All patients will have FiO2 adjusted to maintain post-ductal oxygen saturation of 88-92% and will continue to receive nasal CPAP until either reaching failure criteria, or until FiO2 < 30%. If a subject does not reach failure criteria, nasal CPAP will be weaned to off and the baby will be place in an oxygen hood until FiO2 = room air. Babies may then be removed from the hood and returned to supplemental oxygen as clinically indicated.