If the menstrual flow is low during lactation, clinically, if polycystic ovary syndrome is excluded. Clinically, during breastfeeding, lactogen increases and menstrual flow decreases, which is caused by the increase of lactogen. Therefore, it is not necessary to give treatment for the time being. After stopping breastfeeding, the prolactin will gradually drop to the normal range, and we will observe whether the menstrual flow will return to the normal amount. If the prolactin returns to normal and the menstrual volume still decreases, it is recommended to observe whether the condition is caused by an endocrine disorder, such as a decrease in estrogen. After the cessation of breastfeeding, treatment can be carried out clinically with appropriate medications, such as oral supplementation with Glaxo if contraindications are excluded.