Dear Cindy, as far as I know the reason not to nurse on the affected side
(if no mastectomy-as this mom had) would be because radiation would have
changed the internal structure of the breast and the affected side is then
more likely to get plugged ducts and/or mastitis.  I had a mom who had
lumpectomy on one side with radiation.  She used that breast when nursing
her first baby and found it made less milk and the mastitis did become
problematic.  so she basically weaned from the affected side and nursed
with her remaining, non cancerous breast.  She didn't have the problem of
the saline implant, which may or may not cause decreased supply r/t the
implant.  If supply is Ok I say go for it.

I think what the nurses are referring to is the higher chance that she will
get br ca in the remaining breast.  But I believe the nursing would be
protective.  The fact that this woman has premenopausal br ca is the big
problem, not that she is breastfeeding. Premenopausal br ca seems to be
more aggressive and frequently reoccurs or  shows up elsewhere.

I learned all this at a conf at Mt. Sinai in NYC.  Sorry I can't remember
the breast surgeon's name or find my conf notes.  Maybe someone else can
help.
Sincerely, Pat in SNJ