Roseola in infants is a common febrile rash disease in toddlers, generally caused by a viral infection. The primary clinical manifestations of roseola include high fever lasting 3-5 days. Typically, rash develops as the fever subsides or after the fever has resolved. Some children may also experience other symptoms, such as coughing, nasal congestion, runny nose, and sometimes vomiting or diarrhea. Roseola is generally a self-limiting disease; the rash and other symptoms usually disappear gradually after the fever resolves. However, if roseola is accompanied by other viral or bacterial infections, the duration of the illness or symptoms may be prolonged. Since each child is different, the duration of symptoms like vomiting in roseola varies from one child to another, and there is no specific timeframe.