The presence of a black color at the time of delivery can be triggered by vaginal bleeding as well as by pathological factors. Redness is a small amount of pale blood-colored vaginal discharge, which is a sign of premonitory labor. The color may be pink or dark brown, and there is blood in the leukorrhea. 1. Vaginal bleeding: when a small amount of brown vaginal discharge occurs a few days before the expected date of labor, it is generally considered that it may belong to a small amount of vaginal bleeding caused by the detachment of the fetal membranes, and if it accumulates in the vagina for a longer period of time, accompanied by an increase in the amount of secretion, it may cause brown blood. 3. Pathological factors: when necessary, it is necessary to receive internal examination, it is necessary to observe whether there is dilatation of the uterine orifice, it is also necessary to observe the vaginal bleeding, it is necessary to identify whether it belongs to the prenatal pathologic bleeding; if the amount of bleeding is more than or equal to the amount of menstruation, it is generally considered to be anomalous hemorrhage, such as rupture of the anterior vascular rupture or rupture of the placenta anteriorly, and so on. Pregnant women should pay attention to more rest in the late pregnancy, and should relax and avoid tension and anxiety, and should go to the hospital in time when symptoms such as vaginal bleeding and contractions occur, so that the doctor can make a clear diagnosis and cooperate with the doctor in treating the symptoms.