Despite strict hand washing, sterile technique, and antibiotic-coated catheters, nosocomial infection and sepsis remain the leading acquired causes of morbidity and mortality in critically ill children. Subsequent use of antibiotics to treat nosocomial infection and sepsis is considered a major attributable factor in the rise of antibiotic-resistant organisms in this population of children. This study will use a double-blind, randomized, controlled trial design to test the hypothesis that daily prophylaxis with metoclopramide, zinc, selenium and glutamine will reduce nosocomial infection and sepsis in critically ill children.