Terri said: <avoidance diets in mothers are not effective in
preventing development of allergy>

I'm not sure what you're saying/asking here. [Baby is having intestinal 
reactions to cow's milk proteins and that's commonly called allergy, 
especially in babies, but others like to save the term for 
respiratory/hives type reactions]. 

I THINK you might be reading studies where mom avoids certain foods 
during pregnancy and early lactation in attempt to prevent a child from 
developing certain allergies or sensitivities when a family is allergy-
prone. No there's not a lot of luck here (some). BUT, if a child is already 
reacting to something then absolutely the child benefits from avoidance 
of this food (in mom's milk or otherwise). Their best chance of having 
healthy non-inflamed intestines with good absorption of all nutrients is 
by not regularly experiencing intestinal reactions to foods (and even 
eczema nearly always involves intestinal reactions measurable in 
science lab studies) and their best chance for "outgrowing" the 
sensitivity is by keeping the inflammation down and the antibody levels 
down (avoiding) for a lengthy period of time (that will be different in 
every child; maybe a year, maybe two, and a few never outgrow some 
food sensitivities). 

On the other hand, it's very common for a child who is reacting to cow's 
milk proteins to develop other food sensitivities if the reactions go on 
for some time. The inflamed & irritated (some say "leaky") intestines 
begin allowing other kinds of proteins to pass through the intestinal 
wall (milk proteins are designed to pass through intestinal wall and 
baby intestines are designed to accept them, human milk proteins that 
is) and in a child who has already reacted to CM proteins, other 
reactions are likely to develop.

If baby is "sensitive/intolerant" to CM proteins, this seldom converts to 
what allergists call true allergy (if that's what's being implied here). It's 
all a muddy picture in terms of the word "allergy," as allergists, or peds 
using standard allergy tests, will call something an allergy if they find 
IgE antibodies (whether it's intestinal or respiratory), and if they don't 
find them, they say it's not and allergy (and sometimes infer that the 
symptoms can be ignored then). Regardless, if a food that doesn't 
bother most people makes someone not feel well, have diarrhea, break 
out in rashes, or otherwise sick, it's not pleasant nor healthy (and it's 
the original meaning of an allergy) AND the way that allergists often 
like to say "It's not an immune reaction" if they don't find IgE 
antibodies on blood or scratch tests is such a funny thing because 
immunologists and other PhD's studying food reactions know that there 
are IgG, IgA, IgM, various interleukins, mast cells and their various 
mediators, TGFb, TNF, T cells, and all kinds of Immune System 
components that are involved in the various kinds of food reactions that 
people have.

Linda F. Palmer, DC
"Baby Matters, What Your Doctor May Not Tell You About Caring for 
Your Baby"

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