A balanced supply and demand for breastmilk is reflected by a satisfied baby after breastfeeding and no discomfort in the breasts. A balanced supply and demand of breastmilk is crucial to the growth and development of babies. Usually, when the supply and demand of breastmilk is balanced, babies will feel satisfied after breastfeeding, and will not be accompanied by crying and restlessness. At the same time, when the baby goes to the doctor for various tests, all the indicators can be seen to be within the normal range, and there will not be any abnormalities such as malnutrition, cramps, or lack of endurance in activities. In addition to the baby’s behavior, if the supply and demand of breast milk is balanced, breastfeeding women will not experience any abnormalities such as breast distension or breast milk overflow after breastfeeding. In order to ensure a balanced supply and demand of breastmilk and improve the quality of breastmilk, breastfeeding women should develop good living habits, strengthen breast care, and also pay attention to a balanced diet to ensure a balanced intake of nutrients. During breastfeeding, lactating women should pay attention to feeding on demand to avoid over-starvation or over-fullness of the baby.