A woman’s menstruation will not cause a decrease in breast milk. Women’s menstruation is mainly due to the stable level of estrogen and progesterone secreted by the ovaries, which causes the endometrium to undergo cyclic exfoliation and is a good indication of the recovery of ovarian function. The amount of female breast milk secretion is mainly related to whether women have enough nutritional supply and are able to eat oily soup food, the secretion of breast milk will increase. Pay attention to the regularity of life, avoid staying up late and getting cold, and diligent breastfeeding of infants is conducive to the normal secretion of breast milk, which can moderately improve the quality of milk secretion and promote the growth and development of infants. When a woman is pregnant while breastfeeding, the secretion of breast milk will decrease. If a woman is having her period normally while breastfeeding, don’t worry, it will not affect the decrease of breast milk secretion.