Infant constipation and dyschezia

A baby's poo can tell us a lot about their general health. Its colour, consistency and appearance can change as a baby grows, and these changes can be influenced by feeding, digestion and illness. How often a baby passes stool is also useful information, but frequency alone does not determine whether a baby is constipated.

Understanding what is normal, recognising the difference between constipation and infant dyschezia, and looking at bowel movements alongside feeding, hydration and growth can help families know when reassurance is appropriate and when to seek support.

What normal baby poo looks like

A baby's stools change considerably during the first days and weeks of life. These changes are one of several useful indicators of how feeding is progressing.

During the first day or two after birth, babies usually pass meconium. This first stool is dark green or black, sticky and thick. As milk intake increases, the stool changes in colour and consistency.

By around days four to five, stools usually become lighter and looser. Breastfed babies commonly have yellow or mustard-coloured stools that may look grainy or contain small seed-like flecks. Formula-fed babies generally have stools that are firmer, more paste-like and darker in colour. Both can be normal (NHS, 2021; Derbyshire Family Health Service, n.d.).

Green stools

Green poo is not automatically a cause for concern. It can be normal, and some infant formulas can make stools appear dark green. However, green stools can also occur alongside changes in digestion, infection or feeding difficulties.

Green, frothy stools may sometimes occur when a baby is experiencing a high milk flow, oversupply or difficulties transferring milk effectively. Temporary lactose overload can also occur, including after gastroenteritis. These possibilities need to be considered alongside the baby's feeding behaviour, comfort, weight gain and overall wellbeing. Stool colour alone cannot identify the cause (NHS Bath and North East Somerset, Swindon and Wiltshire Integrated Care Board, 2026).

If green stools are persistent or accompanied by diarrhoea, significant discomfort, poor feeding or concerns about growth, seek advice from a health visitor or GP.

Pale, bloody or black stools

Very pale, chalky or white stools are not typical and can indicate a problem with bile flow or the liver. Seek urgent medical advice if you notice them.

Blood in a baby's stool should also be discussed with a healthcare professional, particularly if it is unexplained, recurrent or accompanied by other symptoms. A small streak of bright red blood can sometimes occur when a hard stool causes a small tear around the anus, but this should not be assumed to be the cause without appropriate assessment.

Black, tar-like stools are expected in the first days after birth while a baby passes meconium. Black stools later on, when meconium has passed, need medical assessment unless a healthcare professional has explained another cause.

Feeding, milk intake and growth

Feeding and bowel movements are closely connected. The amount of milk a baby receives, how effectively they transfer it and how well they grow can all help put stool patterns into context.

In the first weeks, stool frequency is a useful indicator of milk intake, particularly for breastfed babies. A breastfed baby aged between four days and six weeks who is feeding well should usually pass at least two yellow stools a day. If there has been no stool for 24–48 hours during this period, speak to a midwife or health visitor because it may indicate that the baby is not receiving enough milk (NHS, 2023a).

After around six weeks, some breastfed babies begin to poo much less frequently. A baby may go several days without a bowel movement, and occasionally longer, while still being well and growing normally. If the stool is soft when it arrives and the baby is feeding and growing well, this is not necessarily constipation.

Formula-fed babies often continue to pass stools more regularly, although patterns vary. If a formula-fed baby is younger than eight weeks and has not passed a stool for two to three days, seek advice from a midwife, health visitor or GP (NHS, 2023b).

Preparing formula safely

Always prepare formula using the exact amount of water and powder specified by the manufacturer. Adding extra powder can make feeds too concentrated, potentially contributing to constipation and dehydration. Adding extra water can make a feed too dilute and may be dangerous.

The volume suggested on formula packaging is a guide, not a target every baby must finish. Babies vary in their needs, and feeding should respond to their cues rather than pressure to finish a bottle.

For an independent guide to infant milk, including how to interpret formula information, see First Steps Nutrition Trust's *Infant milks: a simple guide to infant formula, follow-on formula and other infant milks*, particularly page 18 (First Steps Nutrition Trust, 2024).

Responsive bottle feeding and recognising feeding cues can also help families understand whether a baby is taking enough milk without being encouraged to overfeed. For further information, see What is an IBCLC? Feeding support explained and What does an infant feeding specialist do?.

A holistic approach

Bowel movements should be considered alongside the whole feeding picture, rather than in isolation. Useful information includes:

• How often the baby feeds and how feeds are going.

• Whether the baby appears comfortable during feeding and afterwards.

• Whether milk transfer seems effective and the baby is satisfied after feeds.

• The number of wet nappies and any signs of dehydration.

• Weight gain and the baby's general health.

• Stool colour, consistency, frequency and any changes from the baby's usual pattern.

For breastfed babies, persistent green, frothy stools may be one part of a wider picture involving milk flow, oversupply or milk transfer. It is not possible to diagnose ineffective milk transfer, lactose overload or an allergy from stool appearance alone. A feeding assessment can help identify whether there are difficulties with positioning, attachment, oral function, milk flow or feeding coordination that need support.

Cow's milk protein allergy can sometimes be associated with constipation, but constipation on its own is not enough to establish an allergy. Other symptoms and the baby's clinical history need to be considered before making changes to feeding (NHS Bath and North East Somerset, Swindon and Wiltshire Integrated Care Board, 2026).

Stooling frequency

There is no single bowel movement pattern that is normal for every baby. Frequency changes with age, feeding and the introduction of complementary foods.

In the early weeks, frequent stools are common. After around six weeks, some breastfed babies pass stools much less often. Formula-fed babies may continue to poo daily, but there is individual variation.

The important distinction is between a baby who passes soft stools infrequently and a baby who passes hard, dry or painful stools. The former may be entirely normal; the latter is more suggestive of constipation.

When considering stool frequency, also look at whether the baby is feeding well, producing wet nappies, growing as expected and behaving as usual. A sudden change in pattern or a reduction in stool output alongside other symptoms deserves closer attention.

Keeping a short record of bowel movements, feeding, wet nappies and any associated symptoms can help when discussing concerns with a health visitor or GP.

Recognising constipation

Constipation is more than simply not pooing every day. It usually involves stools that are hard, dry, lumpy or pellet-like, or bowel movements that are painful or difficult to pass.

Other possible signs include:

• Larger or firmer stools than usual.

• Crying or distress when passing a stool.

• A small amount of bright red blood associated with a hard stool.

• A firm or swollen tummy.

• Reduced appetite or being less settled than usual.

A baby may strain, grunt, turn red or cry while passing a soft stool. These behaviours do not necessarily mean they are constipated.

Constipation can occur following a change in feeding, when formula is introduced, when complementary foods begin or when a baby is not receiving enough fluid. Incorrectly prepared formula can also contribute. Sometimes no clear cause is identified (NICE, 2010, updated 2017).

Cow's milk protein allergy is a possible consideration in some babies with constipation, but it is uncommon for constipation to be the only symptom. Do not remove foods from a breastfeeding parent's diet or switch to specialist formula without appropriate advice.

Infant dyschezia: straining without constipation

Infant dyschezia is a term used to describe a young baby who strains and cries for a prolonged period before passing a soft stool, or who strains and cries but does not successfully pass one. The baby may turn red or appear to be pushing very hard.

This can be upsetting to watch, but it does not necessarily mean the baby is constipated. Young babies are still learning to coordinate the muscles needed to increase pressure in the abdomen while relaxing the pelvic floor to allow a bowel movement. Until this coordination develops, they may appear to struggle even when their stool is soft.

Infant dyschezia is recognised in otherwise healthy infants younger than nine months. The diagnostic criteria describe at least ten minutes of straining and crying before a successful or unsuccessful attempt to pass a soft stool. It usually resolves as coordination develops, without medication or other treatment (Rome Foundation, 2016; Benninga et al., 2016).

Comforting the baby, cuddling and gentle movements may help them settle. Avoid trying to make the baby poo by stimulating the rectum. This is not necessary for dyschezia and can cause distress or injury.

If stools are hard, the baby is unwell, feeding is poor or there are other concerning symptoms, do not assume the problem is dyschezia; seek medical advice.

Supporting your baby at home

If your baby is otherwise well, feeding normally, producing wet nappies and passing soft stools, there may be no need to intervene simply because they have not pooed as frequently as expected.

Some gentle measures may help a baby feel more comfortable:

• Gently move their legs in a cycling motion while they are lying on their back.

• Try a gentle tummy massage if your baby is comfortable with it.

• Offer cuddles and comfort when they are unsettled.

• Continue to monitor feeding, wet nappies, stool consistency and growth.

• If your baby has started complementary foods, offer suitable fibre-containing foods such as fruit and vegetables as part of a balanced diet.

These measures may help with comfort, but they do not replace assessment if a baby is genuinely constipated or has symptoms that suggest an underlying problem.

If you are concerned about feeding effectiveness or milk intake, seek feeding support rather than relying on stool frequency alone. The right support depends on the cause of the difficulty.

Water and other home remedies

Babies under six months generally receive the fluid they need from breast milk or correctly prepared infant formula. Do not give extra water, sugar water, fruit juice or herbal remedies to a young baby to try to treat constipation unless a healthcare professional has specifically advised you to do so.

Never add extra water to formula or change the powder-to-water ratio. This can affect the balance of nutrients and salts a baby receives.

For babies who have started complementary feeding, suitable foods and fluids should be offered in line with their age and usual feeding guidance. If constipation persists, seek advice rather than trying repeated home remedies.

Approaches to avoid

Do not insert anything into a baby's rectum to stimulate a bowel movement. This can injure the rectum or bowel, with a risk of serious injury, including perforation. Rectal stimulation is not a treatment for infant dyschezia.

Do not give laxatives, suppositories or enemas unless advised by an appropriate healthcare professional. Some babies with constipation need medication, but the choice and dose depend on their age, symptoms and clinical assessment.

Laxatives work in different ways. Stool softeners help make poo softer and easier to pass, while stimulant laxatives help the bowel contract to move stool along. A healthcare professional can advise whether either type is appropriate and whether further assessment is needed. Dietary changes alone may not be enough to treat established constipation (NICE, 2010, updated 2017; NHS England, 2023).

When to seek medical advice

Speak to your midwife, health visitor or GP if you are worried about your baby's bowel movements, feeding, hydration or growth. Seek advice if stools become hard or painful, there is blood in the stool, your baby is feeding less than usual, or a change in bowel pattern persists.

For a breastfed baby aged four days to six weeks, fewer than two yellow stools a day or no stool for 24–48 hours should prompt a discussion with a midwife or health visitor. If a formula-fed baby is under eight weeks and has not passed a stool for two to three days, seek advice from a healthcare professional (NHS, 2023a; NHS, 2023b).

Other conditions to consider

Constipation that begins at birth or in the first few weeks of life, delayed passage of the first stool, poor growth or a markedly swollen abdomen should not automatically be attributed to ordinary infant constipation. These signs can sometimes indicate an underlying medical condition and require prompt assessment (NICE, 2010, updated 2017; NHS England, 2023).

One such condition is Hirschsprung's disease, in which nerve cells that help move stool through part of the bowel are missing. This can make it difficult for stool to pass. Delayed passage of meconium, abdominal swelling, vomiting and ongoing constipation can be warning signs (NHS, 2017).

Pyloric stenosis is another condition to be aware of in young infants. It is a narrowing at the outlet of the stomach, which prevents milk from passing normally into the small intestine. Repeated, forceful or projectile vomiting is a key symptom; because less milk reaches the bowel, stool output may also reduce. Projectile vomiting in a young baby needs urgent medical assessment (NICE, 2015, updated 2019; Great Ormond Street Hospital for Children NHS Foundation Trust, n.d.).

Seek urgent medical help if your baby has green vomit, repeated projectile vomiting, a very swollen abdomen, marked lethargy, signs of dehydration or is difficult to wake. Contact a healthcare professional promptly if your baby's poo is very pale, there is unexplained blood in the stool, your baby is not feeding normally or you are concerned about their weight gain. If your baby appears seriously unwell, seek emergency help.

Understanding bowel movements means looking beyond how often a baby poos. Stool appearance, feeding effectiveness, hydration, growth and the baby's overall wellbeing all provide important information. If you are unsure, seeking support can help establish whether the pattern is normal, whether constipation needs treatment or whether further assessment is needed.

Anatomy provides information; function provides context.

References

Benninga, M.A. et al. (2016) ‘Childhood functional gastrointestinal disorders: neonate/toddler’, Gastroenterology, 150(6), pp. 1443–1455.e2. Available at: https://doi.org/10.1053/j.gastro.2016.02.016

Derbyshire Family Health Service (n.d.) A guide to your baby’s poo and wee. Available at: https://derbyshirefamilyhealthservice.nhs.uk/our-services/0-5-years/babies-health-and-wellbeing/baby-poo-wee

First Steps Nutrition Trust (2024) Infant milks: a simple guide to infant formula, follow-on formula and other infant milks. Available at: https://www.firststepsnutrition.org/s/Infant-milks-a-simple-guideJuly24_final.pdf

Great Ormond Street Hospital for Children NHS Foundation Trust (n.d.) Pyloric stenosis. Available at: https://www.gosh.nhs.uk/conditions-and-treatments/conditions-we-treat/pyloric-stenosis/

National Institute for Health and Care Excellence (NICE) (2010, updated 2017) Constipation in children and young people: diagnosis and management (CG99). Available at: https://www.nice.org.uk/guidance/cg99

National Institute for Health and Care Excellence (NICE) (2015, updated 2019) Gastro-oesophageal reflux disease in children and young people: diagnosis and management (NG1). Available at: https://www.nice.org.uk/guidance/ng1

NHS (2017) Hirschsprung’s disease. Available at: https://www.nhs.uk/conditions/hirschsprungs-disease/

NHS (2021) How to change your baby’s nappy. Available at: https://www.nhs.uk/baby/caring-for-a-newborn/how-to-change-your-babys-nappy/

NHS (2023a) Constipation and breastfeeding. Available at: https://www.nhs.uk/best-start-in-life/baby/feeding-your-baby/breastfeeding/breastfeeding-challenges/constipation/

NHS (2023b) Constipation and bottle feeding. Available at: https://www.nhs.uk/best-start-in-life/baby/feeding-your-baby/bottle-feeding/bottle-feeding-challenges/constipation-and-bottle-feeding/

NHS Bath and North East Somerset, Swindon and Wiltshire Integrated Care Board (2026) Cow’s milk protein allergy guidelines. Available at: https://bswtogether.org.uk/medicines/wp-content/uploads/sites/3/2026/04/CMPA-BSW-CMPA-Guidelines-Update-Feb-2026.pdf

NHS England (2023) National clinical constipation pathway for primary care for children. Available at: https://www.england.nhs.uk/long-read/national-clinical-constipation-pathway-for-children/

Rome Foundation (2016) Rome IV criteria: childhood functional gastrointestinal disorders. Available at: https://theromefoundation.org/rome-iv/rome-iv-criteria/