BF	Breastfeeding
CI	Confidence Interval
D2	Hospitalization Day 2
ECR	Estimated Caloric Requirements
FAO	Food and Agriculture Organization
HFNC	High-Flow Nasal Cannula
HSJD	Hospital Sant Joan de Déu
ICD-11	International Classification of Diseases, 11th Revision
IQR	Interquartile Range
LOS	Length of stay
PICU	Pediatric Intensive Care Unit
PP	Percentage Points
SD	Standard Deviation
SPSS	Statistical Package for the Social Sciences
WDFM	Modified Wood–Downes–Ferrés score
WHO	World Health Organization