Hi, in response to Lechia Davis's post on refreezing breastmilk, secretory IgA is more resistant to being broken down than most proteins (it needs to be stable so it isn't broken down too easily in the gut), and can survive freezing and thawing. Immune protection in breast milk also comes from other proteins, peptides, carbohydrates, lipids and cells, some of which, particularly the cells, WILL be inactivated by freezing and thawing. So, frozen/thawed breastmilk is less protective than unfrozen milk, but still greatly superior to ABM. Regards, Hilary Cadman