Occasional light blood 45 days after delivery may be caused by ovulatory bleeding, cervical injury, poor uterine repair, intrauterine residue and other reasons. 1. Ovulation bleeding: 45 days after delivery, some women’s physical recovery is better, ovarian ovulation, ovulation, the body’s estrogen level drops, the endometrium loses hormone support briefly stripped, there may be light red blood. 2. Cervical injury: there is a cervical laceration during labor, the wound is not completely healed for 45 days after delivery, there may be a small amount of bleeding, and occasionally there will be a symptom of light blood water flowing out. 3. Poor repair of the uterus: 45 days after delivery without rest to regulate the body, in the case of poor repair of the uterus may also have light blood flow. 4. Intrauterine residue: 45 days after delivery, there is residual fetal fat or fetal membranes in the uterus are not discharged, there will also be light blood and water flow, to go to the hospital to review the ultrasound to understand the specific causes, and then targeted treatment. It is recommended that the mother should go to the hospital for review after 42 days in order to understand the recovery of the body.