Pediatric Parenteral Nutrition Guidelines

Age Classification

Classify patients as preterm infants (< 37 weeks gestation), term infants (0–12 months), or children (> 1 year) to select appropriate nutrient targets. 1

Preterm and very‑low‑birth‑weight infants should receive 90–120 kcal/kg/day via parenteral nutrition, starting at the lower end (90 kcal/kg/day) and advancing based on growth response. This range is lower than enteral needs (110–135 kcal/kg/day) because PN bypasses splanchnic metabolism and eliminates stool losses. [2][3]
Term infants and children: calculate resting energy expenditure with Schofield’s equation, then add energy for growth and activity; the typical target is 80–100 kcal/kg/day, decreasing with age. [4][2]

Preterm infants: begin 2.5–3.5 g/kg/day of amino acids from post‑natal day 2, not exceeding 3.5 g/kg/day; ensure non‑protein calories exceed 65 kcal/kg/day. 4
Term infants and children: aim for 1.5–3.0 g/kg/day of protein, with higher per‑kg doses needed in younger infants. [4][5]

Preterm infants: initiate lipid emulsions immediately after birth or by day 2; target 2–4 g/kg/day (maximum) with a minimum of 0.25 g/kg/day linoleic acid to prevent essential fatty‑acid deficiency. Use 20 % lipid emulsions, infuse continuously over 24 h, prefer composite emulsions (avoid pure soybean oil > few days), and protect the line from light. [5][6][7][8]9
Term infants: maximum lipid dose 4 g/kg/day; minimum linoleic acid provision 0.1 g/kg/day. [5][1]
Children: maximum lipid dose 3 g/kg/day; minimum linoleic acid 0.1 g/kg/day; the maximal lipid oxidation rate is approximately 3 g/kg/day in young children. [5][10]9

Calculate remaining energy after accounting for protein (4 kcal/g) and lipids (≈10 kcal/g); dextrose provides 3.4 kcal/g.
Maximum glucose infusion rate in children is 12 mg/kg/min (≈ 17.3 g/kg/day). [2][10]9

Preterm infants: start with 70–100 mL/kg/day on day 1, advancing gradually; by the end of the first week many require 120–150 mL/kg/day based on gestational age, post‑natal age, and insensible losses. [2][5]10
Term infants and children: use the Holliday‑Segar method for maintenance fluids, adjusting for clinical conditions that require fluid restriction. [5][1]

Sodium: 2–4 mEq/kg/day (adjust to serum levels). 5
Potassium: 2–3 mEq/kg/day (adjust to serum levels). 5
Magnesium: 0.3–0.5 mEq/kg/day. 2
Trace elements: provide age‑appropriate commercial multi‑trace element solutions; exclude chromium from the formulation. 4
Vitamins: use pediatric multivitamin preparations. 4
Carnitine: consider supplementation when parenteral nutrition is expected to exceed 4 weeks. [6][7]
Heparin: do not add heparin routinely to lipid infusions. [5][6]

Verify that the non‑protein calorie provision exceeds 65 kcal/kg/day when amino acids are given. 4
Ensure the glucose infusion rate does not surpass 12 mg/kg/min. [10][9]
Confirm that lipid doses stay within the age‑specific maximums. [5][7]10
Check that the osmolarity of the solution matches the intended route (peripheral vs. central). 5
Monitor growth parameters daily (weight) and weekly (length, head circumference). 2
Adjust energy intake if growth failure is evident (e.g., dropping across weight centiles). 3
Regularly assess biochemical markers: glucose, triglycerides, electrolytes, liver function tests, and albumin. 9

Do not delay lipid initiation in preterm infants; start by day 2 at the latest. [5][6]
Avoid pure soybean‑oil emulsions for more than a few days; use composite lipid emulsions. [5][6]
Do not exceed the maximum amino‑acid dose of 3.5 g/kg/day in preterm infants. 4
Do not ignore minimal enteral feeds when total intake is < 25 mL/kg/day, as they contribute to gut stimulation. 2
Do not rely on standardized PN solutions for metabolically unstable patients or those with abnormal losses; individualized formulations are required. 11
Do not forget light protection for lipid infusions in preterm infants. [5][6]

MCT‑containing parenteral lipid emulsions (e.g., MCT/soybean oil or composite SMOF formulations) promote greater incorporation of essential fatty acids and long‑chain polyunsaturated fatty acids into circulating lipids because MCTs are preferentially oxidized, thereby sparing essential fatty acids from oxidation. [12] [13] (Evidence from clinical nutrition studies, 2018)

When using an MCT/soybean‑oil parenteral emulsion, delivering 1 g/kg/day of the emulsion satisfies the minimum linoleic acid requirement of 0.25 g/kg/day in preterm infants; a pure soybean‑oil emulsion would require 0.5 g/kg/day to achieve the same linoleic acid provision. 13 (Clinical nutrition data, 2018)

Current neonatal nutrition guidelines endorse the use of parenteral lipid emulsions that contain MCT as part of standard parenteral nutrition, whereas enteral MCT‑oil supplementation lacks strong supporting evidence and is not recommended as a routine intervention. [12] [13] 14 (Guideline‑based recommendation, 2018)

Enteral formulas in which MCT provides >40 % of total fat are linked to the development of essential fatty acid deficiency; clinicians should monitor biochemical markers of deficiency if such high‑MCT regimens are used for more than 2–3 weeks and ensure a minimum linoleic acid intake of 0.25 g/kg/day from other fat sources. 13 (Observational data, 2018)