Here are the citations from my collection:

Schreiner, M.S. Preoperative and postoperative fasting in children.
Ped Clinics N Amer 1994; 41(1):111-20. [Preoperative fasting time for
breastfed children is shorter. Breastfeeding may continue until 3
hours before arrival time at the hospital in healthy children having
elective surgery.]

Litman, R.S. et al. Gastric volume and pH in infants fed clear liquids
and breast milk prior to surgery. Anesth Analg 1994; 79:482-85. [Three
hours appears to be a reasonable fasting interval before surgery in
breastfeeding infants.]

Cavell B: Gastric emptying in infants fed human milk or infant
formula. Acta Paediatrica Scandanavia 1981; 70:639

Pildes RS, Blumenthal I, Ebel A. Stomach emptying in the newborn.
Pediatrics 1980; 66:482-483

Newell SJ, Chapman S, Booth IW: Ultrasonic assessment of gastric
empyting in the preterm infant. Archives of Disease in Childhood 1993;
69:32-36

J. Rachael Hamlet
Author, The Breastfeeding Advocacy Page
http://www.clark.net/pub/activist/bfpage/bfpage.html