Rotavirus in Babies & Toddlers
Content reviewed against published CDC, AAP, WHO guidelines
Last reviewed:
Rotavirus is a highly contagious virus that causes severe diarrhea and vomiting in infants and young children. Before the vaccine was introduced, it was the leading cause of severe diarrhea in children under 5 worldwide. Even with vaccination, it remains a concern for unvaccinated or partially vaccinated infants. It is the most common cause of severe dehydrating gastroenteritis in young children.
Key takeaways
- Rotavirus is a highly contagious virus that causes severe diarrhea and vomiting in infants and young children.
- Duration: Vomiting typically lasts 1-3 days. Diarrhea lasts 3-8 days (sometimes up to 2 weeks). Full recovery in 5-10 days for most children.
- Go to ER if: Signs of moderate-severe dehydration — no tears, sunken eyes, sunken fontanelle, very dry mouth
- A vaccine or immunization is available
Symptoms
How It Presents by Age
0-3 months
Less common due to maternal antibodies (especially in breastfed infants). When it occurs, dehydration can develop rapidly due to small body size. May present with less vomiting but significant watery diarrhea.
Risk level: High if infected
3-12 months
Most vulnerable age group. Profuse watery diarrhea (up to 10-20 times per day), vomiting, and fever. Rapid dehydration is the primary concern.
Risk level: High
1-3 years
Classic presentation with vomiting followed by profuse watery diarrhea. Most severe illness occurs on first infection. Subsequent infections tend to be milder.
Risk level: Moderate to high
3-5 years
Usually milder than in younger children. May still cause significant diarrhea but dehydration risk is lower.
Risk level: Moderate
Treatment
Oral rehydration
Oral rehydration solution (ORS like Pedialyte) is the cornerstone of treatment. Offer small frequent sips. This replaces lost fluids and electrolytes.
Continue feeding
Continue breastfeeding or formula. Do not dilute formula. Resume regular diet as soon as tolerated. The BRAT diet is no longer specifically recommended.
Anti-vomiting medication
Ondansetron (Zofran) may be prescribed if vomiting is preventing oral rehydration.
Hospital care
IV rehydration for moderate to severe dehydration or inability to tolerate oral fluids. Nasogastric rehydration is an alternative.
Home Care
- Offer oral rehydration solution (Pedialyte) in small, frequent amounts — 1-2 teaspoons every 5 minutes
- Continue breastfeeding on demand
- For formula-fed babies, continue regular formula (do not dilute)
- Once vomiting subsides, offer regular foods (do not restrict diet)
- Avoid juice and sugary drinks (can worsen diarrhea)
- Change diapers frequently and apply barrier cream to prevent diaper rash
- Wash hands thoroughly after every diaper change
- Track wet diapers to monitor hydration
When to Worry
Go to the ER if:
- Signs of moderate-severe dehydration — no tears, sunken eyes, sunken fontanelle, very dry mouth
- No wet diaper for 6-8 hours
- Baby is limp, lethargic, or difficult to wake
- Bloody diarrhea
- Vomiting everything for 12+ hours
- Baby under 3 months with fever and diarrhea
- Severe abdominal pain or distension
Call your doctor if:
- Diarrhea lasting more than 5-7 days
- Baby under 6 months with vomiting and diarrhea
- Unable to keep any fluids down for 8 hours
- Blood or mucus in stool
- Fever lasting more than 3 days
- Signs of mild dehydration (dry mouth, fewer wet diapers)
Keep an eye on:
- Fewer than 3 wet diapers in 24 hours
- No tears when crying
- Sunken fontanelle (soft spot)
- Diarrhea lasting more than 7 days
- Blood in stool
- Increasing lethargy
Prevention
- Rotavirus vaccine (RotaTeq — 3 doses, or Rotarix — 2 doses) starting at 2 months
- Vaccine must be started before 15 weeks of age
- Strict hand hygiene — wash hands after every diaper change
- Disinfect contaminated surfaces with bleach-based cleaner
- Breastfeeding provides some protection
- Keep sick children home from daycare
- Do not share bottles, cups, or utensils
Contagion & Incubation
Incubation
1-3 days
Contagious for
From 2 days before symptoms until 10 days after symptoms resolve. The virus is shed in very large quantities in stool.
Duration
Vomiting typically lasts 1-3 days. Diarrhea lasts 3-8 days (sometimes up to 2 weeks). Full recovery in 5-10 days for most children.
Frequently asked questions
How long does rotavirus last?
How does rotavirus gastroenteritis spread?
When should I take my baby to the ER?
Can rotavirus gastroenteritis be prevented?
When can my child return to daycare?
Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
Related Illnesses
Bottom line
Rotavirus is a viral illness that typically resolves on its own. Seek emergency care if signs of moderate-severe dehydration — no tears, sunken eyes, sunken fontanelle, very dry mouth.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.