Storing Breast Milk
Sometimes using a breast pump is useful in tiding over the time you are away from your baby – for work, gym, or your doctor’s visit. This expressed milk can be stored in two ways: either refrigerated or frozen. Refrigerated expressed breast milk should be used within 48 hours, but if you’re freezing your breast milk it can be used for up to 6 months.
Source: Nelson's Paediatrics, 20th Edition (2016)