Hi -

I've been investigating this topic thoroughly, and the word is:

If you have a reason to suspect milk allergy in a baby, or if you
have milk allergy in the family, then the first thing you should try
is to have the baby feed strictly on breastmilk AND the lactating mother
should maintain a strictly dairy-free diet.  It turns out that most INFANT
milk allergy is to COW'S milk protein, not to human milk protein.  (Usually
this is to one of the three varieties of casein -- I can't recall which
one.)  A strictly breastmilk diet seems to avoid allergy in the infant,
and in fact makes the statistical baby less prone to food and other
allergies later in life.

It's a very rare baby who's truly allergic to human milk.  In that case,
a hypoallergenic formula (or soy formula, if that's an option) is your
best bet.  But it's NOT unusual for the baby to be allergic to something
in the lactating mother's diet.

I hope this helps!
--Beth Kevles
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  http://web.mit.edu/kevles/www/nomilk.html -- a page for the milk-allergic