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©2013 UpToDate ® Print Email Caloric balance PN preterm Concentration, percent g/kg/day kcal/kg/day kcals, percent Infusion rate at 135 mL/kg/day Glucose 12.5 16.9 57.5 57 Amino acids 2.5 3.4 13.6 13 Infusion rate at 15 mL/kg/day Lipid 20 3.0 30 30 Suggested distribution of energy sources in parenteral nutrition solutions for premature infants based upon an assumed total fluid intake of 150 mL/kg per day and total calorie intake is 102 kcal/kg per day.