High lipase breast milk

😃

So for my first baby I save up a freezer full of milk and once I start to thaw them out to feed to my baby it smell and taste so nasty my baby would not drink it and it happened to all my milk I was so upset. I’m pregnant with my second and wanted to know if there’s steps I can take thing time to prevent that from happening again I would hate to have a freeze full a milk go to waste again.