I have milk in our sidebyside that is 60 days old. If I were to purchase a deep freeze, can I move it in there? And if so, how long would it stay good since it originally wasn't kept in there?
So not an expert here, but I think you'd be fine for several more months. Just rotate yoru stash, and you'll probably use that milk up in the next few months, so you should be safe. If you get a deep freeze, then you start putting milk in there straightaway, and that milk will be good for up to 12 months.
Kellymom.com says you can keep milk in a side-by-side freezer for up to 6 months:
Re: Moving to a deep freeze
So not an expert here, but I think you'd be fine for several more months. Just rotate yoru stash, and you'll probably use that milk up in the next few months, so you should be safe. If you get a deep freeze, then you start putting milk in there straightaway, and that milk will be good for up to 12 months.
Kellymom.com says you can keep milk in a side-by-side freezer for up to 6 months:
https://kellymom.com/bf/pumpingmoms/milkstorage/milkstorage/