In BPD infants: Average gestational age: 27.8 ± 1.6 weeks; average birth weight: 1068.3 ± 259.4g; the rate of anemia requiring transfusion is equivalent to of sepsis: 95.8%; the rate of surfactant is 70.8%; On chest X-ray: 100% have hyaline membrane disease and pneumonia; 83.3% had images of BPD.