Do you spill milk when moving it from a bottle to a milk storage bag or from a milk storage bag to the bottle? If you are a pumping mom, use your flange as a funnel so you don't lose a precious drop!
See the CDC and Academy of Breastfeeding Medicine Guideline below for breastmilk storage:
Room Temperature: 3-8 hours
Insulated Cooler with Ice Packs: Up to 24 hours
Thawed Breastmilk: Use within 24 hours
Refrigerated Milk: 5-7 days
Freezer: 3-6 months
If you are using frozen milk, you can place it in the refrigerator overnight. Or place it in a container of warm water. Do not thaw frozen breastmilk at room temperature, in the microwave, or in boiling water.