Paeds · fetal-neonatal-and-perinatal
Parenteral nutrition in neonates
Also known as Neonatal parenteral nutrition · Neonatal PN · Total parenteral nutrition in the newborn · Intravenous nutrition for preterm infants · Parenteral amino acid and lipid therapy in neonates
Fellowship guide to parenteral nutrition in neonates: why the preterm newborn faces a catabolic crisis if starved, the composition and advancement of the PN admixture (amino acids, glucose, lipid), central versus peripheral access, the monitoring schedule, the stepwise transition to enteral feeding, and the complications — catheter sepsis, PN-associated cholestasis (IFALD), metabolic derangement and refeeding — that define safe practice.
On this page
Study tools
Your progress
Saved on this device.
Practise this topic
Target exams
Red flags
- Refractory metabolic acidosis, rising ammonia or encephalopathy in an infant on PN — inborn error of metabolism unmasked by catabolism
- Persistent cholestasis (conjugated bilirubin rising, hepatomegaly) on long-term PN — PN-associated liver disease (IFALD) requiring lipid modification
- Fever, line-site inflammation or new respiratory instability with a central line in situ — catheter-related bloodstream infection
- Glucose above 10 mmol/L or below 2.6 mmol/L despite titration — glucose infusion rate mismatch or hyperinsulinaemia
- Triglycerides above 2.5–3.0 mmol/L on lipid infusion — lipid intolerance risking pancreatitis and fat overload
- Falling phosphate, potassium or magnesium when nutrition is initiated or escalated — refeeding syndrome in a depleted infant
Life stages
Care settings
Clinical exam formats
Board mappings
- Neonatal and Perinatal Medicine
- Nutrition and fluid management of the newborn
- Current 2026 PREP curriculum — Learning Objective 1.1.3: Provide nutritional support to the preterm and term neonate
- Current 2026 PREP curriculum — Learning Objective 3.4.1: Manage complications of parenteral nutrition including cholestasis and line sepsis
- Renewed curriculum for first-year trainees from 2027 — Learning goal 6: Clinical management – essential general paediatrics
- Renewed curriculum for first-year trainees from 2027 — Learning goal 11: Acute care and procedures
- Clinical Applications
- Medical Sciences
- Long Cases
- Short Cases
- Neonatal medicine: nutrition and metabolism of the newborn
- Neonatal medicine: management of the preterm infant
- Patient safety, including safe prescribing and line management
- Foundation of Practice (FOP)
- Theory and Science (TAS)
- Applied Knowledge in Practice (AKP)
- Clinical
- History
- Development
- Communication
- General Pediatrics Content Outline — Domain 5: Understanding the Neonate
- General Pediatrics Content Outline — Domain 12: Nutrition and nutritional disorders
- General Pediatrics Content Outline — Universal Task 4: Management and Treatment
- Patient Care 4: Pharmacotherapy and parenteral nutrition management
- Patient Care 5: Patient Management
- Medical Knowledge: neonatal metabolic and nutritional physiology
- Systems-Based Practice: aseptic line care and neonatal escalation
- Medical Expert
- Neonatal-Perinatal Medicine
- Pediatrics: Foundations EPA #4 — Providing care to a healthy and preterm newborn
Two philosophies that must be reconciled
Early aggressive PN
Late / withholding PN
Overview & Definition
Picture a 26-week infant weighing 780 g on day one of life, an umbilical venous catheter in place, the gut too immature to absorb the calories and protein the brain needs to grow. The clinical question is not whether to feed intravenously, but how fast, how much, and how to do it without infecting the line or injuring the liver. [2]
Parenteral nutrition is the intravenous delivery of macronutrients (amino acids, glucose and lipid), micronutrients (electrolytes, trace elements and vitamins) and fluid to an infant whose enteral route is absent, inadequate or unsafe. In neonatology it is most often a transitional bridge that carries the preterm or surgical newborn from the transplacental nutrition of fetal life to full enteral feeding, and only occasionally a long-term therapy for the infant with intestinal failure. [2]
The reason PN exists as a discipline is the newborn's extreme vulnerability to starvation. Most glycogen, fat and protein stores are deposited in the third trimester, so the very preterm infant is born with the smallest reserve at the highest metabolic demand. [7] The fetal accretion rate of 3.5 to 4 g/kg/day of protein is the most anabolic period of human life; failing to match it metabolically produces negative nitrogen balance, albumin fall, glucose instability and a measurable loss of brain and somatic growth that does not fully recover. Early amino acid delivery is therefore not a convenience but a developmental necessity. [4]
So the examiner's first question is always the same: when, how much, and for how long — and how do you protect the baby from the treatment while you give it? That question drives every prescription. [3]
References10ShowHide
- [1]Fivez T Early versus Late Parenteral Nutrition in Critically Ill Children. New England Journal of Medicine, 2016.PMID 26975590
- [2]Koletzko B Guidelines on Paediatric Parenteral Nutrition of the European Society of Paediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) and the European Society for Clinical Nutrition and Metabolism (ESPEN), supported by the European Society of Paediatric Research (ESPR). Journal of Pediatric Gastroenterology and Nutrition, 2005.PMID 16254497
- [3]Joosten K ESPGHAN/ESPEN/ESPR/CSPEN guidelines on pediatric parenteral nutrition: Energy. Clinical Nutrition, 2018.PMID 30078715
- [4]van Goudoever JB ESPGHAN/ESPEN/ESPR/CSPEN guidelines on pediatric parenteral nutrition: Amino acids. Clinical Nutrition, 2018.PMID 30100107
- [5]Lapillonne A ESPGHAN/ESPEN/ESPR/CSPEN guidelines on pediatric parenteral nutrition: Lipids. Clinical Nutrition, 2018.PMID 30143306
- [6]Domellöf M ESPGHAN/ESPEN/ESPR/CSPEN guidelines on pediatric parenteral nutrition: Iron and trace minerals. Clinical Nutrition, 2018.PMID 30078716
- [7]te Braake FW Amino acid administration to premature infants directly after birth. Journal of Pediatrics, 2005.PMID 16227030
- [8]Puder M Parenteral fish oil improves outcomes in patients with parenteral nutrition-associated liver injury. Annals of Surgery, 2009.PMID 19661785
- [9]Trivedi A Early versus late administration of amino acids in preterm infants receiving parenteral nutrition. Cochrane Database of Systematic Reviews, 2024.PMID 38275196
- [10]Hojsak I ESPGHAN Committee on Nutrition Position Paper: Intravenous Lipid Emulsions and Risk of Hepatotoxicity in Infants and Children — a Systematic Review. Journal of Pediatric Gastroenterology and Nutrition, 2016.PMID 26825766