Bleeding during intercourse for the first time after three months of labor may be caused by vaginal inflammation, cervical disease, vaginal dryness and other factors. 1. Vaginal inflammation: vaginal inflammation after childbirth, inflammatory stimulation will lead to vaginal wall congestion, in the coitus may cause vaginal wall damage, the symptoms of coitus bleeding. 2. Cervical disease: maternal cervical polyps and other cervical diseases, in the coitus contact with the cervical polyps, will lead to cervical polyp bleeding. 3. Vaginal dryness: breastfeeding mothers, the body of estrogen and progesterone levels are low, vaginal dryness will occur during intercourse, and at this time the excitement is not enough, coitus may cause damage to the vaginal wall, the symptoms of coitus bleeding. The woman should not have intercourse too early, and the first time to have intercourse after delivery should be made sure that the body has recovered. If bleeding occurs after intercourse, you should consult a doctor in time to find out the cause of the bleeding.