Freezing does take away some of the nutrient value in
breast milk, but that doesn't mean that you have to avoid it altogether. I use ice cube trays to freeze milk into 1 ounce cubes. Then when the tray is full (14 cubes in the trays I use), I put the cubes in a vacuum sealed bag. I am currently using the ziploc vacuum seal bags, they work great. My little one is 7 weeks old and usually goes through about 10 ounces of milk at day care a day (he is there from 7am - 5pm).