This is a multi-centre prospective cohort study of nutrition in paediatric critical care in Australia and New Zealand. The study is planned to run in parallel with the adult ICU cohort study, NUTRIENT. Two study periods are proposed with the first in late 2024 and the second in 2026. This observational study seeks to determine the following (although not limited to) descriptive outcomes of interest:

1. Nutritional outcomes, including route of nutrition support (oral, enteral and/or parenteral), energy and protein prescription and provision, and anthropometric measures
2. Patient-centred outcomes, including duration of invasive respiratory support and hospitalisation, and mortality
3. Nutrition service delivery in the PICU and ward settings

Inclusion Criteria:

1. All patients </=18 years of age
2. Admitted to the PICU after 00:00 on the day of the study period commencement
3. Admitted to the PICU for >72 hours

Exclusion Criteria:

1. Those previously enrolled during the study period (i.e. those re-admitted to PICU)
2. Those for end of life care only
3. Those admitted for organ donation

All children aged under 18 years admitted for >72 hours to participating PICUs during the two-week study recruitment period. Further funding will be sought to continue this study beyond the 2026 data collection period.