Wash your hands well with soap and water. If soap and water are not available, use an alcohol-based hand sanitizer that contains at least 60% alcohol.
Mothers can express breast milk by hand or with a manual or electric pump.
If using a pump, inspect the pump kit and tubing to make sure it is clean. Discard and replace moldy tubing immediately.
If using a shared pump, clean pump dials, power switch, and countertop with a disinfectant wipe.
Storing breast milk after expressing:
Do you have other questions, such as where to store breast milk at work, and what to do when the power goes out?
Use breast milk storage bags or clean, food-grade containers to store expressed breast milk. Make sure the containers are made of glass or plastic and have tight fitting lids.
Avoid bottles with the recycle symbol number 7, which indicates that the container may be made of a BPA-containing plastic.
Never store breast milk in disposable bottle liners or plastic bags that are not intended for storing breast milk.
Freshly expressed or pumped milk can be stored:
At room temperature (77°F or colder) for up to 4 hours.
In the refrigerator for up to 4 days.
In the freezer for about 6 months is best; up to 12 months is acceptable. Although freezing keeps food safe almost indefinitely, recommended storage times are important to follow for best quality.
Source: CDC