The onset of leucorrhea at the age of 10 is not usually used as a basis for calculating the time of menstruation; it only proves that a 10-year-old child has reached puberty and that the production of estrogen in the body has increased, resulting in leucorrhea in the vulva, but it does not allow the exact timing of menstruation to be calculated from the leucorrhea. Generally, menstruation may occur 3-4 years after the onset of leucorrhea, but there may be significant individual differences between children. Some children have a short interval between the onset of leucorrhea and menstruation, perhaps <2 years, while some children have a longer interval, perhaps 3-5 years, between the onset of menstruation, so the two are not necessarily related and cannot be used as a basis for calculating a child's menstrual cycle. Once your child starts to have leukorrhea, parents should pay special attention to your child's personal hygiene, and underwear must be washed and changed regularly, and should be exposed to the sun after washing. When bathing, try to rinse the vulva with running water to keep it in a dry and clean state so as not to cause local secondary bacterial infections.