Collection of baseline variables: Baseline demographic characteristics, maternal and delivery characteristics including maternal age, prenatal clinic attendance, antenatal steroids given, maternal diabetes, illicit drug use, preeclampsia, prolonged rupture of membrane, chorioamnionitis, abruption, previa and cesarean section will be collected. Baseline infant characteristics such as gender, obstetrical GA, birth weight, intrauterine growth restriction, breech presentation, multiple pregnancies, cord blood gas pH, base deficit will be recorded. This data will be collected from the electronic medical records by research nurse and Parkland neonatal intensive care unit database which collects this information on all the infants admitted to Parkland NICU.