Natural alternatives (and additions) to MiraLAX for kids
If your child has been on MiraLAX for a while, you have probably wondered: is this the only option? And the answer is no — but it is complicated.
MiraLAX (polyethylene glycol 3350) is the most commonly recommended laxative in pediatrics, and it works. It is tasteless, well-studied, and it works. But it is technically only FDA-approved for adults (for 7 days) and many parents want to reduce their child long-term reliance on it. For some kids, the underlying reasons for constipation are not being addressed at all.
So whether you are looking for a natural swap, a gentler complement, or just want to understand what your other options are — this post breaks it all down. As a pediatric dietitian who specializes in constipation and gut health, I want to give you the real picture: what the evidence actually says, what is appropriate for kids, and what I would actually recommend to families I work with.
First: why is your child constipated?
Before jumping to solutions, this matters more than most people realize. Constipation in kids is rarely just a fiber problem. It is often a combination of:
• Low fluid intake
• Low dietary fiber (especially in picky eaters)
• Stool withholding — a behavioral pattern that often starts after one painful poop
• Gut motility issues driven by an imbalanced microbiome
• Sensory sensitivities that make toileting uncomfortable
• Underlying food sensitivities or GI conditions
MiraLAX addresses the symptom — hard, painful stool — but it does not address the why. The natural options below work best when you match them to the root cause. That is the core of how I work with families in The Nourished Pathway.
Natural osmotic alternatives: the closest thing to MiraLAX
MiraLAX works by drawing water into the colon to soften stool — this is called an osmotic mechanism. Several natural options work the same way.
Prunes and prune juice
This is the most evidence-backed food option for childhood constipation. Prunes contain sorbitol, a naturally occurring sugar alcohol that draws water into the colon — identical mechanism to MiraLAX. They also contain a compound called dihydroxyphenyl isatin that has a mild stimulant effect on the gut. There are actual randomized controlled trials supporting prune use in children, which puts them in a different league than most natural remedies.
Practical note: Start with 2 to 4 oz of prune juice per day for toddlers, or 2 to 3 prunes for older kids. Some children tolerate the juice better than whole prunes initially.
Pear, apple, and cherry juice
These juices are also high in sorbitol. Pear juice has the most pediatric research behind it and is particularly well-studied in infants. Apple juice is more commonly on hand, and cherry juice also has a meaningful sorbitol content.
Practical note: These work best as a short-term tool or a complement to other interventions, not as a standalone solution.
Magnesium
Magnesium is one of the most underused tools in pediatric constipation. It works osmotically — the same basic mechanism as MiraLAX — and it has been well-studied in children, particularly in Japanese research. Some families find it a more comfortable alternative because it is a mineral the body already uses, it supports muscle function (including the intestinal muscles), and there is no long-term concern about PEG 3350 exposure.
Practical note: Magnesium glycinate or citrate are generally better tolerated than oxide. Dosing matters — too much causes loose stools, too little does nothing. Always check with your child provider, especially for children under 2 or with kidney concerns.
Fiber-based options: adding bulk to stool
Fiber works differently from osmotic agents. Instead of pulling water into the colon, it absorbs water and adds bulk — which helps move stool along more efficiently. But there is fiber, and then there is fiber. Not all types work equally well, and for picky eaters especially, the form matters.
PHGG (partially hydrolyzed guar gum)
This is my personal go-to fiber recommendation for picky-eating families. PHGG dissolves completely in liquid, has zero taste, zero texture change, and has been specifically studied in children with functional constipation and GI disorders. You can add it to water, milk, smoothies, or any liquid without your child noticing.
Ground flaxseed
Ground flaxseed provides both soluble and insoluble fiber, plus omega-3 fatty acids. It has randomized controlled trial evidence in children specifically. The key word is ground — whole flaxseeds pass through undigested. Add to oatmeal, yogurt, pancake batter, or smoothies.
Kiwifruit
Kiwi has a growing evidence base for constipation that most people do not know about. It works through a combination of fiber and a unique enzyme called actinidin that helps move things through the digestive tract. Pediatric studies are still emerging but promising — and it is a food, which means it comes with nutrients, not just a laxative effect.
MCT oil: a lesser-known option worth knowing about
MCT oil (medium-chain triglycerides) has come up more and more in conversations with families — especially those already using it for another reason — so it is worth addressing directly.
Unlike regular dietary fats, MCTs are rapidly absorbed in the small intestine and can speed up gut transit time. At higher doses, the portion that reaches the colon has a mild osmotic and lubricant effect — similar in principle to mineral oil, but without the aspiration risk that makes mineral oil a no-go in young children.
The honest evidence picture: most of the constipation-related research on MCT oil is in adults and in tube-fed patients, not in otherwise healthy kids. The loose stools documented as a side effect in ketogenic diet research tell us the mechanism is real — but dedicated pediatric constipation trials do not exist yet.
Where it fits: MCT oil is most interesting for kids already using it for another reason (ketogenic diet, fat malabsorption) who also happen to be constipated. As a standalone constipation tool, the evidence is too thin to make it a first-line recommendation. If you do try it, start with a very small amount — too much too fast causes cramping, nausea, and exactly the kind of GI distress that makes picky eaters more anxious around food.
Probiotics: supporting the gut behind the scenes
Constipation and gut motility are closely tied to the gut microbiome — the community of bacteria living in your child intestines. When that community is imbalanced, it can affect how well the gut moves. Certain probiotic strains have been studied specifically for pediatric constipation, and this is an area where strain specificity really matters.
Lactobacillus reuteri DSM 17938
This is the most evidence-backed probiotic strain for childhood constipation. It is the strain in BioGaia drops and tablets, and it has multiple pediatric studies supporting its use for improving stool frequency and consistency. When recommending probiotics for constipation, this is the strain I reach for first — not just any probiotic.
Bifidobacterium strains
Several Bifidobacterium strains also have pediatric constipation research behind them, though the evidence is less consistent than L. reuteri. They are worth considering as part of a broader gut health strategy, especially for children with dysbiosis or a history of antibiotic use.
What about senna?
Senna is worth a separate mention because it is often marketed as a herbal or natural option — but it is the same compound as pharmaceutical Senokot. The active chemicals in senna leaf (sennosides) directly stimulate intestinal muscle contractions. It works, it has been studied in children, and it is appropriate for short-term use. Just know that herbal does not mean gentler in this case.
The foundational stuff that often gets skipped
Before adding any supplement or intervention, these basics genuinely move the needle — and they are often where I start with families:
• Fluid intake: most kids with constipation are not drinking enough water. This is especially true for picky eaters who prefer milk, juice, or no drinks at all. Water is the single most underrated tool in pediatric constipation.
• Movement: physical activity directly stimulates gut motility. More movement generally means more regular bowel movements.
• Toilet routine: a consistent bathroom time after meals (especially breakfast, when the gastrocolic reflex is strongest) can make a significant difference for kids who withhold.
• Reducing cow's milk if excessive: large amounts of dairy can contribute to constipation in some children.
When MiraLAX is still the right call
Natural options are worth exploring, but they are not always the answer — and I want to be honest about that. MiraLAX is still the appropriate first-line tool in several situations:
• Active fecal impaction — natural options are too slow when a child has not had a full bowel movement in several days
• Severe constipation where stool withholding has become a behavioral cycle
• When a child is in pain and comfort needs to come first
• When previous natural interventions have not worked and you are waiting to dig deeper into root causes
The goal is not to avoid MiraLAX at all costs. It is to understand why your child is constipated so you can address it at the root — and ideally, get to a place where they do not need a laxative at all.
Ready to get to the root?
If your child has been on MiraLAX for months and you are not sure what is actually driving it — or you have tried adding fiber and juice and nothing has really changed — that is exactly the kind of situation I work through in The Nourished Pathway.
It is a 3-month program where we dig into the full picture: eating patterns, gut health, nutrient status, and the behavioral and sensory factors that often keep kids stuck. Constipation is one of the most common things I see alongside picky eating — and they are often connected in ways that generic advice does not reach.
If you are ready to stop managing symptoms and start understanding what is actually going on, apply for The Nourished Pathway here!
This post is for educational purposes only and is not a substitute for individualized medical or nutrition advice. Always consult with your child healthcare provider before starting any new supplement or making significant dietary changes.
