The storage of milk powder at a constant temperature of 40 ℃ generally refers to the brewed milk powder, brewed milk powder in the case of 40 ℃ insulation storage should not exceed a maximum of 3 hours, generally within 1-2 hours. The nutritional value of milk powder is very high, which is rich in carbohydrates, proteins, fats, and various minerals and vitamins, not only to meet the needs of baby growth and development, for a variety of microorganisms is also a good medium. The storage of brewed milk powder at a constant temperature of 40°C is very conducive to the growth and reproduction of various microorganisms, and can theoretically be shelf-stable for 3 hours, but in practice, in order to keep your baby safe after eating milk and avoid gastrointestinal symptoms, it is best to feed your child within 1-2 hours, and the longer the storage time in such a temperature, the more the various nutrients in the milk powder are destroyed, and the lower the nutritional value.