How to Treat Vomiting and Diarrhea in Kids.

Vomiting and diarrhea in kids can feel overwhelming for parents. One minute, your child seems completely fine, and the next, you are dealing with repeated vomiting, constant diaper changes, or a child who refuses to drink anything.

Vomiting and diarrhea in children are two of the most common reasons parents call health lines or head to a clinic. The good news? Most cases of viral gastroenteritis (the stomach bug) are self-limiting and can be safely managed at home with the right approach.

As a pharmacist and a mom, I want to walk you through what is actually happening in your child’s body, how to care for them at home, and the specific signs that mean it is time to call a doctor.

What Causes Vomiting and Diarrhea in Kids?

The most common cause of vomiting and diarrhea in kids is viral gastroenteritis, also known as the stomach flu. Despite the name, it is not related to influenza. Common viruses include norovirus, rotavirus, and adenovirus.

Other possible causes include:

• Bacterial infections
• Food poisoning
• Food allergies or intolerances
• Motion sickness
• Medication side effects
• Anxiety or stress in older children
• Less commonly, an underlying digestive condition

When bacteria are involved, symptoms may be more severe and can include:

• Bloody stools
• High fever
• Severe abdominal pain

Most stomach bugs in otherwise healthy children are viral, improve on their own within a few days, and do not require antibiotics.

How Long Does a Stomach Bug Last in Kids?

Although many viral gut infections cause no symptoms at all, most children experience at least one episode of gastroenteritis during early childhood.

A typical stomach bug in kids may include:

• Vomiting
• Diarrhea
• Fever
• Stomach pain or cramping
• Reduced appetite
• Fatigue

Viral gastroenteritis usually follows a predictable course:

• Vomiting: typically lasts 1–2 days
• Diarrhea: usually lasts 5–7 days

Stools are often loose or watery and may vary in color or odor during illness. Symptoms lasting longer than expected should be discussed with your healthcare provider.

The Biggest Concern: Dehydration

When a child is vomiting and has diarrhea at the same time, fluid loss can happen quickly. This is why dehydration is the main complication parents need to watch for, especially in babies and toddlers.

Young children are more vulnerable to dehydration because:

• They have a higher percentage of body water
• They have smaller fluid reserves
• They lose fluids more quickly
• They may not communicate thirst well

For a full guide, read my post on Dehydration in Kids: What You Need to Know and how to manage.

Signs of Dehydration to Watch For

In Babies and Toddlers

• Unusual sleepiness or difficulty waking
• No wet diaper for more than 4–6 hours
• Dry or sticky mouth
• No tears when crying
• Sunken soft spot (fontanelle)

In Older Children

• No urination for 8–12 hours
• Very dry mouth
• Dizziness or weakness
• Sunken-looking eyes
• Fatigue or confusion

If you notice signs of moderate or severe dehydration, contact your healthcare provider or seek urgent care.

Clinical Mama Tip: If your child vomits immediately after drinking, wait about 10 minutes before trying again. Restart with tiny sips every few minutes instead of large amounts at once.

Home Management: What to Do

1. Focus on Fluids First

The goal during the first several hours is not necessarily to stop the vomiting or diarrhea immediately. The priority is replacing lost fluids and electrolytes. For most children, an oral rehydration solution (ORS) such as Pedialyte is the best option because it contains the correct balance of water, sugar, and salts to support absorption.

Avoid:

• Juice
• Sports drinks
• Soda or pop
• Plain water as the only fluid for infants and young children

Broth alone is also not ideal because it lacks sufficient sugar to support proper electrolyte absorption.

Give Small Amounts Frequently

Even if your child refuses to drink from a cup or bottle, ORS can be offered using a spoon, syringe, or medicine dropper.

• Offer 5–15 mL (1–3 teaspoons) every 5–15 minutes
• Slowly increase the amount as tolerated
• If vomiting happens again, return to smaller amounts

Persistent vomiting lasting more than 4–6 hours in a young child should be medically assessed.

ORS Volume Guide for Mild Dehydration (First 4 Hours)

2. Continue Breastfeeding

If your baby is breastfeeding, continue feeding on demand. Breast milk provides hydration, nutrition, comfort, and immune support during illness.

3. Reintroduce Food Gradually

Once vomiting begins improving, children should slowly return to eating.

For formula-fed babies:

• Continue their usual formula in small, frequent amounts

Some children may temporarily tolerate lactose-free formula better during recovery. Speak with your healthcare provider or pharmacist before changing formulas.

For older children:

• Offer small portions of familiar foods
• Resume a normal diet gradually over 24–48 hours

There is no need to follow a strict BRAT diet. Balanced nutrition supports healing and recovery.

What NOT to Do During a Stomach Bug

Avoid:

• Forcing large amounts of fluids at once
• Giving sugary drinks like juice or soda
• Using anti-diarrheal medications without medical advice
• Stopping breastfeeding
• Sending children back to daycare or school too early

What About Anti-Nausea or Anti-Diarrhea Medications?

Anti-diarrheal medications such as loperamide are generally not recommended for children, especially young children.

These medications may:

• Cause unwanted side effects
• Slow the body’s ability to clear infection
• Increase risks in dehydrated or medically unwell children

Anti-nausea medications may sometimes be prescribed by a physician in specific situations, but should not be used without medical guidance. If you are unsure whether a medication is appropriate for your child, your pharmacist is a great first resource. For more medication safety tips, read: How to Read a Prescription Label (Like a Pharmacist).

Fever With Vomiting and Diarrhea

A low-grade fever is common with viral gastroenteritis and does not always require treatment on its own. If your child is uncomfortable and old enough to safely receive medication, acetaminophen or ibuprofen may help.

For more guidance, read:

• Fever in Kids: When to Worry, Treat, or Safely Wait
• Acetaminophen vs Ibuprofen for Kids: Which One Should You Choose?

Clinical Mama Tip: Keep in mind that suppositories may be helpful if your child cannot keep oral medications down. Your pharmacist can help you choose the right option.

When to Call Your Healthcare Provider / Emergency Room

Contact your healthcare provider if your child:

• Has diarrhea lasting longer than 7 days
• Has persistent vomiting
• Cannot keep fluids down after 4–6 hours
• Shows signs of dehydration
• Has worsening abdominal pain
• Has a fever that concerns you
• Appears increasingly unwell

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Seek urgent medical care if your child:

• Is under 6 months old
• Has green or yellow vomit (bile)
• Has blood in the stool or vomit
• Has black or tarry stools
• Is very difficult to wake
• Appears confused or severely lethargic
• Has severe dehydration
• Has a known medical condition that may complicate illness

Trust your instincts. If something feels seriously wrong, seek medical care.

How to Prevent the Spread

Stomach bugs spread very easily, especially within households.

To reduce spread:

• Wash hands thoroughly with soap and water
• Clean frequently touched surfaces regularly
• Avoid sharing utensils or cups
• Wash soiled clothing and linens promptly
• Keep children home until symptom-free for at least 48 hours

Clinical Mama Tip: Alcohol-based hand sanitizers are less effective against norovirus. Soap and water work best.

Clinical Mama Takeaway

Vomiting and diarrhea in kids can feel scary and exhausting, but most cases improve safely at home with early hydration, careful monitoring, and supportive care. The top priority is preventing dehydration, providing fluids correctly, and recognizing which symptoms require medical attention.

Parenting through illness can feel overwhelming, but you do not have to navigate it alone. Clinical Mama is here to help you make informed, confident health decisions for your family with trusted pharmacist-backed education you can actually use in real life. For more on keeping your child well during illness, join the Clinical Mama community for early access to new blog posts, wellness resources, and family health tools.

❓Frequently Asked Questions

📚References

1. World Health Organization. The treatment of diarrhoea: A manual for physicians and other senior health workers. https://iris.who.int/server/api/core/bitstreams/df59ceab-2498-4a64-bd93-ad7566addb4e/content
2. Vogel, L. (2011). Hand sanitizers may increase norovirus risk.https://www.cmaj.ca/content/183/12/E799.short
3. Dehydration and diarrhea in children: Prevention and treatment. Available at: https://caringforkids.cps.ca/handouts/health-conditions-and-treatments/dehydration_and_diarrhea
4. HealthLink BC. Vomiting, Age 11 and Younger. Available at: https://www.healthlinkbc.ca/healthwise/vomiting-age-11-and-younger
5. Diarrhea (CPS): Diarrhea Antonietta Forrester https://cps2.pharmacists.ca/document/minorailments/diarrhea_minor
6. Diarrhea (CPS): Diarrhea Dina Kao https://cps2.pharmacists.ca/document/therapeuticchoices/diarrhea
7. Acute viral gastroenteritis in children in resource-abundant countries: Uptodate Clinical features and diagnosis. O’Ryan Miguel G, Youngster Ilan https://www.uptodate.com/contents/acute-viral-gastroenteritis-in-children-in-resource-abundant-countries-clinical-features-and-diagnosissearch=acute%20gastroenteritis%20in%20children&source=search_result&selectedTitle=1~150&usage_type=default&display_rank=1&searchCorrelationId=8d915fa7-3aa0-4f18-9cab-aaea5fc2e7a6&searchCorrelationTerm=acute%20gastroenteritis%20in%20children