The most important thing you can give a one-year-old with diarrhea is fluids, specifically an oral rehydration solution like Pedialyte. Most cases of toddler diarrhea are caused by a virus, resolve on their own within a few days, and don’t require medication. Your main job is to prevent dehydration and keep feeding your child their normal diet.
Oral Rehydration Solutions Are the First Priority
Dehydration is the real danger with diarrhea in young children, not the diarrhea itself. An oral rehydration solution (ORS) like Pedialyte replaces both the water and the salts your child loses with each loose stool. These solutions are specifically formulated for children and are available at most pharmacies and grocery stores without a prescription.
A practical rule: offer about 10 mL per kilogram of your child’s body weight (roughly half an ounce per pound) after each watery stool. For an average one-year-old weighing around 20 to 22 pounds, that works out to about 3 to 4 ounces of ORS per episode of diarrhea. If your child is vomiting too, offer smaller sips more frequently rather than a full cup at once.
Don’t try to make your own rehydration solution at home. Getting the salt and sugar ratios wrong is easy, and the consequences of too much or too little sodium can be serious for a small child. Stick with a commercial product. If your child refuses the taste of plain Pedialyte, the flavored and freezer pop versions are equally effective.
Keep Feeding Their Normal Diet
You may have heard of the BRAT diet (bananas, rice, applesauce, and toast), but the American Academy of Pediatrics no longer recommends it. It’s too restrictive and doesn’t give your child the calories and nutrients they need to recover. Multiple studies have shown that continuing a child’s regular diet actually shortens the duration of diarrhea.
As long as your child is willing to eat, offer the same foods they normally have. Breast milk or formula should continue as usual. Mild, starchy foods like rice, pasta, bread, and potatoes are often well tolerated, but there’s no need to limit the diet to only those items. If your child wants chicken, yogurt, or cooked vegetables, let them eat. The goal is calories in, and a recovering gut heals faster with proper nutrition.
The one thing to avoid is sugary drinks like juice, soda, or sports drinks. These can actually pull more water into the intestines and make diarrhea worse. Water alone isn’t ideal either, because it doesn’t replace lost electrolytes.
Probiotics May Help if Given Early
Certain probiotic strains, particularly Lactobacillus rhamnosus GG (found in products like Culturelle Kids), have evidence supporting their use for acute diarrhea in children. A European pediatric gastroenterology society recommends starting a probiotic alongside rehydration therapy early after diarrhea begins. The key word is early. In one large trial where probiotics were given more than two days after symptoms started, they showed no benefit. Starting within the first 24 hours gives the best chance of shortening the illness.
Probiotics aren’t a guaranteed fix, and they won’t stop diarrhea immediately. But they’re safe for one-year-olds and, when started promptly, may reduce how long the diarrhea lasts by roughly a day.
Zinc Supplements Can Shorten Recovery
The World Health Organization recommends 20 mg of zinc per day for 10 to 14 days for children over six months with diarrhea. Zinc helps the intestinal lining recover and can reduce both the severity and duration of the episode. Zinc supplements for children are available as dissolvable tablets or syrups. This recommendation is especially emphasized in developing countries where zinc deficiency is common, but it’s a safe and inexpensive option worth discussing with your pediatrician regardless of where you live.
Medications to Avoid
Do not give your one-year-old any over-the-counter anti-diarrheal medications. Loperamide (Imodium) is not approved for children under two, and most pediatric guidelines advise against it for young children entirely. It works by slowing gut movement, which can cause dangerous complications in small bodies, including bloating and intestinal blockage.
Bismuth subsalicylate (Pepto-Bismol, Kaopectate) is not safe for children under 12. It contains a compound related to aspirin, and children are especially sensitive to its effects, particularly when they’re already losing fluids from diarrhea or vomiting. There is also a risk of Reye’s syndrome, a rare but serious condition, if the child has a viral illness.
Signs of Dehydration to Watch For
Mild diarrhea in a one-year-old who is still drinking, eating, and playing is usually manageable at home. But dehydration can develop quickly in small children. Watch for these signs:
- Fewer wet diapers than usual (fewer than six in 24 hours, or noticeably drier diapers)
- No tears when crying
- Dry mouth, lips, or tongue
- Unusual sleepiness or fussiness
- Sunken soft spot on the top of the head
If you notice any of these, increase fluid intake with an ORS and contact your child’s doctor. Mild dehydration (around 3 to 5 percent fluid loss) can typically be corrected at home by giving about 50 mL of ORS per kilogram of body weight over 2 to 4 hours. That’s roughly 16 to 17 ounces for a 22-pound child, offered in small frequent sips. Moderate dehydration or any signs of severe dehydration (no wet diapers for several hours, very sunken eyes, limp or unresponsive behavior) need medical attention right away.
When Diarrhea Needs Medical Attention
Most toddler diarrhea from a stomach bug clears up within three to five days. But certain signs mean you should call your pediatrician rather than waiting it out:
- Diarrhea lasting more than 24 to 48 hours, especially with a fever
- Blood or black color in the stool
- Fever above 102°F (38.9°C)
- Persistent vomiting that prevents your child from keeping fluids down
- Signs of dehydration that aren’t improving with oral fluids
Bloody stools can indicate a bacterial infection that may need specific treatment. High fever alongside diarrhea sometimes points to an infection that won’t resolve on its own. And if your child simply can’t keep any fluids down for more than a few hours, they may need IV fluids in a medical setting.