When a mother is angry, her hormone level will change and the secretion of estrogen and lactogen will decrease, which will reduce the production of milk and lead to back milk. Due to the change of hormone level in the body after delivery, the mother’s emotion is easy to fluctuate. Postpartum depression may occur and affect physical and mental health, which may affect the secretion of breast milk. If a woman gets angry occasionally during breastfeeding, her milk secretion will decrease, and if she gets angry a lot during breastfeeding, her lactogen secretion will be insufficient for a long time and she will be prone to back milk. Women should learn to regulate their emotions after giving birth, communicate more with family and friends, keep their mood happy, avoid excessive emotional fluctuations and avoid depression.