content, such as pear, peach, or cooked broccoli.

Not getting enough fluids

Dehydration is a significant contributor to constipation at any age. In young babies under six months, breast milk or formula provides all the fluid they need, and water should not be given routinely (see our article on water for babies). However, in hot weather or when a baby has a fever, they may need more frequent feeds to stay adequately hydrated. After six months, small amounts of water alongside solid foods can help keep stools soft.

Illness and temporary changes

A baby who is unwell with a fever or who has been vomiting may become temporarily constipated because they are losing more fluid than usual. This is usually short-lived and resolves as the baby recovers and feeds improve. Any change in routine, travel, or even a growth spurt can temporarily affect bowel habits.

Rare medical causes

In a small number of cases, persistent constipation has an underlying medical cause, such as Hirschsprung's disease (a condition in which part of the bowel lacks the nerve cells needed to move stools along), hypothyroidism, or an anatomical issue. These are uncommon but are worth ruling out if your baby has constipation from very early on or does not respond to the usual measures. Your doctor can assess this.

What you can safely do at home

There are several gentle measures recommended by the NHS and the AAP that are safe to try at home before seeking medical advice. None of them involve medication, and they are all things you can do yourself.

Tummy massage

Gentle massage can help stimulate movement in the bowel. Lay your baby on their back on a safe flat surface and, using two or three fingers, massage their tummy in small, gentle clockwise circles. Work outwards from the navel. Clockwise follows the natural direction of the large intestine, which runs up the right side of the abdomen, across the top, and down the left. Do this for a few minutes, several times a day. Many babies find it soothing as well as helpful.

Bicycle legs

With your baby lying on their back, gently hold their legs and move them in a slow cycling motion, as if they were pedalling a bicycle. This helps engage the abdominal muscles and can stimulate a bowel movement. Alternate between the cycling motion and gently pressing their knees up toward their tummy, which mimics the position babies naturally adopt when trying to pass a stool.

A warm bath

A warm bath can help relax your baby's muscles and relieve discomfort. Some babies pass a stool during or shortly after a warm bath. Even if they do not, the warmth can ease the pain and distress that constipation causes, which helps both of you feel a little better.

Extra feeds or fluids

If your baby is breastfed, offering more frequent feeds gives them more fluid, which can soften stools. If they are formula-fed, make sure each bottle is made up correctly and that you are not offering concentrated feeds. For babies over six months who are eating solids, offering small sips of water throughout the day is appropriate and can help.

High-fibre fruits and vegetables for older babies

Once your baby is established on solid foods, you can try offering pureed pear, prune, or peach, which are naturally higher in sorbitol and can have a gentle stool-softening effect. The AAP notes that prune juice diluted with water has been used for constipation in older infants, but you should discuss this with your health visitor or doctor before trying it in a young baby.

What NOT to do

Never give your baby laxatives, suppositories, glycerine enemas, or any adult or over-the-counter constipation remedy without first speaking to a doctor or health visitor. Some of these can cause cramping, diarrhoea, or electrolyte imbalances that are dangerous in small babies. Do not add sugar, syrup, or any other substance to your baby's bottle to try to ease constipation. Do not switch formula brands repeatedly without medical guidance, as this can cause further digestive upset.

When to seek medical advice

Most cases of constipation in babies are short-lived and respond well to the home measures described above. However, there are situations where you should contact your doctor, midwife, or health visitor without delay.

Your doctor may prescribe an infant-safe stool softener such as lactulose if they judge it is needed. These are gentle osmotic laxatives that work by drawing water into the bowel, softening the stool without causing cramping. They should only be given under medical supervision in babies this young. If an underlying cause is suspected, your doctor may arrange further investigations.

Trust your instincts. You know your baby better than anyone. If something feels wrong, getting it checked is always the right call, even if it turns out to be nothing serious. A health visitor or GP would always rather reassure you than have you worry at home.

Track every nappy from day one

Keeping a log of your baby's bowel habits makes it so much easier to spot patterns, know when something has changed, and give your doctor accurate information when your baby arrives.

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Frequently asked questions

How often should a baby poo?

There is a wide range of normal. Breastfed babies may poo after every feed or only once a week, and both can be perfectly fine. Formula-fed babies tend to poo more regularly, usually once or more a day, though some healthy babies go every two to three days. Frequency alone is not a reliable sign of constipation. What matters more is the consistency of the stool and whether your baby is comfortable.

What does constipation look like in a baby?

Constipated babies pass stools that are hard, dry, and pellet-like. They may strain, go red in the face, or seem uncomfortable or distressed during a bowel movement. The stools may be difficult or painful to pass and can occasionally show a small streak of blood from a tiny skin tear around the anus, called an anal fissure, caused by the effort of passing a hard stool.

Can I give my baby laxatives for constipation?

No. You should never give a baby laxatives, suppositories, or any over-the-counter constipation medicine without first speaking to your doctor or health visitor. Some remedies that are safe for adults or older children can be harmful to young babies and cause serious side effects. Always seek professional advice before giving any medication to a baby under six months, or any baby you are concerned about.

Does tummy massage really help baby constipation?

Gentle tummy massage can help stimulate the bowel and ease discomfort. The NHS recommends gently massaging your baby's tummy in a clockwise direction using two or three fingers, working out from the navel. You can also try the bicycle legs exercise, where you gently move your baby's legs in a slow cycling motion while they lie on their back. These are safe, comforting, and worth trying before any other intervention.

When should I take my baby to the doctor for constipation?

See your doctor if your baby has not passed a stool for longer than a week, if there is blood in the stool, if your baby seems to be in significant or persistent pain, if they have a swollen or hard tummy, if they are not feeding well, or if you are concerned at any point. Newborns who have not passed meconium within 48 hours of birth should be seen urgently. Do not hesitate to call if something feels wrong.

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