I'm just starting out almost 7 month old on solids and want to start with sweet potatoes, however, I'm not sure about using frozen BM to mix it with. I know you are not supposed to refreeze thawed BM, so I imagine it's not safe to unthaw the BM, mix it up with the sw. potato and then refreeze it again right? Better to use fresh BM for this purpose. I tasted some of the refrozen stuff today and it had a fowl after taste, yucky!! Must mean its bad?