This is just my opinion, and I could be wrong.  But, I'll give it anyway.  I think that I would focus on helping everyone realize that the big sister is STILL A CHILD.  She is not to be placed in a position of parenting this new baby in any way.  It is very easy to slide into giving older children adult responsibility.  I have been guilty of some myself.
 
I could recommend a couple of books, but they have nothing to do with lactation, so I'd better stop here.
Melissa Senf
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