Constipation in Babies and Toddlers: Causes and Remedies

Straining and grunting during a bowel movement is one of the most alarming things a parent can witness — until you learn that it's almost always completely normal. Babies haven't yet coordinated the muscle relaxation needed to have a bowel movement comfortably, so they strain, grunt, and turn red. But actual constipation — when stool is hard, dry, and difficult or painful to pass — is a different matter. Here's how to tell the difference and what actually helps.

What Is Baby Constipation? (Hint: Frequency Alone Doesn't Count)

The most important thing to understand about infant constipation is that frequency is not the measure. Constipation is defined by:

• Stool consistency: Hard, dry, pebbled, or sausage-shaped with cracks
• Painful straining: Significant discomfort or crying during bowel movements
• Associated symptoms: Hard abdomen, reduced appetite, or refusal to feed

Breastfed babies often go 7–10 days without a bowel movement without any constipation — because breast milk is so completely absorbed that very little waste remains. If that infrequent stool is soft and painless, everything is fine. If you’re uncertain whether breastfeeding output is generally adequate, is breast milk enough covers the reassurance signs.

Source: AAP, Pediatric Nutrition Handbook; Bristol Stool Scale adapted for infants

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Common Causes of Baby Constipation

Formula Feeding

Formula-fed babies are significantly more likely to be constipated than breastfed babies. Formula proteins form firmer curds in the stomach and are harder to break down. Standard cow's milk formulas are most associated with firm stools; partially hydrolyzed (comfort) formulas can improve stool consistency for some babies.

Transition to Solid Foods

Many babies experience constipation when solid foods are introduced around 6 months. The gut is adjusting to digesting new food types, and foods low in fiber or high in binding properties (bananas, rice cereal, cooked carrots, cheese) can cause firmer stools.

Dehydration

In older babies and toddlers, not getting enough fluids is a common cause of constipation. Water is absorbed from the large intestine, so if body water is low, the colon draws more water from the stool, making it harder.

Cow's Milk Introduction

When cow's milk is introduced at 12 months, some toddlers develop constipation due to the higher protein and fat content. Iron in cow's milk is also less bioavailable and can contribute.

Infant Dyschezia: Straining That Looks Like Constipation But Isn't

Infant dyschezia is a specific condition where babies under 6 months scream and strain for 10–20 minutes before finally passing a soft, normal stool. It looks terrifying. It's actually a coordination issue — the baby hasn't yet learned to simultaneously relax the pelvic floor while increasing intra-abdominal pressure.

There is no treatment needed for infant dyschezia. It resolves on its own, typically by 3–4 months. The key distinguishing feature: the stool, when it comes, is soft. That's not constipation.

Remedies That Actually Work

For Babies Under 6 Months (Breastfed)

• First, determine if this is actually constipation (soft stool, no pain = not constipated)
• A glycerin suppository (pediatric formulation) is safe for occasional use and is the fastest-acting remedy for true constipation in young infants — produces a bowel movement within minutes
• Consult your pediatrician before trying anything else at this age; don't use mineral oil, laxatives, or adult products

For Formula-Fed Babies Under 6 Months

• Try a different formula — comfort or partially hydrolyzed formulas are worth trialing
• Ensure formula is being made with the correct water-to-powder ratio (over-concentration causes constipation)
• Ask your pediatrician about 1 oz of prune or pear juice per day

For Babies 6–12 Months (Starting Solids)

Source: AAP nutrition guidance; Cleveland Clinic pediatric gastroenterology recommendations

Additional tips for 6–12 months:

• Offer 2–4 oz of prune, pear, or apple juice daily (100% juice, no added sugar)
• Offer sips of water with meals (2–4 oz per day maximum)
• Bicycle leg exercises help stimulate bowel motility
• Warm bath followed by tummy massage (gentle clockwise circles) can help

For Toddlers 12 Months+

• Increase water — offer water freely throughout the day
• High-fiber foods daily: pears, prunes, kiwi, broccoli, beans, whole grain bread, oats
• Reduce binding foods: cow's milk over 16 oz per day is a common culprit; reduce to 16–20 oz maximum
• Prune juice: 4 oz per day is a simple, effective approach
• PEG 3350 (Miralax): Once a toddler is constipated and diet changes aren't enough, a low dose of polyethylene glycol (PEG 3350) is safe, non-habit-forming, and highly effective. Discuss dosing with your pediatrician.

When to See Your Doctor

Call your pediatrician within a day or two if:

• A newborn under 4 weeks hasn't had a bowel movement in 48 hours
• Constipation is not improving with diet changes after 1–2 weeks
• Your baby is uncomfortable, refusing feeds, or has a visibly hard and swollen abdomen
• There is any blood in the stool

Seek urgent care if:

• Green or bilious vomiting accompanies constipation (rule out obstruction)
• Your baby appears very unwell, lethargic, or in severe pain
• Constipation is associated with a distended abdomen that feels hard

Persistent infant constipation from birth — especially if accompanied by poor weight gain — should be investigated to rule out Hirschsprung’s disease, a rare condition where a segment of the bowel lacks nerve cells and cannot move stool.