B ronchopulmonary dysplasia (BPD) is a chronic lung disease requiring long-term oxygen support with ≥21% concentration with a variety of modalities in premature infants. Until the 2000s, the diagnosis was made based on whether oxygen requirements continued up to the postnatal 28 th day. However, after this date, diagnosis began to be made based on the severity of the disease as mild, moderate and severe according to gestational week (GW) [1, 2]. Low birth weight (WB) and GW are usual risk factors for BPD, and there is an inverse linear relationship between them. Perinatal risk factors like a cesarean section, male gender, antenatal corticosteroids, EMR, chorioamnionitis, SGA, postnatal surfactant, RDS, early and late-onset sepsis, PDA and apnea are reported to be associated with BPD [3]. According to centers, the incidence of BPD in <32 GW premature infants was reported to be 30% in the United States, 12% in Canada and 14% in Japan [4, 5]. In this study, the relationship of BPD frequency, perinatal risk factors and other prematurity comorbidities were assessed for very low birth weight (VLBW) infants.