Studies have shown that more than 50% of women resume ovulation within 2 months after giving birth, with the shortest return to ovulation being only 14 days. Contraceptive methods for lactational amenorrhea are not very reliable, so women should use effective contraceptive measures once they start having sex after giving birth. This is not only good for the normal breastfeeding of the baby, but also to avoid damage to the health of the body. Postpartum contraceptive methods: 1, tool contraception: condoms postpartum contraception preferred. 2, external spermicide: does not affect breastfeeding. 3, intrauterine device (commonly known as birth control ring): 3 months after normal delivery or cesarean delivery for more than six months without menstruation, after the doctor’s examination to exclude pregnancy, can be placed intrauterine device, taking into account the softness of the uterus during breastfeeding, the uterus is small, we recommend that after weaning, the second normal menstruation after the end of 3-7 days to the hospital placement. 4.Levonorgestrel intrauterine device system—German imported Manuelle not only has reliable contraceptive effect, but also can reduce the amount of menstrual blood, shorten menstrual period, relieve menstrual pain, reduce the occurrence of pelvic inflammatory disease and ectopic pregnancy, the specific placement time is the 5th-7th day of menstruation. 5. Sterilization: tubal (vasectomy) ligation. It is suitable for couples who no longer intend to have children. 6.Compound short-acting oral contraceptive pill: those who do not take breastfeeding can start taking it 3 weeks after delivery. Contraceptive pill is safe, efficient, reversible, does not affect sexual life, and can also reduce the occurrence of ovarian cancer, endometrial cancer, colorectal cancer, benign tumors of the ovaries and breast, osteoporosis has a preventive effect, can treat functional uterine bleeding, treatment of endometriosis, premenstrual tension syndrome, polycystic ovary syndrome and many other gynecological diseases. 7.Monoprogestin contraceptive injection: injected once every 2-3 months, does not affect breast milk, started to use 42 days after delivery 8.Dermal burial: can be implanted after 42 days after delivery. Not recommended methods during breastfeeding: in vitro ejaculation; safe period contraception, vaginal diaphragm, compounded oral contraceptive pills