Ilene -
Just worked with a mom whose baby had surgery in March at Albany Medical
Center.  There they allow 3 hours before surgery. Check Ruth Lawrence, p 463
in the 1994 edition.  Quotes the Litman study ("Gastric volume and pH in
infants fed clear liquids and breast milk prior to surgery."  Anesth Analg
1994; 79:482-85.)  "Breastfed infants had no solids but were permitted to bf
up to within 2 hours of surgery."  R. Lawrence suggests "Instructions to bf
mothers should limit the amount of bf after 4 hours and permit feeding on a
prepumped breast predominantly for comfort."
I don't have anything more recent.  Check with Barbara Popper in Needham MA
(Children in Hospitals).  I know she just got published in the first issue of
the LC Series Two "The Hospitalized Nursing Baby - Meeting the Needs of
Mothers, Babies, and Families in Health Care Settings".
Good luck!
Cynthia D. Payne
LLL of Berkshire County Mass.