How long should you not consume powdered milk when it is open

Milk powder can’t be consumed if it’s been open for more than a month.
The milk powder is rich in protein, fat, vitamins, trace elements and other nutrients, after the opening is easy to contact with pathogenic microorganisms in the air, when the opening time is too long it is easy to lead to bacterial growth, after eating may cause enteritis, indigestion and other reactions, so, the milk powder after the opening for more than a month can not be consumed.
At the same time, after the opening of the milk powder should also pay attention to the storage in a cool dry place, and after the use of the bottle to cover the lid, minimize the contact time with the air, so as to reduce the chances of bacterial growth, maximize the quality and safety of the milk powder to ensure that the bacterial contamination to reduce the occurrence of digestive system diseases.