There may or may not be direct medical benefit to the infants involved in this study. The infants will have continuous carbon dioxide and oxygen monitoring during the study and if any patient has any problems, study personnel will be able to detect and respond to this quickly. If a patient shows improvement while using NAVA, investigators may be able to suggest to the treatment team that this mode be continued. If using NAVA improves work of breathing in babies, then the researchers hope the information learned from this study will benefit other infants needing respiratory support in the future.