Mammary gland passes the milk is less related to emotional tension, improper diet, postpartum prolactin secretion is less related to the reduction of milk and hormone, hypothalamus regulation. Suppressed mood during breastfeeding will stimulate adrenal secretion to reduce blood flow, which will prevent nutrients and hormones from entering the breast, so there will be a decrease in milk. By avoiding mental stress, it can play a role in promoting milk secretion. Diet is also very important during breastfeeding. In summer, when the weather is hot, many people like to eat cold drinks, and eating cold food will affect milk secretion, and eating chilled food will lead to blood vessel contraction. When the nutrients can not reach the breasts will affect milk secretion, and at the same time, eating cold food during breastfeeding will also lead to diarrhea in the baby. Due to postpartum endocrine disorders, emotional stress, lack of sleep will make the body lactogen content is low, the body’s lactogen is endocrine regulation, when the mood is not good endocrine changes will affect the secretion of breast milk, so that the milk gradually reduced.