Rachel:

<<  I'd like to know what term I should use throughout my paper.
  breast milk
 breastmilk
 human milk
 some other word? >>

I like the words human milk because your paper is dealing with a specific
substance that is distinct from other mammal milks.  While I will use the word
breastmilk, it always strikes me as funny - where else would the milk come
from? :-D
Jeanne Fisher
Austin, TX