Taking Tongzhi to promote lactation usually may have some effect in 3-5 days. Tongzhi is a Chinese herb that has the effect of promoting the flow of qi and lowering breast milk. The whey proteins, carbohydrates, minerals and other nutrients contained in the grass can be used to treat postpartum lactation. Breastfeeding women may have poor daily rest, excessive fatigue, inadequate diet and nutrition, etc. It is usually taken for 3-5 days and may show some effect. Some women who fail to discharge milk in time while breastfeeding may also experience low milk production. In this case, massage and hot compresses on the breasts can be used to unblock the mammary ducts and stimulate mammary secretion, or letting the baby suckle and use a breast pump to empty the secreted milk will also help in the secretion of milk again. It should be noted that prolonged use of Tongzhi may cause some damage to the kidneys, and it is recommended to standardize the use of the medicine under the guidance of a Chinese medicine practitioner.