Jane,
In my experience, women who choose to pump rather than breastfeed for
"convenience" rarely last more than six weeks.  It's no wonder, since
pumping and dealing with bottles AND having to feed a baby is
anything but convenient!  I always tell these mothers that it will be
double the work.  I am saddened by the number of mothers who choose this
option.  Sure, the breast milk is important, but just pumping when a
baby is actually able to nurse is treacherously close to abm-feeding.
(Hence the reluctance to continue pumping for very long.)  The feedings
are generally scheduled, mom often is not involved, and the temptation
to encourage the baby to finish the bottle is very strong.  The only
difference is in the product the baby is being fed.  Of course breast
milk is a superior product, but when the process of breastfeeding is
undervalued, then we all lose.

Becky Butler, IBCLC
Waldorf, MD