| VLBW | Very Low Birth Weight |
| FI | Feeding Intolerance |
| GER | Gastroesophageal Reflux |
| CR | Cardiorespiratory |
| DF | Donkey Fortifier |
| BF | Bovine Fortifier |
| MII/pH | Multichannel Intraluminal Impedance and pH Monitoring |
| US | Ultrasound |
| BRE | Bolus Reflux Extent |
| BCT | Bolus Clearance Time |
| BEI | Bolus Exposure Index |
| RI | Reflux Index |
| SAP | Symptom Association Probability |
| ACSA | Antral Cross-Sectional Area |