Child Constipation, Poo Withholding and Toilet Training: What Parents Need to Know

Some kids go to the toilet three times a day. Some go a few times a week. Some children seem completely fine until toilet training starts, and suddenly poo becomes a big, stressful, tearful, avoid-at-all-costs situation.

So when is it constipation?

And when is it something more than “they just don’t want to go”?

Constipation in children is not only about how often a child poos. This is one of the biggest myths we see at Super Kids. A child can poo every day and still be constipated. A child can have poo accidents and still be constipated. A child can look like they have diarrhoea, but actually be experiencing overflow from stool retention.

This is why we need to look at the full picture.

What is functional constipation?

In paediatric gastroenterology, the current Rome V criteria describe functional constipation as a disorder of gut–brain interaction. That means the problem is real, physical and distressing, but it is not usually caused by a structural issue. In fact, most childhood constipation is functional, meaning it usually develops through a cycle of pain, fear, withholding and harder stools over time. 

The Rome V criteria look for patterns such as:

• two or fewer poos per week
• poo accidents in children who are toilet trained
• withholding behaviours
• painful or hard bowel movements
• large stools
• a large amount of stool sitting in the rectum

A child does not need every sign to be constipated. Rome V only requires a pattern of symptoms, and in children, these symptoms need to be understood in context. 

Poo withholding is not “naughty”

One of the most important things for parents to understand is this:

Poo withholding is usually protective.

Children do not typically hold on to poo because they are trying to be difficult. They hold on because, at some point, pooing became uncomfortable, scary, inconvenient, rushed, pressured or unpredictable.

A child might withhold because a previous poo hurt. They might avoid the toilet because they are scared of the splash, the sound, the smell, the feeling, or the expectation to sit. They might not want to poo at preschool or school. They might be anxious about losing control. They might have had a bad experience during toilet training.

Once a child starts withholding, the poo sits longer in the bowel. The body absorbs more water from it, making it harder and more painful to pass. Then the next poo hurts even more, which teaches the child to hold again.

That is the constipation cycle.

Pain leads to fear. Fear leads to withholding. Withholding leads to harder stools. Harder stools lead to more pain.

Rome V describes this vicious cycle clearly: an unpleasant defecation experience can trigger fear of repeating the experience, which then maintains the pattern of stool retention. 

What does withholding look like?

Withholding does not always look like a child calmly saying, “I need to hold in my poo.”

It can look like:

• crossing legs
• stiffening the body
• hiding behind furniture
• standing on tiptoes
• clenching
• rocking
• refusing to sit on the toilet
• becoming upset when taken to the bathroom
• asking for a nappy to poo
• having tiny smears or skid marks in underwear
• suddenly becoming irritable, silly or avoidant

Many parents mistake withholding for straining. This is understandable, because the body can look like it is trying to push when it is actually trying very hard not to let go.

Poo accidents can still be constipation

This one surprises many families.

If a child has poo accidents, parents may assume the child has diarrhoea, poor awareness or behaviour problems. Sometimes that is true. But very often, poo accidents are related to constipation.

When stool builds up in the rectum, softer stool can leak around the harder stool. This is sometimes called overflow soiling or overflow incontinence. The child may not feel it happening, or may feel it too late.

This is why we need to be careful with blame.

A child who has poo accidents is not necessarily lazy, careless or doing it on purpose. They may have reduced sensation because their rectum has been stretched over time. They may not be receiving the usual body signals that tell them, “It’s time to go.” Rome V clinical examples highlight how children with severe functional constipation and fecal incontinence are often misunderstood as ignoring the problem or soiling intentionally. 

Toilet training and constipation

Toilet training does not cause all constipation, but it can become a major stress point.

If a child is already prone to hard stools, painful poos or withholding, toilet training can make the issue more visible. Suddenly, there are more expectations: sit here, poo here, do it now, tell me before, don’t have an accident, hurry up, use the toilet at preschool.

That is a lot for a little body.

For some children, especially neurodivergent children or children with sensory sensitivities, toileting is not just a simple developmental milestone. It involves body awareness, communication, motor planning, sensory tolerance, predictability, privacy, routine, and trust.

If pooing hurts, behavioural strategies alone will not solve the problem.

Before we can teach a child to poo in the toilet, we need to make pooing feel safe and comfortable again.

What should parents do first?

If your child is withholding, having painful poos, passing large stools, having poo accidents, or avoiding the toilet, the first step is not more pressure.

The first step is assessment.

A helpful starting point includes:

• a bowel diary
• stool consistency tracking (the Bristol Stool Chart is helpful for this) 
• noting accidents, pain and withholding
• reviewing diet, fluids and routines
• speaking with your GP or paediatrician
• considering constipation treatment if clinically indicated

Rome V and paediatric guidelines emphasise that functional constipation is usually diagnosed through history and physical examination, not through routine scans or extensive testing, unless there are alarm signs or the diagnosis is unclear. 

The big takeaway

Constipation is not just “not pooing enough.”

It can be hard stools, painful poos, withholding, toilet refusal, tummy pain, poo accidents, or a child who will only poo in a nappy.

And most importantly: it is not a behaviour problem first.

It is usually a comfort, safety and body-learning problem.

When we reduce pain, reduce pressure, support the body, and rebuild trust with toileting, children have a much better chance of learning the skills we want them to learn.

At Super Kids, we always say: before we ask a child to be independent with toileting, we need to make sure their body is ready, their stools are comfortable, and the bathroom feels safe enough to learn.