The best first steps for a constipated child are increasing fiber-rich foods, adding more water, and trying specific fruit juices that act as natural softeners. If dietary changes aren’t enough, over-the-counter options like polyethylene glycol (commonly sold as MiraLAX), milk of magnesia, or glycerin suppositories can help. The right approach depends on your child’s age.
Fruit Juices That Work as Natural Stool Softeners
Prune, pear, and apple juices contain a sugar alcohol called sorbitol that the body absorbs slowly. Much of it passes through unabsorbed, which pulls water into the intestines and softens stool. The North American Society of Pediatric Gastroenterology, Hepatology, and Nutrition specifically recommends these three juices to increase stool frequency and water content in young children.
For babies under 12 months, the American Academy of Pediatrics advises avoiding juice entirely unless a pediatrician recommends it for constipation. For toddlers and older kids, a few ounces of pear or prune juice mixed into their routine can make a noticeable difference within a day or two. This is one of the simplest interventions and a good place to start before reaching for anything in the medicine aisle.
How Much Fiber and Water Kids Actually Need
Most constipated children aren’t eating enough fiber, drinking enough water, or both. The daily fiber targets by age are:
- Ages 1 to 3: 19 grams per day
- Ages 4 to 8: 25 grams per day
- Ages 9 to 13: 26 grams for girls, 31 grams for boys
- Ages 14 to 19: 26 grams for girls, 38 grams for boys
To put that in perspective, a medium apple has about 4 grams of fiber, a cup of cooked broccoli has about 5, and a half-cup of black beans has around 8. Getting to 19 or 25 grams takes deliberate effort. High-fiber cereals, oatmeal, berries, whole wheat bread, and peas are all practical ways to close the gap. Increase fiber gradually over a week or two, since adding too much at once can cause gas and bloating.
Water matters just as much as fiber. Fiber absorbs water to bulk up stool, and without enough fluid, extra fiber can actually make constipation worse. A child who weighs about 35 pounds needs roughly 7 cups of fluid a day, while a 60-pound child needs about 9 cups. If your child is constipated, adding 1 to 2 extra cups of water per day on top of their usual intake is a reasonable starting point. Milk and sugary drinks don’t substitute well here. Plain water is ideal.
Over-the-Counter Laxatives by Age
When diet changes alone aren’t resolving things, a few OTC options are widely used for kids. The most common is polyethylene glycol powder (MiraLAX), an osmotic laxative that draws water into the colon to soften stool. It’s tasteless and dissolves in any drink, which makes it easy to give to reluctant kids. Many pediatricians recommend it as a first-line option because it’s gentle, non-habit-forming, and effective for ongoing use if needed.
Milk of magnesia is another osmotic laxative that works similarly. Chewable tablets are available for children, with typical doses of 1 to 3 tablets for kids ages 2 to 5 and 3 to 6 tablets for ages 6 to 11. Children under 2 should not take it without a doctor’s guidance. Each dose should be taken with a full 8-ounce glass of liquid.
Stimulant laxatives like senna (sold as Ex-Lax or Senokot) work by triggering the intestinal muscles to contract. The liquid form is approved for children 2 and older, while chewable tablets are for ages 6 and up. Kids ages 6 to 11 typically take one tablet once or twice daily. Stimulant laxatives work faster than osmotic ones but are better suited for short-term use rather than daily management.
Glycerin Suppositories for Quick Relief
If your child is visibly uncomfortable, straining hard, or hasn’t had a bowel movement in several days, a glycerin suppository can provide faster relief than anything taken by mouth. These typically produce a bowel movement within 15 minutes to one hour. For children ages 2 to 5, the standard dose is one pediatric suppository (1.2 grams) once daily. Infant-sized suppositories are available for younger babies, but check with your pediatrician before using them on children under 2.
Suppositories work locally in the rectum, so they don’t carry the systemic effects of oral laxatives. They’re useful as a rescue option when a child is clearly backed up, but they’re not meant for daily long-term use.
Toilet Habits That Prevent Backup
Many kids hold their stool because they’re busy playing, uncomfortable on the toilet, or anxious about having a bowel movement. Building a consistent sitting routine helps retrain their body’s signals. The best times to have your child sit on the toilet are within two hours of waking up and about 30 minutes after a large meal or snack. After eating, the body triggers a natural wave of intestinal movement called the gastrocolic reflex, and timing toilet sits to match this reflex gives kids the best chance of success.
Keep sits short and pressure-free. For younger toddlers still learning, one minute at a time is enough. For school-age kids, 3 to 5 minutes works well. A small stool under their feet so their knees are higher than their hips mimics a squatting position and makes it easier to pass stool. Rewards like stickers can help younger children cooperate with the routine. The goal is to make sitting on the toilet feel normal and low-stakes, not like a punishment for being constipated.
Why Probiotics Aren’t the Answer
Many parents reach for probiotic supplements hoping they’ll get things moving. The evidence doesn’t support this. A systematic review and network meta-analysis comparing probiotics to standard treatments found that probiotics did not significantly increase the number of bowel movements per week in children with functional constipation. There is currently no evidence that probiotics work as a standalone treatment for this problem. They’re not harmful, but spending money on probiotic supplements for constipation specifically is unlikely to help.
Signs That Need Medical Attention
Ordinary constipation in children is common and usually manageable at home. But certain red flags point to an underlying condition that needs evaluation. Watch for blood in the stool accompanied by fever, chronic failure to gain weight or grow, or any neurological symptoms like leg weakness or changes in sensation. In newborns, not passing the first stool (meconium) within 48 hours of birth can signal Hirschsprung disease, a condition where nerves in part of the colon are missing. A sacral dimple or tuft of hair at the base of the spine is another sign worth mentioning to your pediatrician, as it can indicate a spinal issue affecting bowel function.
If your child has been constipated for more than two weeks despite dietary changes and OTC laxatives, or if they’re regularly soiling their underwear (which can paradoxically happen when liquid stool leaks around a large blockage), it’s time for a pediatric evaluation.