Inclusion criteria
HRespiratory distress syndrome, respiratory diseases, nasal flutter, polypnea, respiratory distress
RESPIRATORY DISEASE, RESPIRATORY DISTRESS SYNDROME
Infants fulfilling the following inclusion criteria will be eligible to participate:In-born at 25 + 0 to 29 + 6 weeks of gestational age.Spontaneously breathing at birth but requiring non-invasive respiratory support with nCPAP at a positive pressure of 6–8 cm HRespiratory distress syndrome (defined as respiratory distress appearing within the first 24 h of life requiring nCPAP to keep peripheral oxygen saturation above 90%, with clinical signs of respiratory difficulty such as polypnea, chest retractions, nasal flutter in the absence of other respiratory diseases non-mandatory criterion was lung images that support the diagnosis [Parental written signed consent has been obtained.