Roseola in Babies & Toddlers
Content reviewed against published AAP, CDC, AAP guidelines
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Roseola is a very common viral illness caused by Human Herpesvirus 6 (HHV-6) or sometimes HHV-7. It is characterized by 3-5 days of high fever followed by a distinctive pink rash that appears as the fever breaks. Nearly all children get roseola by age 2, and most cases occur between 6 months and 2 years of age. The rash appearance is actually a sign that the illness is resolving.
Key takeaways
- Roseola is a very common viral illness caused by Human Herpesvirus 6 (HHV-6) or sometimes HHV-7.
- Duration: Fever phase: 3-5 days. Rash appears as fever breaks and lasts 1-3 days. Total illness: about 7-10 days. Child feels much better once rash appears.
- Go to ER if: Seizure — even brief ones should be evaluated for first occurrence
- No vaccine currently available
Symptoms
How It Presents by Age
0-6 months
Less common due to protection from maternal antibodies. When it occurs, may present with lower fever.
Risk level: Low
6-12 months
Most common age. High fever for 3-5 days with an otherwise well-appearing child (between fevers). Classic rash after fever resolves. Febrile seizure risk is highest in this age group.
Risk level: Low (but febrile seizure risk)
1-2 years
Second most common age group. Same classic pattern — high fever then rash. Child may be quite irritable during fever days.
Risk level: Low
2+ years
Less common. May have milder presentation or fever without rash.
Risk level: Very low
Treatment
Fever management
Acetaminophen or ibuprofen (6+ months) to keep the child comfortable. The fever can be high but is self-limiting.
Hydration
Push fluids — breast milk, formula, water, or electrolyte drinks. High fever increases fluid needs.
Rest and comfort
Let the child rest. Dress in light clothing. Keep room cool.
No specific treatment
There is no antiviral treatment needed for roseola. It resolves on its own.
Home Care
- Alternate acetaminophen and ibuprofen if fever is very high (with doctor guidance)
- Offer cool fluids frequently
- Dress baby in light, breathable clothing
- Give lukewarm (not cold) baths for comfort
- Keep room temperature comfortable — do not over-bundle
- The rash needs no treatment — it is not itchy or painful
- Expect baby to be irritable during the fever phase — extra comfort needed
- Track fever pattern — anticipate rash appearance once fever breaks
When to Worry
Go to the ER if:
- Seizure — even brief ones should be evaluated for first occurrence
- Fever over 105°F not responding to medication
- Signs of dehydration — no wet diapers, no tears, sunken fontanelle
- Child is extremely lethargic or difficult to rouse
- Purple or dark red rash that does not blanch with pressure (not roseola)
- Bulging fontanelle or stiff neck with fever
Call your doctor if:
- Fever lasting more than 4-5 days without explanation
- Baby under 6 months with high fever
- You are unsure about the diagnosis or rash appearance
- Child is refusing fluids
- Rash is lasting more than 3 days or looks unusual
- Child has a weakened immune system
Keep an eye on:
- Fever lasting more than 5 days
- Fever above 104°F not responding to medication
- Rash that is itchy, blistering, or painful (may not be roseola)
- Child seems extremely ill between fevers
- Seizure (even though febrile seizures from roseola are generally benign)
Prevention
- No specific prevention available — nearly all children get roseola
- Handwashing may reduce but cannot prevent spread
- Avoid contact with the saliva of sick children
- Since adults silently carry the virus, complete prevention is not possible
Contagion & Incubation
Incubation
5-15 days (average 9-10 days)
Contagious for
Most contagious during the fever phase before the rash appears. Once the rash appears, the child is generally no longer contagious.
Duration
Fever phase: 3-5 days. Rash appears as fever breaks and lasts 1-3 days. Total illness: about 7-10 days. Child feels much better once rash appears.
Frequently asked questions
How long does roseola last?
How does exanthem subitum (roseola infantum) spread?
When should I take my baby to the ER?
Can exanthem subitum (roseola infantum) 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
Roseola is a viral illness that typically resolves on its own. Seek emergency care if seizure — even brief ones should be evaluated for first occurrence.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.