I think of it as a continuum.  Colostrum is simply a specialized form 
of human milk, and mature milk is the specialized form at the other 
end of the continuum.  The 'ingredients' that make colostrum are also 
present in mature milk, just in different amounts or proportions. 
Saying that colostrum is always present in mature milk seems to me 
the same as saying that human milk is present in human milk.

Margaret
Longmont, CO

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