Protein sources in formulas:
Breast milk can be kept (a) at room temperature for 4 hours; (b) in the fridge for 3 days (ideal) to 8 days (acceptable); (c) in the freezer for 3 months (d) in deep freeze for 6 months (ideal) to 12 months (acceptable). If transporting breast milk in a ‘cooler’ with ice packs, use within 24 hours.
Infant formula can be kept at room temperature for 2 hours. If formula is partly used, finish the rest within one hour from the start of the feeding. Formula should not be refrozen. Prepare only as much as you will need. Formula prepared from powder can be stored in the fridge for up to 24 hours. Liquid formula (ready-to-feed or prepared from concentrate) can be stored in the fridge for up to 48 hours. Finish powdered formula within one month after opening the can; store the can of powder in a cool dry place, not in the refrigerator or freezer.