It takes about 4-6 weeks for the postpartum dew to clear completely. According to the color, content and time of the postpartum malodex, there are about three types of malodex: the first one is bloody malodex, which contains a lot of blood, is bright red in color and has a large amount, and lasts about 3-4 days; as time lengthens, the bleeding gradually decreases and the plasma gradually increases, gradually changing to plasma malodex. Plasma nightmare lasts about 10 days because it contains a lot of plasma, has a light red color, and gradually changes to white nightmare as time lengthens; white nightmare contains a lot of white cells, has a whiter color, and can be seen under the microscope to contain a lot of white cells; in addition, white nightmare lasts about 3 weeks to clean. Therefore, the overall duration of nightmare is about 4-6 weeks. However, if the pregnant woman’s uterus does not recover well, it is possible that the duration of nightmare will be extended accordingly.