 Standard NICU care will be provided to all subjects. Serial exams, CBC-d, reticulocyte counts, serum Epo levels, serial HUS, and head MRI will be collected at established time points during the study period. At 18 to 22 months corrected age, subjects will undergo a neurodevelopmental evaluation assessing for cerebral palsy, Bayley Scores of Infant Development-II BSID-II Mental Development Index MDI, BSID-II Psychomotor Development Index PDI, bilateral hearing aid use, and visual impairment. 