First of all, to understand the impact of warfarin on pregnancy and childbirth: 1, warfarin can act on the fetus through the placenta, there is a certain degree of teratogenicity (about 6%, the appearance of fetal cleft lip, cleft palate, etc.), there are also studies that as long as the daily dosage of warfarin is less than 5mg, this teratogenicity is relatively small. The national warfarin dosage is also mostly below 5mg, and through modern medical genetic testing, the amount of warfarin that may need to be taken to achieve anticoagulation after valve replacement can be predicted in advance.2. Patients with warfarin anticoagulation may experience placental hemorrhage leading to miscarriage, bleeding or postpartum hemorrhage, which can endanger the life of the pregnant woman and fetus in severe cases.3. It can cause internal fetal hemorrhage. Therefore, it is best to deliver such patients by cesarean section, avoiding the extrusion process of the fetus through the birth canal and avoiding the use of forceps; anesthesia cannot be used epidural anesthesia, and it is best to use general anesthesia.