The low milk supply at night may be caused by limiting the number of breastfeeding times, poor nutrition, poor mood, overwork and other reasons. 1. Limit the number of breastfeeding: some women will limit the number of breastfeeding to the baby at night, the baby sucks the milk less often, can not effectively stimulate the secretion of lactation, the amount of milk will be less. 2. Malnutrition: Some women diet at night or eat very little, eat no nutritional food, long time will lead to malnutrition, will also have a small amount of milk performance. 3. Poor mood: women who have a long time of poor mood at night, the mental state of excessive tension will cause endocrine disorders, will also lead to a decrease in milk secretion. 4. Excessive fatigue: women do more housework at night, the body is overworked in the case of exhaustion, will also lead to a reduction in the amount of milk secretion. There are many reasons for the decrease in milk production in the clinic, so it is important to find out the reasons and then make targeted adjustments.