Inclusion Criteria:  Birth weight <1250 gr Being intubated within the first 7 days of life and then followed on mechanical ventilation Being intubated for at least 48 hours Not completing the postnatal 60 days Meeting conventional clinical extubation criteria Having planned extubation for the first time Having no air leakage occurred Having no structural heart and lung disease Having no congenital and chromosomal anomalies Having an intact diaphragm Having no PVL, IVH (Grade 2 and above), HIE, meningitis or known CNS anomaly during extubation  Exclusion Criteria:  Infants with a gestational age of 34 weeks or more Infants with unplanned and spontaneous extubation Infants who have tried extubation before Infants with hydrops fetalis Infants with chest deformities Infants with central respiratory failure (insufficient respiratory effort/control or continuous apneic) Infants who are neurologically depressed and do not have spontaneous breathing (hypocarbia due to hyperventilation, presence of severe sedation, use of neuromuscular drugs) In the presence of genetic or congenital anomalies (esophageal atresia, severe diaphragmatic hernia, diaphragm paralysis) Having phrenic nerve damage Presence of congenital myopathy Having any air leakage Having structural heart and lung disease Having no intact diaphragm Having PVL, IVH (Grade 2 and above), HIE, meningitis or known CNS anomaly during extubation