Infant colds are diseases caused by respiratory or gastrointestinal viral infections, and onset is usually sudden. The registration for a doctor's visit may vary depending on the timing. If it's during normal working hours, then a visit to the pediatric outpatient clinic is usually sufficient. However, if it's during off hours, such as at noon, evening, weekends, or public holidays, then a visit to the pediatric emergency department is generally required. Additionally, depending on the symptoms accompanying the cold, a sub-specialty within pediatrics can be chosen. For instance, if the infant cold includes significant respiratory symptoms, then a visit to the pediatric respiratory medicine outpatient clinic is appropriate. If the cold comes with gastrointestinal symptoms, then the pediatric gastroenterology outpatient clinic is suitable.