The open package of milk powder cannot be stored in the refrigerator, but the brewed milk powder can be stored temporarily in the refrigerator. The open package, not brewed milk powder, placed in the refrigerator is likely to absorb the moisture in the refrigerator and clumped, accelerating the rate of deterioration of milk powder, accelerating the loss of various nutrients in milk powder, the nutritional value of milk powder significantly decreased. The open package of milk powder should be stored in a ventilated, dry, cool, direct sunlight environment, has been brewed milk powder if not fed to the child within a short period of time, can be stored in the refrigerator freezer, the time can not exceed twenty-four hours. If the child has already eaten half of the remaining brewed milk powder, it should not be stored in the refrigerator for more than ten hours.