Jan/Laurie: does yeast survive freezing? ..... i keep the yeast ( which is origionally freeze dried) in the freezer that i use for baking bread. clearly yeast survives. BUT... does yeast in breastmilk survive or does the milk inactivate it? that is a better question. I think that the other factor is that at the later date of giving themilk if the body system is "strong" the yeast will not be a problem. Patricia