The best first steps for a constipated toddler are high-fiber foods, extra water, and small amounts of fruit juice that contain natural stool-softening sugars. If dietary changes alone don’t work within a week or two, an over-the-counter osmotic laxative is the most widely recommended medical option for young children. Most toddler constipation is functional, meaning there’s no underlying disease, and it responds well to a combination of diet, fluids, and sometimes behavioral changes around toileting.
How to Tell If Your Toddler Is Actually Constipated
Constipation isn’t just about how often your toddler poops. It’s defined by a combination of frequency and stool quality. On the Bristol Stool Chart, which doctors use to classify stool consistency, types 1 (hard lumps) and 2 (lumpy and sausage-shaped) indicate constipation. Types 3 through 5 are considered normal.
Under the Rome IV criteria, which pediatric gastroenterologists use for diagnosis, a toddler is considered functionally constipated if they show two or more of these signs over one to two months: fewer than two bowel movements per week, a history of painful or hard stools, stool withholding behavior (like clenching, crossing legs, or hiding in a corner), or a large stool mass you can feel in their belly. You don’t need a formal diagnosis to start making changes at home, but recognizing the pattern helps you know when simple fixes should be working and when they’re not.
High-Fiber Foods That Help
Toddlers aged 1 to 3 need about 14 grams of fiber per day. Most don’t come close to that. Increasing fiber gradually is the single most effective dietary change you can make, and the foods that deliver it are surprisingly toddler-friendly.
The best sources include:
- Legumes: lentils, black beans, chickpeas, and kidney beans are among the highest-fiber foods you can offer. Mash them into spreads, mix into pasta sauce, or serve as soft finger foods.
- Fruits: berries, pears, apples (with skin), and oranges. Pears are especially helpful because they contain sorbitol, a natural sugar alcohol that draws water into the stool.
- Vegetables: green peas, broccoli, and carrots all contribute meaningful fiber. Steamed until soft, they’re easy for toddlers to eat.
- Whole grains: oatmeal, whole wheat bread and pasta, and bran cereals. Swapping white bread for whole wheat at meals adds fiber without changing the routine much.
Introduce these foods gradually over a few days rather than all at once, since a sudden jump in fiber can cause gas and bloating. Pair every increase in fiber with extra fluids, because fiber needs water to work. Without enough liquid, extra fiber can actually make constipation worse.
Fluids: Water and Juice
Children aged 12 to 24 months should drink roughly 8 to 32 ounces of water per day in addition to their milk. For ages 2 to 5, that range goes up to 8 to 40 ounces. Many toddlers fall on the low end, especially if they’re filling up on milk.
Speaking of milk: too much cow’s milk is one of the most common contributors to toddler constipation. The recommended amount is about 16 ounces (2 cups) per day for children under 2, and 16 to 24 ounces for ages 2 to 5. If your toddler is drinking significantly more than that, cutting back and replacing some of those ounces with water can make a noticeable difference.
Certain fruit juices act as gentle, natural laxatives because they contain sorbitol, which pulls water into the intestines and softens stool. Prune juice is the most effective, followed by pear juice, then apple juice. A small amount is typically all you need. For toddlers, 2 to 4 ounces per day is a reasonable starting point. You can dilute it with water or offer it straight. These juices aren’t a long-term hydration strategy, but they’re a safe and effective tool when your toddler is backed up.
Over-the-Counter Laxatives
When diet and fluids aren’t enough, polyethylene glycol 3350 (sold as MiraLAX and generic equivalents) is the first-line medical treatment recommended by both North American and European pediatric gastroenterology societies. It’s an osmotic laxative, meaning it works by pulling water into the colon to soften stool. It has minimal absorption into the body, which is part of why it has a strong safety profile in children.
The typical maintenance dose starts at around 0.4 grams per kilogram of your child’s body weight per day, adjusted up or down based on how they respond. For a 30-pound toddler (about 14 kg), that works out to roughly half a capful mixed into any drink. The powder is tasteless and dissolves completely, which makes it one of the easier medications to get a toddler to take.
Studies have evaluated this medication in children as young as 7 weeks, and a review published by the American Academy of Pediatrics found it safe for use in children under 18 months, with side effects limited to occasional gas and temporary loose stools that resolved with dose adjustments. If your child needs it for a blockage (fecal impaction), the short-term dose is higher, around 1 to 1.5 grams per kilogram per day for three to six days.
One important point: maintenance treatment often needs to continue for at least two months, and all constipation symptoms should be gone for a full month before you start tapering. Stopping too soon is one of the most common reasons constipation comes back. If your toddler is in the middle of potty training, experts recommend keeping the medication going until training is complete. Taper gradually rather than stopping all at once.
If polyethylene glycol isn’t available, lactulose (a sugar-based osmotic syrup) is the recommended alternative.
Behavioral Strategies During Potty Training
Constipation and potty training often collide. A toddler who has one painful bowel movement may start withholding stool to avoid the pain, which makes the next stool even harder and larger, creating a cycle that can persist for months. If your child is actively withholding, resolving the constipation with diet or medication before pushing toilet training forward is usually the better approach.
The American Academy of Pediatrics recommends a child-oriented method: begin only when your toddler shows signs of readiness, generally after 18 months. Those signs include asking to use the potty, showing interest in “big kid” underwear, or telling you when their diaper needs changing. Forcing a toddler to sit on the toilet before they’re ready tends to increase resistance and withholding.
Once they are ready, keep sessions short, relaxed, and pressure-free. Sitting on the potty for a few minutes after meals takes advantage of the body’s natural reflex to move stool after eating. Use whatever motivates your child, whether that’s stickers, a favorite song, or simple praise. Avoid punishment, shaming, or any language that frames pooping as a problem. The goal is to make the toilet feel safe and routine, not like a battleground.
Probiotics: Helpful but Limited
Probiotics get a lot of attention for digestive issues, but the evidence in pediatric constipation is modest. One strain with the most research behind it, Lactobacillus reuteri DSM 17938, showed a small but measurable increase in weekly stool frequency in a randomized trial (from about 6 to 7.5 bowel movements per week). The same study found improvements in pain during bowel movements and less stool retention behavior. However, the effect on stool consistency was not statistically significant with the probiotic alone.
Probiotics are unlikely to resolve significant constipation on their own, but they may be a useful add-on to dietary changes and medication, particularly for children with mild symptoms or as part of a longer-term gut health strategy.
Signs That Need Medical Attention
Most toddler constipation resolves with the approaches above, but certain symptoms point to something more serious. Bring your child to a doctor if constipation lasts longer than two weeks despite home treatment, or sooner if you notice fever, blood in the stool, abdominal swelling, refusal to eat, weight loss, pain during every bowel movement, or any tissue protruding from the anus (rectal prolapse). These can signal conditions that need evaluation beyond dietary changes.