It is normal to have a period one month after delivery and there is no need to worry too much. The onset of menstruation one month after childbirth usually indicates a good recovery of ovarian function. The time to resume menstruation varies due to individual differences in physical condition, external environment, and whether or not to breastfeed. Some mothers are relaxed, not overly anxious, choose formula feeding or less milk secretion, so that prolactin does not inhibit ovulation, the uterus contraction is better, prompting the ovaries to resume ovulation sooner, so that menstruation occurs, as long as the bleeding is not persistent and large, generally do not need to worry, pay attention to contraception to avoid accidental pregnancy. Pay attention to keeping warm during menstruation and do not overexert yourself. Three days after menstruation, go to the gynecologist for ultrasound examination to prevent residues in the uterine cavity.