Terri:  If she's anti-HBs positive and HBsurface antigen negative, then
she is no longer
infectious even now during the pregnancy, so how could she infect the baby
after birth?  She may have infected the baby early in the pregnancy, but
that would certainly have no effect on whether or not she could
breastfeed.  Even mothers who are HepB surface antigen positive can
breastfeed, since the vaccine is given to the baby at birth anyway, and if
there is really a concern about infectiousness, HB immune globulin (HBIG)
can be given, so there's no need to wait until the vaccine is given.  To
quote from Dr. Lawrence's "Breastfeeding:  A guide for the medical
profession", 4th edition, p.490-1:  "With the immediate administration of
protection...the infant may be breastfed in this country and worldwide.
Infants breastfed in Taiwan and in England by mothers who are HBsAg
positive have had no increased risk of the disease."
Hope this helps.  Alicia.