What parents need to understand when the laxative helps but the constipation keeps coming back
Medically Reviewed by Bahee Van de Bor, RD, BCAPSc PGDipDiet, Specialist Paediatric Dietitian, former specialist dietitian at Great Ormond Street Hospital, with over 20 years of clinical experience in paediatric digestive health.
Every morning starts the same way.
Have you done a poo?
Did you sit on the toilet?
Did you take your Movicol?
Your child is on laxatives. You are giving them more water, more fruit, more fibre. You’ve done everything you have been told to do.
And yet the constipation keeps coming back.
Sometimes the laxative helps for a while. Stools soften, the stomach settles, and you start to think you have finally cracked it. Then a few weeks later you are back to square one.
Meanwhile, life starts revolving around poo. School mornings become stressful. Holidays require planning. Sleepovers feel impossible. Every family outing begins with the question: when was the last time they went? Constipation slowly becomes the thing running the household.
You start to wonder whether the laxative is even working. Whether you have the dose right. Whether there is something else going on that nobody has explained.
Functional constipation is one of the most common reasons clinicians prescribe laxatives, and one of the most common reasons families end up feeling stuck.
Here is what nobody tells parents.
The laxative may be doing exactly what it is supposed to do. The reason the constipation keeps returning is almost always somewhere else.
Soft stools do not necessarily mean the constipation has resolved
This is the thing that surprises parents most, and it is at the heart of why so many children cycle in and out of constipation for months or years.
A laxative softens the stool and makes it easier to pass. That is its job and it does it well. But softer stools do not automatically mean the underlying constipation has resolved. They mean the stool is softer.
The bowel itself may still be stretched, still lacking normal sensation, still failing to give your child clear signals that it is time to go. The withholding behaviour that developed when passing stools was painful may still be present even though the stool is no longer hard.
Why the Constipation Comes Back
When the laxative dose is reduced or stopped, the constipation returns. Not because the laxative was the only thing keeping it at bay, but because the bowel has not yet had time to recover its normal function.
This is why treating constipation in children is rarely just about the stool. It is about helping the whole system recover.
Or It Could Mean the Constipation Isn’t Fully Treated Yet
It is also worth saying clearly: not every child who remains constipated on laxatives has a bowel that is in the recovery phase.
Some children are still passing hard stools, still withholding, or still not fully emptying their bowel despite being on a laxative.
In these situations the issue may be that the constipation has not yet been adequately treated rather than that treatment has failed.
The dose may be too low, the laxative may have been stopped and restarted repeatedly, or stools may still be harder than they appear.
If your child is still passing Bristol Type 1 or 2 stools despite taking a laxative regularly, it is worth reviewing the treatment with a clinician before assuming the bowel is on its way to recovery.
What happens to the bowel during prolonged constipation
When a child holds on and avoids passing stools, stool builds up in the colon over time. As more stool accumulates, the colon stretches to accommodate it.
A stretched colon becomes less efficient at the contractions that move stool along. The nerve endings that signal fullness become less sensitive. The child stops feeling the urge to go, even when the bowel is full.
This is also why some children pass stools that seem impossibly large for their age. The bowel has been holding stool for so long. Your child can build up a much larger amount before finally passing it.
Think of a bag that has stretched from carrying too much for too long. Even once you empty it, it does not immediately spring back to its original shape.
The bowel needs time, consistency and the right conditions to recover its normal tone and sensitivity. That process takes weeks or months, not days.
You cannot rush it by increasing the laxative dose. It will not happen if you stop the laxative too early.
The too-early weaning trap
This is one of the most common reasons constipation keeps returning, and it happens with the best intentions.
Stools soften. The child starts passing them more regularly. Things seem to be improving. So parents begin to reduce the laxative, or stop it altogether, assuming the problem has gone away.
Within days or weeks the constipation is back.
What has happened is that the bowel looked better on the outside; softer stools, fewer complaints…but had not yet had time to recover its normal function underneath. The moment you reduced the laxative, the old pattern reasserted itself.
I usually recommend laxative treatment for functional constipation in children for several months at minimum. Soft stools do not mean the constipation has resolved. Coming off the laxative too early is one of the most reliable ways to end up back at the beginning.
The constipation sign that looks like diarrhoea
This one catches almost every family off guard.
Some children who appear to have diarrhoea are actually severely constipated.
When stool builds up in the colon over a long period, liquid from higher in the gut can leak around the blockage and pass as what looks like loose stools or soiling.
This is called overflow diarrhoea. The child may soil without any warning or sensation. Parents and sometimes clinicians, treat it as diarrhoea, reducing fibre or restricting foods, when the real problem is the opposite.
If your child has unpredictable loose stools or accidents alongside constipation, or if their pattern seems to alternate between the two, overflow is worth discussing with a specialist before making any dietary changes.
Read my post on Is My Child’s Diarrhoea Actually Constipation?
Why more fibre, fruit and water are often not enough
By the time most families reach my clinic, they have already increased water, increased fruit and increased fibre.
The fact that constipation is still present despite those changes is often a clue that something else is maintaining the cycle.
Fibre and fluid are important for bowel health and they do play a role.
But the type of fibre matters as much as the amount. Some fibres support stool movement while others can contribute to bloating and stomach pain, particularly in children whose gut is already sensitive.
Simply adding more fibre without considering which type is appropriate can sometimes increase discomfort without resolving the underlying problem.
What About Specific Foods Like Dairy, Eggs or Gluten?
Many parents at this stage also start wondering whether a specific food might be the issue. Maybe it is dairy. Or you believe it could be eggs. Maybe it is gluten.
Food can matter, and sometimes a specific dietary factor is contributing.
But when constipation has become established, changing foods alone is rarely enough to break the cycle.
Understanding what is actually maintaining the pattern comes first.
Why withholding keeps happening even when stools are soft
Many children develop withholding behaviour after a painful constipation episode.
Passing a hard, painful stool is frightening for a young child. The instinctive response is to avoid it happening again, so they hold on.
The problem is that withholding can become a deeply ingrained habit that persists long after the stool has softened. Even when passing a stool is no longer painful, the anxiety around it can remain.
The child has learned, at a deep level, that going to the toilet hurts. Unlearning that takes time and the right support.
This is why constipation in children is rarely just a physical problem.
The bowel, the brain and the behaviour are all involved.
Treating only the physical symptoms, with laxatives and fibre, without addressing the withholding pattern is one of the main reasons constipation keeps cycling.
What recovery actually looks like
Recovery from functional constipation is not just about achieving regular soft stools on a laxative. It is about the bowel returning to normal function without constant management.
That means regular, comfortable bowel movements without straining, no soiling or overflow, a child who feels the urge to go and responds to it, confidence and ease around the toilet, and eventually no longer needing a laxative to maintain that pattern.
Part of recovery is also establishing a consistent toileting routine. Creating regular opportunities for the bowel to empty, responding to urges rather than ignoring them, and rebuilding the child’s confidence around the whole process.
Getting there requires a structured approach that addresses the bowel function, the withholding behaviour, the dietary picture, and the timing of any changes. It is not a linear process and it does not happen overnight. But for most children it is absolutely achievable.
Soft stools do not mean the constipation has resolved. The goal is not a child who can poo on Movicol. The goal is a child whose bowel works normally.
When to seek specialist support
It is worth speaking to a specialist if:
- Your child has been on laxatives for more than three months without a clear plan for coming off
- Constipation keeps returning every time the laxative is reduced or stopped
- Your child is still passing hard stools despite taking a laxative regularly
- Your child is soiling or having accidents alongside constipation
- Withholding behaviour is significant and affecting daily life
- You are unsure whether what you are seeing is constipation, overflow or diarrhoea
- Dietary changes have not made a meaningful difference
Red flag symptoms that always need prompt medical review include blood in the stool, poor growth, significant weight loss, or constipation that has been present since birth.
What structured support looks like
In my clinical programme, the Happy Belly Club®, I work with families through a structured 12-week process.
Before I recommend any changes, I look at the full picture: the timeline of the constipation, what you have already tried, your child’s diet and behaviour around toileting, and whether overflow or withholding is part of the pattern. That assessment changes everything, because persistent constipation in children rarely has a single cause and rarely responds to a single fix.
From there we work through the Happy Belly Formula: Identify, Restore, Thrive. For some children that means treating the constipation properly first, rebuilding confidence around going to the toilet second, and only then considering a gradual reduction in laxatives. The sequence matters as much as the intervention.
For many families, this process provides clarity after months or years of cycling in and out of constipation.
If you would like to understand whether this approach is right for your child, you can book a free 15-minute Discovery Call. No pressure. Just a clear conversation about what is going on and whether I can help.
Frequently Asked Questions
Laxatives soften the stool and make it easier to pass, but they do not restore normal bowel function on their own.
If constipation keeps returning, it may mean the bowel has not yet had time to recover its normal tone and sensitivity, you have reduced the laxative too early, or withholding behaviour is continuing alongside treatment.
In some cases, the constipation needs further treatment, and your GP may need to review the laxative dose or type.
Not necessarily. Soft stools mean the laxative is working as intended. But the bowel itself may still be stretched and not yet functioning normally. Many children continue to withhold even when stools are soft, and stopping the laxative too early often leads to the constipation returning.
Yes. Overflow constipation occurs when liquid stool leaks around a blockage in the colon and passes as what looks like diarrhoea or soiling. If your child has unpredictable loose stools or accidents alongside constipation, or if their pattern alternates between the two, overflow is worth discussing with a specialist.
Fibre plays an important role in bowel health and is often part of managing constipation. However the type of fibre matters as much as the amount. Some types of fibre add bulk and support stool movement, while others, particularly certain fermentable fibres, can contribute to bloating, wind and stomach pain in children whose gut is already sensitive or not moving efficiently.
If your child has constipation and also has significant tummy pain or bloating, look at the types of fibre in their diet rather than simply increasing the total amount. A paediatric dietitian can help identify which fibres are likely to help and which may be making symptoms worse.
Recovery varies from child to child. I usually recommend laxative treatment for several months at minimum before attempting any reduction.
Full bowel recovery, where your child no longer needs a laxative to have regular, comfortable poos, can take longer.
It depends on how long the constipation has been going on, and whether your child has been withholding.
When stool builds up in the colon over time, the bowel stretches to accommodate it.
This means your child can retain a much larger amount before finally passing it.
Large stools are a sign that your child has been holding onto stool for longer than usual, not a sign of anything unusual about what they are eating.
About the Author
Bahee Van de Bor is a Registered Paediatric Dietitian specialising in children’s digestive health. She has over 20 years of clinical experience, including 12 years working at Great Ormond Street Hospital. Bahee works with families whose children experience constipation, diarrhoea, tummy pain and IBS-type symptoms through her clinical programme, the Happy Belly Club®.
If you are concerned about your child’s ongoing gut symptoms, you can learn more about the Happy Belly Club® or request a Discovery Call to discuss your child’s situation.
