| AAP | American Academy of Pediatrics |
| CPAP | Continuous Positive Airway Pressure |
| ETT | Endotracheal Tube |
| HVH | Vall d’Hebrón Hospital |
| NGT | Nasogastric Tube |
| NICU | Neonatal Intensive Care Unit |
| OGT | Orogastric Tube |
| PTNB | Preterm Newborn |
| SSC | Skin-to-Skin Contact |
| UVC | Umbilical Venous Catheters |
| WHO | World Health Organization |