Inclusion Criteria:  Preterm newborns born <37 and >28 weeks due to MV or CPAP, hospitalized in the NICU and with a voluntary consent form from their families (with segmental lobar collapse as a result of Chest X-Ray, RDS/BPD/HMH/Atelectasis/Pneumonia/ Preterm newborns diagnosed with Chronic Pulmonary Disease or in stable condition with a thick and secretory focus on X-ray) First-time infants who have not received any chest physiotherapy program  Exclusion Criteria:  Newborn infants who have been unstable in the last 2 days (SpO₂ <60 mmHg, heart rate, blood pressure, persistent apnea, excessive increases in respiratory rate, tachycardia, nasal wing breathing, cyanosis..etc)  Newborn infants with rib fracture, hemoptysis, diaphragmatic hernia, pulmonary hemorrhage, pneumothorax Those diagnosed with any known heart disease or genetic disease Those with osteopenia-osteoporosis or thrombocytopenia Infants with any known neurological diagnosis (Abnormal MRI finding, Hydrocephalus, Chiari Malformation, Asphyxia, Periventricular Leukomolacia (PVL), Intraventricular Hemorrhage (IVH), Kernicterius, Hypoxic Ischemic Encephalopathy (HIE), Hydrocephalus) Preterm infants weighing <1000 g Infants born with congenital anomaly (Spina Bifida, Arthrogryposis Multiplex Congenita..etc) Newborns undergoing any surgery