Kris:  I don't have the reference handy, but I recently saw an abstract
showing a reduced risk of uterine cancer with breastfeeding.  If anyone
else has it handy, please post.  In the meantime, I would ask that doctor
to produce his studies showing increased uterine cancers due to
lactation.  Bet you'll find the one with reduced risk quicker than he can
produce any to back up his assertion (which you correctly presume he must
be basing on postmenopausal and other unphysiologic unopposed estrogen
exposures).  Good luck, Alicia.  [log in to unmask]