Hair loss after childbirth is medically called postpartum hair loss. Postpartum hair loss usually occurs 4-20 weeks after delivery, and after 20 weeks it basically returns to normal. The first cause of postpartum hair loss is hormonal changes. The rate of hair replacement in women is closely related to the level of estrogen in the body. If estrogen increases, the rate of hair loss will slow down, and if estrogen decreases, the rate of hair loss will speed up. Within 6 months after childbirth, the function of sexual organs is in the recovery stage, and the secretion of estrogen is significantly reduced, which will cause hair loss. The second is the mental factor, some women before and after childbirth, because of various reasons emotional instability, or mental stress, resulting in the body metabolic disorders, nutrient supply is insufficient, will induce hair loss. In addition, dietary factors, postpartum is the breastfeeding period, if the maternal digestive and absorption function is poor, or diet is too monotonous, partiality, or even some maternal diet in order to maintain a slender body after childbirth, are prone to nutritional deficiencies or nutritional imbalance, resulting in insufficient supply of protein, vitamins or minerals in the body, which affects the growth and metabolism of hair, so that the hair withered, easy to break. There are also care factors, influenced by the traditional concept, some mothers are afraid to wash their hair and comb their hair during the menstrual period, so that the sebum secretions and dust of the hair mix and accumulate, which affects the blood supply to the head and easily causes folliculitis and scalp infection, making the probability of hair loss increase. If hair loss continues after 20 weeks postpartum, most of it is caused by insufficient qi and blood. If it is long-term, it needs to be regulated with medication.