1. The definition and significance of the shelf life of infant milk powder. The shelf life of infant milk powder refers to the fact that the milk powder can still maintain its original quality and nutritional content after a certain period of time under specified conditions. For newborns and young children, milk powder is one of the important food sources, so it is very important to ensure the quality and safety of milk powder. Understanding the meaning and significance of the shelf life of infant milk powder can help parents choose and use milk powder correctly. 2. Different types