Dew is the daily discharge from the vagina after the end of childbirth. The presence of vaginal dew after childbirth is a normal physiological phenomenon. However, if it lasts for a long time, it should be taken seriously. At the end of labor, the necrotic membranes, blood and other tissue fluids from the uterine cavity are expelled from the body through the vagina, resulting in the formation of malodor. This is a self-purification function of the body after childbirth. Normally, the postpartum dew lasts for 4 to 6 weeks. During this six-week period, the uterus and other organs of the body have completed the repair process and returned to their pre-pregnancy state. If the postpartum dew lasts longer than six weeks, it may indicate incomplete repair of the uterus, infection of the uterine cavity, or residual placenta and fetal membranes, among other diseases. Postpartum dew as a clinical symptom can indicate the onset of disease. Therefore, it is necessary to observe the duration of postpartum dew and pay attention to the nature of postpartum dew to avoid delaying the disease. Therefore, in general, the postpartum dew can be drained in six weeks. If the postpartum dew is not drained for a long time, it is necessary to consult a hospital promptly to exclude the occurrence of postpartum complications.