About the Rome IV Criteria for Paediatric Functional Constipation
Two of six, held for one month. In children of developmental age four years and over the six items are: two or fewer defecations in the toilet per week; at least one episode of faecal incontinence per week; retentive posturing or excessive volitional stool withholding; painful or hard bowel movements; a large faecal mass in the rectum; and large-diameter stools that can block the toilet. The child/adolescent version adds three gates the infant version does not — the items must occur at least weekly, criteria for irritable bowel syndrome must be insufficient, and other conditions must have been excluded. One month is the qualifying period, not the three months the adult criteria require, and that difference is deliberate.
Formula
Infant / toddler (G7) = ≥ 2 of 7 items
AND duration ≥ 1 month
Child / adolescent (H3a) = ≥ 2 of 6 items
AND duration ≥ 1 month
AND items occur at least once per week
AND insufficient criteria for irritable bowel syndrome
AND not fully explained by another medical condition- Two of the listed items
- A count, not a weighting. No item carries more diagnostic weight than another, although a large faecal mass and toilet-blocking stools are the most specific in practice.
- One month
- Halved from Rome III's two months. The reasoning was that the retention cycle self-reinforces, so a long qualifying period delays treatment at exactly the point where it is most effective.
- Developmental age ≥ 4 years
- Developmental, not chronological. A child with global developmental delay is assessed against the infant criteria regardless of birthday.
- Insufficient criteria for IBS
- Present only in H3a. Where abdominal pain resolves as the constipation is treated, this is functional constipation; where pain persists independently, it is IBS with constipation.
- One month in both paediatric bands, against three months in the adult functional constipation criteria.
- Rome III required two months; Rome IV halved it and removed the requirement for the child to be at least four years old for the older criteria to apply.
- 'In the toilet' qualifies the frequency item in H3a but not in G7.
- A rectal examination is not required by the criteria and is not needed in most children.
Interpreting the result
Meeting criteria means starting treatment, and treatment has two phases that must not be collapsed into one. Disimpaction comes first where there is a significant faecal mass, using high-dose oral polyethylene glycol; skipping it and going straight to a maintenance dose is the commonest cause of apparent treatment failure, because a maintenance dose cannot shift an established impaction and the soiling continues while the family loses confidence. Maintenance follows, and it needs to be prolonged — months at minimum, often longer, with the dose titrated to soft stool rather than to a fixed prescription. Stopping as soon as things improve is the second commonest cause of failure. Alongside the drug, the behavioural component needs addressing: unhurried toilet sitting after meals to exploit the gastrocolic response, adequate foot support so the child can generate abdominal pressure, and a reward system oriented towards sitting rather than towards producing a stool. Explain to the family and, in age-appropriate terms, to the child that soiling is involuntary. Where criteria are not met, or where alarm features are present, the picture changes: delayed passage of meconium beyond forty-eight hours, ribbon stools, failure to thrive, bilious vomiting, abdominal distension, an abnormal anal position or tone, a sacral dimple or tuft, or a lower-limb neurological abnormality all point away from functional constipation and towards Hirschsprung disease, a spinal cord anomaly, hypothyroidism, coeliac disease or an anorectal malformation.
| Score | Band | What it means | Action |
|---|---|---|---|
| ≥ 2 items, ≥ 1 month (with band gates satisfied) | Functional constipation | Rome IV criteria met — functional constipation is the diagnosis in the great majority of constipated children | Disimpact if a mass is present, then prolonged maintenance polyethylene glycol plus toileting behaviour work |
| ≥ 2 items with faecal incontinence present | Functional constipation with overflow incontinence | Retention advanced enough that stool is tracking around an impacted mass | Disimpaction is essential before maintenance; state explicitly to family and child that the soiling is involuntary |
| ≥ 2 items but IBS criteria also satisfied (H3a) | Consider IBS with constipation | Abdominal pain that does not resolve as the constipation is treated | Assess against the paediatric IBS criteria; treatment differs beyond laxatives alone |
| Criteria not met, or alarm features present | Not functional constipation | Delayed meconium, ribbon stools, faltering growth, distension, or abnormal spine or neurological examination | Investigate for Hirschsprung disease, spinal anomaly, hypothyroidism, coeliac disease or anorectal malformation |
What the Paediatric Functional Constipation needs (7 inputs)
- Two or fewer defecations in the toilet per week (developmental age ≥ 4 years)
- The child/adolescent wording specifies 'in the toilet', which matters — a child passing stool into underwear several times a day can still satisfy this item, and frequently does. The infant list simply reads two or fewer defecations per week.
- At least one episode of faecal incontinence per week
- Overflow soiling around a retained mass. Its presence on a constipation item list is the single most useful teaching point in these criteria. In the infant list this item applies only after toileting skills have been acquired.
- History of retentive posturing or excessive volitional stool retention
- Stiffening, crossing the legs, standing on tiptoe, hiding, or clenching the buttocks. Families almost always describe this as straining to push, which is the opposite of what is happening, so it needs asking about specifically.
- History of painful or hard bowel movements
- Pain is the engine of the whole cycle. One painful stool teaches a child to withhold, withholding hardens the next stool, and the next one hurts more.
- Presence of a large faecal mass in the rectum
- Established by abdominal palpation, or by rectal examination where that is justified. Rome IV does not require a rectal examination, and in most children the diagnosis can be made without one.
- History of large diameter stools which can obstruct the toilet
- A concrete question families answer reliably — 'have you ever had to break it up or has it blocked the toilet' — and one that identifies a megarectum without any examination.
- Gates applying to the child/adolescent band only: weekly frequency, insufficient IBS criteria, and other conditions excluded
- Three additional requirements in H3a that the infant criteria (G7) do not carry. The IBS exclusion is the one that changes management most often.
What it returns
- Criteria met or not met
- Two or more items, plus the one-month duration and, in the older band, the three additional gates.
- How many items are satisfied
- Reported explicitly. The count is not a severity score, but it does show how close a child sits to the threshold.
- Which age band's criteria were applied
- G7 for infants and toddlers up to four years, H3a for children of developmental age four and above.
How it is calculated
Functional constipation in childhood is a behavioural cycle built on a physiological substrate, and the criteria are constructed around that cycle rather than around transit measurements. It begins with one hard or painful stool — often at a transition point such as weaning, toilet training, starting school, or an illness with reduced intake. The child learns that defecation hurts and begins to withhold, which is an active process involving contraction of the pelvic floor and external sphincter against the urge, and which families consistently mistake for straining. Withheld stool sits in the rectum, water continues to be reabsorbed, and the mass becomes larger and harder, so the next passage is more painful than the last. Over weeks the rectum accommodates to the enlarged volume, sensation of the urge diminishes, and the child stops registering the need to go at all. At that point looser stool from above begins to track around the impacted mass and leaks without the child's awareness, which is what presents as soiling. The child genuinely does not feel it happening, and the frequent assumption that they must have noticed is both wrong and damaging. Each element of the criteria maps onto a stage of this sequence: painful stools at the start, retentive posturing in the middle, large-diameter stools and a palpable mass once the rectum has stretched, and incontinence at the end.
Facts & figures
| Requirement | Infant / toddler (G7) | Child / adolescent (H3a) |
|---|---|---|
| Items required | 2 of 7 | 2 of 6 |
| Duration | 1 month | 1 month |
| Items must occur weekly | No | Yes |
| IBS exclusion stated | No | Yes |
| Other conditions excluded | Not stated explicitly | Yes |
| Frequency item wording | Two or fewer defecations per week | Two or fewer defecations in the toilet per week |
| Incontinence item | Applies only after toileting skills acquired | At least one episode per week, unconditional |
| Age basis | Up to 4 years | Developmental age ≥ 4 years |
The 'in the toilet' qualifier in H3a is easy to overlook and materially changes who qualifies — a child soiling daily but rarely producing a stool in the toilet satisfies the frequency item.
| Error | What happens | Correction |
|---|---|---|
| Maintenance without disimpaction | A maintenance dose cannot clear an established mass; soiling continues and the family concludes laxatives do not work | Disimpact first with high-dose oral polyethylene glycol, then step down |
| Stopping maintenance too early | The rectum has not recovered its calibre or sensation; retention restarts within weeks | Continue for months, titrated to soft stool, and wean slowly rather than stopping |
Both errors are about duration and dose rather than drug choice, which is why switching agents rarely helps.
Evidence
Derivation — Rome Foundation paediatric committees
2016Consensus criteria from the Rome IV committees on childhood functional gastrointestinal disorders, published in Gastroenterology in 2016 as separate neonate/toddler and child/adolescent chapters.
Consensus-derived. The substantive changes from Rome III were halving the duration requirement from two months to one, and removing the requirement that a child be at least four years old before the older criteria could be applied.
Guideline — ESPGHAN / NASPGHAN evidence-based recommendations
2014Joint evidence-based guideline on the evaluation and treatment of functional constipation in infants and children, developed by ESPGHAN and NASPGHAN.
Recommends polyethylene glycol as first-line for both disimpaction and maintenance, and advises against routine radiography and routine rectal examination in children meeting clinical criteria.
How it compares
Paediatric Functional Constipation vs Non-retentive faecal incontinence
The presence or absence of retention decides it, and getting it wrong means giving laxatives to a child who has no stool to shift.
Both present with a school-aged child soiling their underwear, and the distinction cannot be made from the soiling alone. Functional constipation with overflow comes with the retention features — infrequent defecation, painful or large stools, withholding behaviour, a palpable mass. Non-retentive faecal incontinence has none of them: stool frequency and consistency are normal and there is no retention, which Rome IV requires to be absent. The treatments diverge completely. Laxatives are the mainstay of one and are useless in the other, where the work is behavioural and often psychological. Where a child has been on escalating laxative doses without improvement and never had a demonstrable mass, this is the diagnosis to revisit.
Paediatric Functional Constipation vs Paediatric irritable bowel syndrome
Rome IV settles the overlap explicitly — H3a requires that criteria for IBS are insufficient, so IBS takes precedence when both could apply.
A constipated child with abdominal pain could plausibly be given either label, and Rome IV resolves it by building the exclusion into the constipation criteria rather than leaving it to judgement. The practical discriminator is what happens to the pain during treatment: where it resolves as the constipation is cleared, functional constipation was the diagnosis; where it persists independently of stool frequency and consistency, IBS with constipation fits better. That distinction matters because IBS brings interventions beyond laxatives, and because continuing to escalate laxatives against pain that is not retention-driven achieves nothing.
Paediatric Functional Constipation vs Hirschsprung disease
The organic diagnosis these criteria must never mask, and the discriminators are almost all historical or on examination rather than in the stool pattern.
Hirschsprung disease is far less common than functional constipation but is the consequence of getting this wrong. The features that separate it are delayed passage of meconium beyond forty-eight hours, onset in the neonatal period rather than around a transition such as toilet training, ribbon-like stools, abdominal distension, faltering growth, absent withholding behaviour, absent soiling, and an empty rectum with a tight anal canal on examination. Functional constipation characteristically starts later, involves active withholding, produces large stools rather than narrow ones, and is associated with overflow soiling. Where the history points to the neonatal period, or where the child has never had a comfortable pattern to return to, referral for rectal biopsy is appropriate rather than a further laxative trial.
Pearls & pitfalls
- Soiling is overflow, not behaviour. It is on the item list for constipation precisely because it is so often managed as a behavioural problem instead.
- The child cannot feel the soiling happening. Saying this explicitly to the family, in front of the child, changes the dynamic more than any prescription.
- Retentive posturing looks like straining. Families describe a child pushing; ask specifically about stiffening, leg-crossing, tiptoeing and hiding.
- Disimpact before maintaining. A maintenance dose will not clear an established mass, and the resulting 'failure' costs the family's confidence.
- Treat for months, not weeks, and wean rather than stop. Early cessation is the commonest cause of relapse.
- One month, not three. Applying the adult duration rule delays treatment during the period when it works best.
- 'In the toilet' qualifies the frequency item in the older band — a child soiling daily may still meet it.
- Developmental age, not chronological age, decides which item list applies.
- A rectal examination is not required by the criteria and is not needed in most children; abdominal palpation and the toilet-blocking question usually suffice.
- Delayed meconium beyond forty-eight hours, ribbon stools or an abnormal sacrum move this out of functional territory — check the back and the anal position.
- In the older band, ask whether pain resolves as constipation is treated. Persistent independent pain points to IBS rather than functional constipation.
Critical actions
- Establish stool frequency, consistency and calibre, and ask directly whether stools have ever blocked the toilet.
- Ask specifically about withholding behaviours rather than about straining.
- Ask about soiling explicitly — families frequently do not volunteer it and children rarely do.
- Palpate the abdomen for a faecal mass; reserve rectal examination for cases where the diagnosis is genuinely uncertain.
- Examine the lumbosacral spine, anal position and tone, and lower-limb neurology.
- Confirm meconium was passed within forty-eight hours of birth.
- Plot growth — faltering growth is not a feature of functional constipation.
- Disimpact with high-dose oral polyethylene glycol where a mass is present, before starting maintenance.
- Prescribe maintenance polyethylene glycol titrated to soft stool, and set the expectation of months of treatment at the outset.
- Set up unhurried post-meal toilet sitting with proper foot support, and reward sitting rather than stool production.
- State to the family and the child that the soiling is involuntary.
- Arrange planned review rather than as-required follow-up, and use it to check adherence and titrate rather than to stop.
Why this score exists
Halving the duration requirement is the most consequential thing Rome IV did to this definition, and the rationale is worth stating because it inverts the usual logic of diagnostic criteria. Qualifying periods normally exist to protect against overdiagnosis — wait long enough and self-limiting problems declare themselves. The paediatric committees judged that constipation does not behave that way in children. Withholding is self-reinforcing: each retained stool enlarges and hardens the next, the rectum accommodates, sensation is lost, and by the time a two-month threshold has elapsed a child who could have been treated with a short course of laxative may need disimpaction and months of maintenance. The committee concluded that the harm of waiting exceeded the harm of treating a child who might have resolved anyway, and shortened the period accordingly. Keeping faecal incontinence on the item list reflects the same instinct — naming overflow as a feature of constipation rather than a separate behavioural problem is what stops it being managed as one.
About the creator
First author, Rome IV child/adolescent functional gastrointestinal disorders committee
Led the committee producing the child and adolescent criteria (H3a).
First author, Rome IV neonate/toddler functional gastrointestinal disorders committee
Led the committee producing the infant and toddler criteria (G7), and has published extensively on childhood constipation.
Co-author; paediatric neurogastroenterology and motility
Contributed to the child and adolescent chapter of Rome IV.
Limitations
- Consensus criteria with no external validation, and the two-of-six threshold is a convention rather than a derived cut-off.
- No severity grading, so a child with mild infrequency and one with a megarectum and daily overflow receive the same diagnosis.
- 'Large diameter' and 'large faecal mass' are not quantified and depend on the observer.
- The one-month duration was shortened on reasoning rather than on trial evidence comparing outcomes at one versus two months.
- Dependent on caregiver report for most items, and soiling in particular is under-reported through embarrassment.
- The infant criteria do not state an exclusion for other medical conditions, although one is clearly intended.
- Nothing in the criteria distinguishes a child in the early withholding phase from one with an established megarectum, though the treatment burden differs greatly.
- The IBS exclusion appears only in the older band, leaving the overlap unaddressed in toddlers.
- No guidance on when failure to respond should prompt investigation rather than dose escalation.
If you are the patient
Functional constipation means a child who does not empty their bowels often enough or comfortably enough, and where there is no underlying disease causing it — which is true for almost every constipated child. It usually starts with one stool that hurt. That is enough to teach a child, quite sensibly, to avoid doing it again, and they begin holding on. You may see this as stiffening, crossing legs, going up on tiptoe, hiding in a corner or going very still — it often looks like pushing, but it is the opposite. The problem is that held-on stool gets bigger and harder while it waits, so the next one hurts more, and the cycle tightens. If this continues, the lower bowel stretches and the child stops feeling the urge at all. At that stage softer stool from higher up leaks around the hard lump, and this is the soiling that many families see. The most important thing to understand is that your child cannot feel this happening and is not doing it deliberately. It is not laziness, naughtiness or going backwards, and telling them off for it will not help and will make them more ashamed. Treatment usually means a medicine called polyethylene glycol (macrogol). If there is a hard lump to clear, a higher dose is used first for a few days — this is called disimpaction, and it can make the soiling worse briefly before it gets better. After that a smaller daily dose keeps things soft. Two things matter more than which medicine is used: clearing the lump before starting the regular dose, and carrying on with the regular dose for months rather than weeks. Stopping as soon as things look better is the usual reason the problem comes back. Alongside the medicine, sitting on the toilet unhurried for a few minutes after meals helps, and so does a footstool so your child can push properly. Reward the sitting, not the result.
Frequently asked questions
What are the Rome IV criteria for functional constipation in children?#
In children of developmental age four and over, two or more of: two or fewer defecations in the toilet per week; at least one episode of faecal incontinence per week; retentive posturing or excessive volitional stool retention; painful or hard bowel movements; a large faecal mass in the rectum; and large-diameter stools that can obstruct the toilet. These must be present for at least one month, occur at least weekly, with insufficient criteria for irritable bowel syndrome and no other explanation. Infants and toddlers up to four use a similar seven-item list without the weekly, IBS and exclusion gates.
Why is the duration one month rather than three?#
Because withholding is self-reinforcing. Each retained stool becomes larger and harder, so the next is more painful, and over time the rectum stretches and the child loses the sensation of needing to go. Rome IV halved the Rome III requirement from two months on the reasoning that a long qualifying period delays treatment precisely when it is most effective and least burdensome. The adult criteria still use three months.
Why is soiling listed as a sign of constipation?#
Because it usually is one. When a hard mass sits in the rectum, softer stool from above tracks around it and leaks without the child noticing, since the stretched rectum no longer signals. Listing faecal incontinence among the diagnostic items is Rome IV's way of stopping overflow being managed as a behavioural problem. The child genuinely cannot feel it happening, and saying so explicitly to the family is part of the treatment.
Is a rectal examination needed to make the diagnosis?#
Usually not. Rome IV does not require one, and the ESPGHAN/NASPGHAN guideline advises against performing it routinely in children who meet clinical criteria. Abdominal palpation for a faecal mass, together with the history — particularly whether stools have ever blocked the toilet — is generally sufficient. It is reserved for cases where the diagnosis is genuinely uncertain.
Why does treatment often seem to fail?#
Almost always for one of two reasons, and neither is the choice of drug. The first is starting maintenance without disimpacting: a maintenance dose cannot shift an established mass, so soiling continues and the family loses confidence in the treatment. The second is stopping too soon, before the rectum has recovered its calibre and sensation, which lets retention restart within weeks. Treatment should run for months, be titrated to soft stool, and be weaned rather than stopped.
What distinguishes this from non-retentive faecal incontinence?#
Retention. Functional constipation with overflow comes with infrequent, painful or large-calibre stools, withholding behaviour and often a palpable mass. Non-retentive faecal incontinence has normal stool frequency and consistency and no retention at all. The distinction is important because laxatives are central to one and useless in the other, where the work is behavioural.
What are the red flags that argue against a functional diagnosis?#
Delayed passage of meconium beyond forty-eight hours, onset in the neonatal period, ribbon-like stools, faltering growth, abdominal distension, bilious vomiting, an abnormal anal position or tone, a sacral dimple or hair tuft, and lower-limb neurological abnormality. These point towards Hirschsprung disease, a spinal cord anomaly or an anorectal malformation, and warrant investigation rather than a further laxative trial.
Does developmental delay change which criteria apply?#
Yes. The older item list applies from a developmental age of four years, not a chronological age of four. A child with global developmental delay is assessed against the infant and toddler criteria regardless of their birthday, which matters because that list omits the weekly-frequency, IBS and exclusion gates.
References
Original / primary reference
- Hyams JS, Di Lorenzo C, Saps M, Shulman RJ, Staiano A, van Tilburg M. Childhood Functional Gastrointestinal Disorders: Child/Adolescent. Gastroenterology. 2016;150(6):1456-1468 (Rome IV).
- Benninga MA, Nurko S, Faure C, Hyman PE, St James Roberts I, Schechter NL. Childhood Functional Gastrointestinal Disorders: Neonate/Toddler. Gastroenterology. 2016;150(6):1443-1455 (Rome IV).