During breastfeeding if one breast produces more milk and the other breast produces less milk, this is due to the incorrect breastfeeding habits of the mother. If the baby often eats one breast and the other breast is less stimulated by sucking, the breast that eats more will secrete more milk, while the other breast that is less stimulated by sucking will secrete less milk, and the size of both mammary glands will change over time, with the breast with more milk being larger and the other breast with less milk being smaller. The way to deal with this is to change the mother’s breastfeeding habits, so that the baby can try to suck more to stimulate the side of the breast with less milk, and properly reduce the sucking stimulation of the breast with more milk, so that after a period of time the milk secretion of both mammary glands will be close to the same.