Deficiency of qi and blood can easily lead to low milk production for the following reasons: 1. The production of milk requires the circulation of qi and blood, and the blood thus passes through the mammary glands and produces milk. If qi and blood are weak, the ability to promote blood flow will be reduced, and then the blood flow in the mammary glands will be reduced, showing less milk. 2, qi and blood are weak so that the spleen and stomach transportation function will be reduced, the spleen and stomach is the source of qi and blood, the root of the day, qi and blood are weak will lead to a decline in the spleen and stomach transportation of raw materials in the food, so the mammary glands do not get raw materials to replenish the milk, because of lack of raw materials for milk production, so that the breast milk is relatively small.