If it is bloody, it will be more obvious and will be manifested by the absence of vaginal bleeding, which indicates that it has been cleaned up. If it is plasma or white, it is difficult for the mother to distinguish, we suggest observing the following points: 1) vaginal secretion will be obviously reduced. 2) if the secretion is reduced to the extent that no sanitary napkin is needed, it basically indicates that the bad dew has been discharged. 3) judging by the time, basically, the bad dew will be completely discharged around 40 days after delivery, according to the time, and based on the clinical manifestations, we can judge whether the bad dew has been discharged. It is recommended to strengthen vulvar care and change sanitary napkins frequently when there is bad dew.