Brown discharge on children’s underwear, for older children may be caused by menstruation or premenstrual discharge, in the ovulation period, etc. Vaginitis disease can also appear brown discharge. 1. Brown discharge before a child’s menstrual period is caused by a small amount of endometrial shedding, while brown discharge when clean may be caused by blood remaining in the reproductive tract for too long. 2. In developing children, when brown discharge appears on the underwear during ovulation, ovulation bleeding cannot be excluded. 3. Brown discharge may be vaginitis, often accompanied by odor and itching. Children’s underwear with brown discharge, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.