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.

high10 referencesUpdated 12 July 202622 min readVerification in progress

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RACP General PaediatricsRACP DWERACP DCERCPCH Progress+MRCPCH TheoryMRCPCH ClinicalABP General PediatricsACGME PediatricsRCPSC Pediatrics

Red flags

Refractory metabolic acidosis, rising ammonia or encephalopathy in an infant on PN — inborn error of metabolism unmasked by catabolismPersistent cholestasis (conjugated bilirubin rising, hepatomegaly) on long-term PN — PN-associated liver disease (IFALD) requiring lipid modificationFever, line-site inflammation or new respiratory instability with a central line in situ — catheter-related bloodstream infectionGlucose above 10 mmol/L or below 2.6 mmol/L despite titration — glucose infusion rate mismatch or hyperinsulinaemiaTriglycerides above 2.5–3.0 mmol/L on lipid infusion — lipid intolerance risking pancreatitis and fat overloadFalling phosphate, potassium or magnesium when nutrition is initiated or escalated — refeeding syndrome in a depleted infant

Life stages

fetalneonateinfant

Care settings

delivery-roomnicuwardretrievalrural-remotetelehealth

Clinical exam formats

written-onlyracp-dce-long-caseracp-dce-short-casemrcpch-short-clinicalmrcpch-history-managementmrcpch-communicationrcpsc-structured-oral

Board mappings

Neonatal and Perinatal MedicineNutrition and fluid management of the newbornCurrent 2026 PREP curriculum — Learning Objective 1.1.3: Provide nutritional support to the preterm and term neonateCurrent 2026 PREP curriculum — Learning Objective 3.4.1: Manage complications of parenteral nutrition including cholestasis and line sepsisRenewed curriculum for first-year trainees from 2027 — Learning goal 6: Clinical management – essential general paediatricsRenewed curriculum for first-year trainees from 2027 — Learning goal 11: Acute care and proceduresClinical ApplicationsMedical SciencesLong CasesShort CasesNeonatal medicine: nutrition and metabolism of the newbornNeonatal medicine: management of the preterm infantPatient safety, including safe prescribing and line managementFoundation of Practice (FOP)Theory and Science (TAS)Applied Knowledge in Practice (AKP)ClinicalHistoryDevelopmentCommunicationGeneral Pediatrics Content Outline — Domain 5: Understanding the NeonateGeneral Pediatrics Content Outline — Domain 12: Nutrition and nutritional disordersGeneral Pediatrics Content Outline — Universal Task 4: Management and TreatmentPatient Care 4: Pharmacotherapy and parenteral nutrition managementPatient Care 5: Patient ManagementMedical Knowledge: neonatal metabolic and nutritional physiologySystems-Based Practice: aseptic line care and neonatal escalationMedical ExpertNeonatal-Perinatal MedicinePediatrics: Foundations EPA #4 — Providing care to a healthy and preterm newborn

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Target exams

RACP General PaediatricsRACP DWERACP DCERCPCH Progress+MRCPCH TheoryMRCPCH ClinicalABP General PediatricsACGME PediatricsRCPSC Pediatrics

Red flags

Life stages

fetalneonateinfant

Care settings

delivery-roomnicuwardretrievalrural-remotetelehealth

Clinical exam formats

written-onlyracp-dce-long-caseracp-dce-short-casemrcpch-short-clinicalmrcpch-history-managementmrcpch-communicationrcpsc-structured-oral

Board mappings

The fellowship answer

Parenteral nutrition in the neonate is a bridge, never a destination — and the skill is starting early enough to prevent the catabolic crisis while protecting the line, the liver and the metabolic balance that the same therapy can endanger. The preterm newborn carries almost no glycogen, fat or protein reserve because those stores are laid down in the third trimester it never completed, so withholding nutrition converts a fragile anabolic state into negative nitrogen balance and growth failure within hours. [2] [7] Your job is to begin amino acids and glucose within the first hours of life, advance lipids and macronutrients to ESPGHAN targets over the first days, protect the central line with strict asepsis, monitor glucose and lipids and electrolytes daily, and wean PN reciprocally as enteral feeding grows — the goal is full enteral nutrition and a baby who is growing along their own centile. [4] [3] The candidate who frames PN this way already separates the harm of starvation from the harm of over-delivery, and times each decision to the patient in front of them. [1]

Two philosophies that must be reconciled

Early aggressive PN

Late / withholding PN

[7] [4]

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]

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References10Show ledger

[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

Parenteral nutrition in neonates

high10 referencesUpdated 12 July 202622 min readVerification in progress

Practise this topic

Overview & Definition

Paediatrics Fellowship Pro

You have read the opening of this topic. The complete unit — every section and its primary-source references — is part of the Paediatrics Fellowship fellowship atlas.

References10Show ledger

[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