Since powdered formulas cannot be sterilized, it is important to take extra special care when handling these products. Reduce the risk of infection with proper handling of formula and related supplies.
1) Start with clean hands and equipment. Wash all mixing tools in hot, soapy water, rinse well then allow to air dry.
2) Check the date. Before opening a can of powdered formula, check the can’s use-by date. The nutritional quality of the product cannot be guaranteed after this date has passed. If you are using a modular product, such as Duocal, Benecalorie or Beneprotein, write the date the can was opened on the top of the lid. After one month, consider the opened can expired and open a new can.
3) Store prepared formula in the refrigerator and use within 24 hours.
4) Stick to the recipe. Follow your healthcare provider’s directions exactly when preparing formula.
Reference: http://www.cdc.gov/