I think for a lot of women, they stop having intense let-downs and stop
being quite so engorged at 3-4 months as their breasts settle into a routine
of making just enough milk at a slow steady pace, to support the needs of
the child, as indicated by sucking frequency and milk removal.  Women with
little experience of lactation often expect to feel those heavy breasts and
strong, tingling let-downs forever, not realizing that they go away
normally.  So one has to be able to distinguish between true decrease in
milk supply, to below-needed levels, and simply the disappearance of the
obvious physical symptoms by which women were used to gauging their milk
supply.

P.S.  If I had four young children close in age, a husband who was gone a
lot, and wanted to breastfeed but my husband was unsupportive, I'D BE
DEPRESSED TOO!  Why not think about getting this mom some help with the
factors CAUSING the depression, beginning with her husband!, instead of
thinking first of medication to treat the SYMPTOMS.  Can you'all tell this
is one of my pet peeves??
Katherine A. Dettwyler, Ph.D.
Associate Professor
Department of Anthropology
Texas A&M University