| BPD | bronchopulmonary dysplasia |
| HM | human milk |
| ELGAN | extremely low gestational age neonates |
| FIP | focal intestinal perforation |
| GNN | German Neonatal Network |
| NEC | necrotizing enterocolitis |
| NICU | neonatal intensive care unit |
| ROP | retinopathy of prematurity |
| SGA | small for gestational age |