Hi Matthew 
All the components of human milk are crucial to the development of human
babies.  Millions of years of evolution (or clever design) have seen human
milk develop to meet the needs of human infants precisely. 
That said, if one component (or a portion of it) must be sacrificed to
protect another, I would vote for secretory IgA.  I would make this choice
because infants who are being fed (human) milk that has been stored are
likely to be at risk of infection. They are likely to be premature, in group
child care, separated from their mothers or in hospitals.  Of course this is
not the case for all infants who are fed expressed human milk.  
Now, that said, you also need to examine the integrity of these components
as they are likely to be treated in the real world.  Milk that is stored may
be frozen (in a deep freeze) for as long as twelve months, then thawed under
running water (tepid) - your experiments will be pointless if the components
are destroyed by normal handling.
Good luck
Nina Berry
University of Wollongong
Australia

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