This study will examine estimated WOB in a population of premature neonates with respiratory insufficiency currently on non-invasive support. Infants will serve as their own controls and will be studied on NIV NAVA and NIPPV. Order of assignment will be randomized. Researchers will use RIP bands to measure thoracic and abdominal movement, then calculate the phase angle (θ) as an estimate of WOB. Study personnel will measure other respiratory parameters correlating with ventilation and gas exchange including the following: tidal volume (arbitrary units, AU), minute ventilation (AU/min), respiratory rate, transcutaneous oxygen and carbon dioxide, oxygen saturation and FiO2 requirement, peak inspiratory pressure, and delivered end expiratory pressure. Investigators will also evaluate measures of breathing asynchrony to include trigger delay (time between initial increase in Edi signal and initiation of delivered ventilator flow) and asynchrony index (number of asynchrony events divided by total events, as a percent).