Failure of contraception during breastfeeding can take the method of IUD or oral emergency contraceptive pills, as follows: 1. IUD: put the birth control ring into the uterus, it can inhibit the fertilized egg from implanting in the uterus, and can achieve the purpose of contraception, its contraceptive efficiency is very high, the rate of pregnancy is less than 1%, and it can be placed within 120 hours after sex. Women who are breastfeeding should be especially careful with the IUD because the uterus is softer and smaller and the procedure can easily lead to the occurrence of uterine perforation. In addition, it is important to choose the right birth control ring according to the size of the uterus, otherwise it will easily lead to the occurrence of pain in the stomach and bleeding after the IUD. 2, oral emergency contraceptive pills: take them orally within 72 hours after sexual intercourse, because this drug contains a large number of progesterone, which may be excreted through the breast milk, and may have a certain effect on the breastfeeding babies, so it is not recommended that breastfeeding women use this method.