Breast milk should not be stored at room temperature for more than 2 hours, because the air contains a lot of bacteria, and too much time will lead to the multiplication of bacteria in breast milk, which may cause acute gastroenteritis when the baby eats breast milk containing bacteria, such as nausea, vomiting, bloating, diarrhea and bouts of crying. Breast milk is not recommended to be stored for more than 24 hours under refrigeration, while it can be stored for 3 months under freezing, but the conditions of the refrigerator are more demanding, requiring the use of a special refrigerator, the need to adjust the appropriate temperature, and the need to drink it in time after taking it out to avoid secondary freezing. At present, it is recommended that babies before 6 months of age be exclusively breastfed, because breast milk contains a large amount of immunoglobulin, which can enhance the baby’s resistance, and breastfeeding can also promote the recovery of the mother’s uterus and body.