Dear Jane, I totally agree that it is the overdose of anything (milk, oj
etc)during pg that can cause the problem.  After a certain stage of
maturity many allergic kids can tolerate a small amount of the offending
item, but an "overdose" or several things at once can cause an overload on
system and tip the kid over into problems.  I think I read this theory from
Dr. Crook's info.
I plead moderation to parents, pre and post natally.  Sincerely, Pat in SNJ