How long after opening the bottle of baby milk powder can it not be consumed? Shelf life First of all, infant milk powder has a shelf life before opening. According to the instructions on the packaging, the shelf life of most infant milk powder is about 2-3 years. Infant milk powder that has expired must not be consumed because the nutrients and bacteria in it will change, which may cause indigestion and other health problems for the baby. Shelf life after opening In addition, once opened, the baby milk