After expressing breast milk, the mother can feed it to the baby right away or save it for later. Fresh breast milk has the highest quality. If the breast milk must be saved, the mother should do the following: 1. Use either a glass or hard plastic container with a large opening and a tight lid to store breast milk. 2. Use a container and a lid that have been boiled for 10 minutes. 3. Write the time and date the milk was expressed on the container before storing. 4.