5-year-old girl’s underpants have yellowish may be urine is not wiped clean and other physiological factors lead to, is mostly normal. However, it can also be related to vulvar infections, which are diseases that are not normal. Urine usually contains urea and other substances that can make stained underwear yellow. It is normal for the underwear to turn yellow when the child fails to wipe it clean after urinating. This is normal and will go away with proper cleaning and care. When the child’s vulva is infected, especially by bacteria, the child has symptoms such as vulvar itching and pain. The damaged mucous membrane will also secrete inflammatory substances, which will make the stained underwear yellow, this kind of belongs to the pathological phenomenon, which is not normal. The 5-year-old girl’s underwear yellow may also be related to other factors, it is recommended to actively seek medical attention to clarify the cause of the targeted treatment.