Estrogen and progesterone levels return to normal 1 week after delivery, prolactin returns to normal in 2 weeks if not breastfeeding, and only after breastfeeding stops for those who are breastfeeding. Normally, as the fetus and placenta are delivered from the mother during labor and delivery, and the placenta is unable to provide continued hormonal support to the mother, hormone levels in the mother begin to decline, and estrogen and progesterone return to their pre-pregnancy levels after 1 week. Prolactin in women who do not need to breastfeed can return to normal 2 weeks after delivery. Although women with breastfeeding needs lose the hormonal support provided by the placenta, in order to maintain normal lactation function, the body’s prolactin level is high, which can inhibit the recovery of ovarian function, the patient’s hormone levels return to normal in an average of 4-6 months, there are individual differences. It should be noted that ovulation occurs before the onset of menstruation. Although the hormone level of postpartum women has not yet recovered, there is still a possibility of pregnancy, and contraceptive measures should be taken.