A constipated 5-month-old typically needs a combination of gentle physical techniques and small dietary adjustments to get things moving. Before you intervene, though, it helps to confirm that your baby is actually constipated, because normal infant straining can look a lot like a problem when it isn’t one.
Make Sure It’s Actually Constipation
Babies have weak abdominal muscles, so they often strain, cry, and turn red in the face during a bowel movement. This looks alarming, but if the stool comes out soft, there’s likely no issue. Constipation is about stool consistency, not how hard your baby works to push it out.
After the first month of life, many babies go days or even a full week between bowel movements. This is especially common in breastfed infants. A gap of several days is not constipation as long as your baby seems comfortable between attempts and the stool is still soft when it arrives. What you’re looking for instead are specific changes: hard, dry, pellet-like stools; visible pain or distress during a bowel movement; a firm, bloated belly; unusual fussiness paired with increased spit-up; or blood on the surface of the stool. If you’re seeing those signs, your baby is genuinely constipated and the strategies below can help.
Try Physical Techniques First
Two simple movements can stimulate your baby’s digestive tract without any dietary changes at all. You can do both several times a day, ideally when your baby is calm and relaxed.
Bicycle legs: Lay your baby on their back and gently move their legs in a pedaling motion, as if riding a bicycle. This compresses the abdomen rhythmically and helps move gas and stool through the intestines. A related technique is the knee-tummy press: place your hands on your baby’s calves (including the knees), gently push both legs together toward the belly, hold for three to five seconds, then release. Repeat three to five times.
Belly massage: The “I Love You” massage follows the path of the large intestine. With your baby on their back, use gentle pressure to trace a straight line down the left side of the belly (that’s the “I”). Then trace an upside-down “L” going from your left to your right across the upper belly and down (the “Love”). Finally, trace an upside-down “U” shape from the lower right of the belly, up, across, and down the left side (the “You”). Say the words as you go. This pattern pushes contents along the natural route stool travels through the colon.
A warm bath can also relax the muscles around the abdomen and sometimes prompts a bowel movement on its own.
Add a Small Amount of Fruit Juice
For babies over 1 month old who are still exclusively on breast milk or formula, a small amount of fruit juice can act as a natural stool softener. The sugars in certain juices draw water into the intestines, making stool easier to pass.
Pear and apple juice work well. After 3 months of age, prune juice is also an option and tends to be the most effective. The general guideline is 1 ounce per month of age per day, which means a 5-month-old can have up to 4 ounces daily (the maximum for any infant). Start with a smaller amount, around 1 to 2 ounces mixed with an equal part of water, and see how your baby responds before increasing. You’re not trying to make juice a regular part of the diet. Use it as a short-term tool until bowel movements normalize.
If Your Baby Has Started Solids
Some families begin introducing solid foods around 4 to 5 months. If your baby recently started solids and constipation followed, the new foods are very likely the cause. Certain early foods are known to slow things down: rice cereal, bananas, and applesauce (cooked, not juice) are common culprits.
The easy fix is to lean toward the “P fruits”: pureed prunes, pears, peaches, and plums. These have a mild laxative effect and are well tolerated at this age. Pureed peas can also help. If you’ve been offering rice cereal, try switching to oat cereal instead. There are no formal fiber guidelines for babies under 1, so you don’t need to count grams. Just shift the balance of what you’re offering toward softer, high-moisture fruits and away from starchy, binding foods.
What About Extra Water?
For babies under 6 months, breast milk or formula should provide all the hydration they need. Supplemental water is generally not recommended at this age because it can interfere with nutrient intake and, in rare cases, disrupt electrolyte balance. If your baby is formula-fed, double-check that you’re mixing the formula correctly. Adding too little water to the powder is a surprisingly common cause of hard stools. The fruit juice approach described above is a safer way to increase fluid in the intestines without giving plain water.
Glycerin Suppositories as a Last Resort
If dietary changes and physical techniques haven’t worked after a day or two and your baby is visibly uncomfortable, a glycerin suppository can provide quick relief. These work by drawing water into the rectum and lubricating the stool. For infants, a small sliver of a pediatric glycerin suppository is inserted gently into the rectum. Most babies will have a bowel movement within 15 to 60 minutes.
Glycerin suppositories are generally considered safe for occasional use, but they should not become a regular habit. Possible side effects include rectal irritation and diarrhea. Do not use them if your baby is dehydrated or if you’ve noticed any rectal bleeding. If you find yourself reaching for a suppository more than once or twice, that’s a signal to talk to your pediatrician about what’s going on.
Signs That Need Medical Attention
Most infant constipation resolves with the approaches above, but certain symptoms point to something more serious. Contact your pediatrician promptly if your baby has stomach pain or crying that continues for more than an hour after you’ve tried the comfort measures above, vomits two or more times with a belly that looks more swollen than usual, develops a weak suck or noticeably weak muscles, or has blood in the stool that doesn’t seem to come from a small surface tear. A baby who looks or acts very sick, meaning unusually limp, unresponsive, or inconsolable, needs same-day evaluation. Persistent constipation that doesn’t respond to any home measures over several days also warrants a visit, because your pediatrician can assess whether an underlying issue like a formula intolerance or, rarely, a structural problem is involved.