Normally, there is no abdominal pain at the time of vaginal redness, and labor is expected to start in about 24-48 hours with regular contractions. Vaginal redness is a reliable sign that labor is about to start, as the fetal membranes near the cervix separate from the uterine wall there, resulting in the rupture of capillaries and the discharge of a small amount of blood through the vagina, which mixes with the mucus plug in the cervical canal. If the amount of vaginal bleeding is more than the usual amount of menstruation, it should not be considered as preterm labor, but as abnormal bleeding in late pregnancy, such as placenta praevia, cervical lesions, placental abruption and other pathological factors. Nowadays, because of the promotion of painless delivery, although the period of delivery, i.e. the second stage of labor, is slightly prolonged, the woman’s delivery experience is significantly improved and the pain of delivery is reduced to a certain extent.