Naomi, I just sent for this kind of info from the Center for Breastfeeding Information (LLLI). I got a list of several references which give waiting times after bf of 2 hours and 4 hours. More pointing to the 2 hours. All considered bm a clear fluid. I am using this info with my son's dentist at the moment. Documentation is listed as - Anesthesia 1990 72:593 Schriener MS et al Anaesthesia Intensive Care 1990 Nov 18(4) :527-31 van der Walt JH et al (abstracted on MEDLARS II from Niles Newton, Ph.D.) Lisa