Neonatal parenteral nutrition (PN) remains a cornerstone of care for preterm infants and for selected term infants when enteral feeding is not possible or is clearly insufficient. In day-to-day neonatal practice, decisions about when to initiate PN, how quickly to advance macronutrient delivery, which lipid emulsion to use, and how closely to monitor biochemical tolerance are guided by several major documents rather than by a single universally adopted standard. This expert narrative review compares the principal recommendations from ASPEN, NICE, and the ESPGHAN/ESPEN/ESPR/CSPEN pediatric PN guideline series, and interprets them alongside contemporary trials, systematic reviews, meta-analyses, and clinically relevant safety guidance. Across these sources, there is broad agreement on the essentials: start PN early when clearly indicated, introduce amino acids and lipids without unnecessary delay, individualize glucose delivery according to tolerance, provide vitamins and trace elements early, and monitor closely for electrolyte disturbances and catheter- or liver-related complications. The remaining areas of disagreement are narrower but important at the bedside, particularly the upper limits of amino acid provision, timing of PN in critically ill term infants, routine use of standardized versus individualized formulations, interpretation of triglyceride concentrations, and the clinical role of mixed-oil or fish-oil-containing lipid emulsions. A practical reading of the literature suggests that the most workable neonatal PN pathway borrows the operational detail of NICE, the physiologic and subgroup-specific framework of the European guidance, and the evidentiary caution emphasized by ASPEN.
Aditya Bhatt (Fri,) studied this question.