Oral thrush is a disease caused by Candida infections of the oral mucosa. If you go for pediatric treatment, in a division with detailed specialties, newborns can visit the newborn outpatient clinic; infants or older children usually visit the pediatric outpatient clinic during normal working hours. During non-working hours, such as noon, evening, weekends, and holidays, it's appropriate to visit the pediatric emergency department. If visiting a specialized children's hospital or a dental hospital, the pediatric oral medicine outpatient clinic is also a good option. Of course, if a child with oral thrush also has some underlying diseases, it might be advisable to visit the outpatient clinic for the primary underlying disease.