Following these guidelines from the Center for Disease Control will ensure you are pumping and storing breast milk safely.
Before pumping, wash your hands with soap and water.
Inspect your pump and tubing for any mold or grime.
Store your milk in sterile breast milk bags or sterilized bottles with lids.
It’s recommended to store freshly pumped breast milk in the refrigerator for up to 4 days. You can store frozen milk in the freezer for anywhere from 6 to 12 months.
You should also label each container of milk with the date it was expressed. This will help you keep track of how long the milk can be stored.