The main reasons why daytime milk is not enough at night are emotional instability, vagus nerve excitement at night, and less frequent breastfeeding at night. 1. Emotional instability: breastfeeding may affect the secretion of milk during the day if there are prolonged periods of tension, anxiety, irritability, depression and other unstable emotions. 2 Vagus nerve excitation: vagus nerve excitation at night may also lead to increased milk secretion. 3. Less frequent breastfeeding: More frequent breastfeeding during the day may result in insufficient milk. Less frequent breastfeeding at night, the phenomenon of breast swelling and more milk. Pregnant women who do not have enough milk can usually drink more soup food to increase milk secretion. If milk-resistant swelling occurs, you can increase the number of baby nursing appropriately to avoid the occurrence of mastitis.