Diarrhea in Children: Causes, Treatment, and When to See a Doctor

Your child has a loose stomach and you're wondering whether to be concerned. Diarrhea is one of the most common complaints in children, and most cases clear up on their own within a few days. But sometimes your child needs a little extra help — and sometimes you should call the doctor.

Here is a safe guide to diarrhea in children — from causes and home treatment to signs of dehydration and when it's time to seek help.

What Counts as Diarrhea in Children?

Diarrhea is defined as three or more loose or watery stools per day. In infants it can be harder to distinguish from normal stools, since breastfed babies naturally have soft bowel movements.

Signs of diarrhea in children:

• Noticeably looser stools than usual
• More frequent toilet trips or diaper changes
• Stools may be watery, greenish, or have a different smell
• May be accompanied by abdominal pain, nausea, or vomiting

Acute vs. Persistent Diarrhea

• Acute diarrhea: Lasts under two weeks. Almost always caused by infection.
• Persistent diarrhea: Lasts over two weeks. Should always be investigated by a doctor.

Common Causes of Diarrhea in Children

Viral Infections (Most Common)

The vast majority of diarrhea in children is caused by viral infections — often called a stomach bug.

Rotavirus: Previously one of the most common causes of severe diarrhea in young children. Since the rotavirus vaccine was introduced to childhood immunization programs, the number of serious cases has dropped dramatically.

Norovirus: A highly contagious virus that causes severe vomiting and diarrhea. Often sweeps through whole families and daycare centers at once. Usually lasts two to three days.

Adenovirus and other viruses: Can cause diarrhea alongside cold-like symptoms.

Other Causes

• Bacteria — Salmonella, campylobacter, or E. coli, often from contaminated food or water
• Parasites — Less common in developed countries, but can occur after international travel
• Food allergy — Can cause diarrhea as part of an allergic reaction
• Food intolerance — For example lactose intolerance
• Antibiotics — Can disrupt gut flora and cause diarrhea as a side effect

Dehydration — What to Watch For

Dehydration (fluid loss) is the most serious complication of diarrhea in children. Young children have limited reserves, and infants are especially vulnerable.

Signs of Mild Dehydration

• Thirstier than usual
• Slightly less urine (fewer wet diapers)
• Slightly drier mouth and lips
• Restless or fussy

Signs of Severe Dehydration

How to Assess Dehydration in Babies

The number of wet diapers is the easiest way to monitor this. A baby who normally has 6–8 wet diapers a day but suddenly has only 2–3 may be heading toward dehydration.

Treatment of Diarrhea in Children

The vast majority of diarrhea in children needs only simple home treatment. The main goal is to replace lost fluid.

Fluids, Fluids, Fluids

Continue breastfeeding or give formula. Breast milk is the best thing you can give a baby with diarrhea. Do not dilute formula — give it as normal.

Give fluids the child likes. Water, thin broths, and diluted juice (maximum 1:1 ratio) can work for older children. Avoid soda, energy drinks, and undiluted juice — the high sugar content can worsen diarrhea.

Small, frequent sips. If the child is vomiting, give a teaspoon of fluid every five minutes. It's better to give a little often than a lot at once.

Oral Rehydration Solution

For more significant diarrhea, an oral rehydration solution (ORS) from the pharmacy may be needed. These powders contain the right balance of salt, sugar, and minerals to replace what the body loses.

• Available without a prescription at pharmacies
• Follow the dosage on the package
• Mix with exactly the right amount of water
• Can be given in addition to normal food and drink

Food During Diarrhea

• Give regular food when the child is hungry — don't wait
• Avoid fatty food in the first few days
• Good choices: Rice, pasta, bread, bananas, boiled chicken, potatoes
• Don't force the child to eat — let appetite return naturally
• Yogurt can help gut bacteria recover after a viral infection

What NOT to Do

• Don't give anti-diarrheal medication (loperamide/Imodium) to children — it can worsen the infection
• Don't give antibiotics without consulting a doctor — they don't work against viruses and can make diarrhea worse
• Don't stop breastfeeding — breast milk is the best thing the child can have during diarrhea
• Don't make homemade salt-water solutions — incorrect concentrations can be dangerous

When Should You See a Doctor?

Call 911 or Go to the ER If:

• The child is unresponsive or unconscious
• The child has severe abdominal pain that doesn't ease
• You see signs of severe dehydration in an infant

Preventing Diarrhea

Good Hygiene

• Wash hands with soap and water after using the toilet, changing diapers, and before preparing food
• Clean surfaces and toys regularly, especially during outbreaks at daycare
• Teach children to wash their hands properly from an early age
• Hand sanitizer is a useful addition, but does not replace handwashing

Food Safety

• Boil water if you're unsure of its quality (especially when traveling)
• Store food cold and prepare it hygienically
• Avoid raw meat and unpasteurized milk for children

Rotavirus Vaccine

The rotavirus vaccine is the most effective prevention against serious diarrhea in infants. Talk to your pediatrician about including it in your child's immunization schedule.

Diarrhea and Daycare

Many daycare centers have their own policies about when a child can return after a stomach bug.

General guidelines:

• The child should be symptom-free (no diarrhea or vomiting) for at least 48 hours before returning
• Check your daycare's specific policy — some have stricter requirements
• Notify the daycare about the stomach bug so they can take extra hygiene precautions

Frequently Asked Questions

Is diarrhea in infants dangerous?

Diarrhea in infants under 6 months should always be assessed by a doctor because small bodies lose fluid quickly. Continue breastfeeding or giving formula, and see a doctor if diarrhea persists or the child shows signs of dehydration.

Can diarrhea in children be caused by something other than infection?

Yes. Long-lasting or recurring diarrhea can be caused by food allergy, lactose intolerance, celiac disease, or other conditions. If diarrhea lasts over two weeks or comes back regularly, bring it up with the doctor.

Does probiotics help with diarrhea in children?

Some studies show that certain probiotic strains (particularly Lactobacillus) can shorten the duration of diarrhea by roughly one day. The effect is moderate. Talk to your doctor if you're considering probiotics for your child.

How long does a stomach bug last?

Most viral infections that cause diarrhea last three to seven days. Norovirus is often over within two to three days. If diarrhea continues after a week, contact your doctor.

Can the child drink milk during diarrhea?

Breast milk and formula should be continued. For older children, cow's milk in moderate amounts is usually fine. If diarrhea worsens with milk, it may be worth reducing intake temporarily and discussing it with the doctor.

Related Articles

• Fever in Children: When to Call a Doctor?
• Dehydration in Children: Signs and Treatment
• First Aid Kit Checklist

Sources

1. World Health Organization — who.int
2. American Academy of Pediatrics — aap.org
3. Centers for Disease Control and Prevention — cdc.gov