Inclusion Criteria:  Children aged of 1 to 5 years ASA physical status 1 and 2 Schedule for elective non-abdominal surgery between 1-3 hours under general anesthesia without anticipation of major blood loss at Siriraj Hospital.  Exclusion Criteria:  Patients with severe neurologic, cardiac, endocrine, or metabolic disease Patients receiving intravenous fluid preoperatively Patients with history or have known risk of hypoglycemia Patient with severe liver dysfunction  Withdrawal or termination criteria  Patients requiring intraoperative blood product transfusion or inotropes infusion Patients who have preoperative hypoglycemia