Exclusion criteria
congenital diaphragmatic hernia, congenital malformations, Inherited disorders of metabolism., congenital pneumonia, LU.Air leak syndrome
PNEUMOTHORAX, PROLONGED PREMATURE RUPTURE OF MEMBRANES, CHROMOSOMAL ANOMALIES, PNEUMOMEDIASTINUM, CONGENITAL PNEUMONIA, HYDROPS FETALIS, MECONIUM ASPIRATION SYNDROME

Endotracheal intubation in the delivery room for resuscitation or insufficient respiratory drive according to the European guidelines [Prolonged premature rupture of membranes (pPROM) for more than 3 days.Presence of major congenital malformations or chromosomal anomalies.Hydrops fetalis.Inherited disorders of metabolism.Administration of surfactant before performing LU.Air leak syndrome (pneumothorax, pneumomediastinum), congenital diaphragmatic hernia, congenital pneumonia, meconium aspiration syndrome.