The failure of contraception during breastfeeding can be taken on the IUD or oral emergency contraceptive pill, as follows: 1. IUD: the birth control ring into the uterus, it can inhibit the fertilized egg in the uterus to bed, can achieve the purpose of contraception, its contraceptive efficiency is very high, the pregnancy rate is less than 1%, it can be placed within 120 hours after sexual intercourse. Women who are breastfeeding should be especially careful with the IUD because the uterus is soft and small, and the procedure can easily lead to the occurrence of uterine perforation. In addition, be sure to choose the right birth control ring according to the size of the uterus, otherwise it is easy to cause pain in the small stomach and bleeding phenomenon after the IUD. 2, oral emergency contraceptive pill: oral within 72 hours after sex, because this drug contains a lot of progestin, may be excreted through the breast milk, the breast-fed baby may have a certain impact, so it is not recommended that lactating women use this method.