Most children get constipated at some point, and the fix usually comes down to a combination of the right foods, enough fluids, good toilet habits, and sometimes a gentle over-the-counter laxative. A child is considered constipated if they’re having two or fewer bowel movements per week, passing hard or painful stools, or actively holding it in. Here’s what actually works to get things moving.
Use the Gastrocolic Reflex to Your Advantage
Your child’s body has a built-in trigger for pooping: the gastrocolic reflex. When food hits the stomach, stretch receptors send a signal through the nervous system that ramps up movement in the colon, essentially telling the body to make room for what’s coming in. This reflex is strongest in the morning and right after meals.
The simplest habit you can build is having your child sit on the toilet for five to ten minutes after breakfast every day. Don’t force anything or make it stressful. Just make it part of the routine, like brushing teeth. Over time, the body learns to respond on cue. This single habit resolves constipation for many kids without any other changes.
Foods That Work as Natural Laxatives
Prunes are the gold standard for a reason. They contain about 14.7 grams of sorbitol per 100 grams, a sugar alcohol that draws water into the intestines and softens stool. They also pack 6.1 grams of fiber per 100 grams. Pears, grapes, and apples with the peel on are also good choices. If your child won’t eat whole fruit, prune, pear, or apple juice can help, though juice has less fiber and sorbitol than the whole fruit.
Fiber does two different jobs depending on the type. Insoluble fiber, found in whole grains, vegetable skins, and wheat bran, adds bulk to stool and speeds up how fast it moves through the intestines. Soluble fiber, found in oats, beans, and many fruits, gets broken down by gut bacteria and produces compounds that help the colon function well. You want both types, and the easiest way to get them is through a variety of whole foods rather than supplements.
How Much Fiber Kids Actually Need
Most children fall short on fiber, and the targets are higher than many parents expect:
- Ages 1 to 3: 19 grams per day
- Ages 4 to 8: 25 grams per day
- Boys 9 to 13: 31 grams per day
- Girls 9 to 13: 26 grams per day
- Teen boys 14 to 19: 38 grams per day
- Teen girls 14 to 19: 26 grams per day
For reference, a slice of whole wheat bread has about 2 grams. A medium pear has about 5.5 grams. Getting to 25 grams takes deliberate effort. Increase fiber gradually over a week or two, because adding too much too fast can cause bloating and gas, which won’t help your cause with a reluctant child.
Make Sure They’re Drinking Enough
Fiber without enough fluid can actually make constipation worse, because dry fiber just sits in the colon. Water is the best option. A rough guideline for daily fluid needs based on weight: about 100 ml (3.4 ounces) per kilogram for the first 10 kg of body weight, then 50 ml per kilogram for the next 10 kg, and 20 ml per kilogram for every kilogram after that. For a 20 kg (44 pound) child, that works out to about 1,500 ml, or roughly 50 ounces, per day from all sources including food.
You don’t need to measure precisely. Just make water available throughout the day and offer it at every meal and snack. If your child’s urine is pale yellow, they’re likely getting enough.
Fix Their Toilet Posture
The position your child sits in on the toilet matters more than most people realize. When sitting upright on a standard toilet, the muscle that wraps around the rectum (the puborectalis) creates a kink at about 80 to 90 degrees, which actually makes it harder to push stool out. In a squatting position, that angle opens up to 100 to 110 degrees, straightening the path and requiring less straining.
Kids can’t squat on a regular toilet, but a small footstool placed in front of the toilet gets their knees above their hips, which mimics the squatting position. One study found that using a footstool cut the average time to have a bowel movement roughly in half, from about 113 seconds down to 56 seconds. Have your child lean slightly forward with their feet flat on the stool. This alone can make a noticeable difference for a child who struggles with straining.
When to Try an Over-the-Counter Laxative
If diet, fluids, and routine aren’t enough after a week or two, an osmotic laxative containing polyethylene glycol 3350 (sold as MiraLAX and store-brand equivalents) is the first-line treatment recommended by the North American Society for Pediatric Gastroenterology, Hepatology, and Nutrition. It works by pulling water into the colon to soften stool. It’s tasteless, dissolves in any liquid, and isn’t absorbed into the body.
The typical maintenance dose ranges from 0.2 to 0.8 grams per kilogram of body weight per day, with research showing that 0.5 grams per kilogram per day successfully treated constipation in 90% of children in one study. For a 20 kg child, that’s about 10 grams, or roughly one-quarter of the standard adult capful. Your pediatrician can help you find the right dose, since the goal is soft, formed stools, not diarrhea. Some children need it daily for weeks or even months, and that’s considered safe for long-term use.
Probiotics May Add a Small Boost
A specific probiotic strain called Lactobacillus reuteri DSM 17938 has some evidence behind it. A meta-analysis of randomized trials found that children taking this strain had about one additional bowel movement per week compared to those on placebo. That’s a modest benefit, and it improved frequency but not stool consistency. Probiotics work best as an add-on to the basics (fiber, fluids, routine), not a replacement. Look for products that specifically list this strain, since different probiotic strains do different things.
The Holding Cycle and How to Break It
Many kids become constipated not because of diet but because of a painful bowel movement that makes them afraid to go again. They start holding it in, which allows the colon to absorb more water from the stool, making the next one even harder and more painful. This cycle can escalate to the point where a child has accidents (soiling their underwear), which happens when liquid stool leaks around a large, hard mass stuck in the rectum. This is not a behavioral problem. The child often can’t feel it happening.
Breaking this cycle requires making stools soft enough that pooping doesn’t hurt for a sustained period, usually several weeks to months. That’s where the osmotic laxative is most valuable. Once your child has enough consecutive pain-free experiences on the toilet, the fear fades and normal habits can take over. Punishing a child for accidents or forcing them to sit on the toilet when they’re upset will make the holding behavior worse, not better.
Signs That Need Medical Attention
Occasional constipation is common and manageable at home. But certain patterns point to something beyond a simple dietary fix. If your infant didn’t pass their first stool (meconium) within the first 48 hours of life, that’s relevant history to share with your pediatrician. In older children, watch for constipation that starts in the first month of life, a persistently bloated or tight abdomen, vomiting along with constipation, poor weight gain, or weakness in the legs. These can signal structural or neurological conditions that require evaluation beyond diet changes and laxatives.
For the vast majority of kids, constipation is functional, meaning there’s no underlying disease. It responds well to the combination of regular toilet time after meals, more fiber and water, a footstool, and an osmotic laxative when needed. The key is consistency. Most children improve within two to four weeks of sticking with these changes daily.