Forced Oscillometry in Infants with Bronchopulmonary Dysplasia

This non-invasive device will measure pulmonary mechanics in spontaneously breathing premature infants and term infants without pulmonary disease. Infant will be in supine position and breathing regularly. A cushioned mask will be placed on the infant's face, covering the nose and mouth. Measurements typically take less than 20 seconds and no more than 3 repetitions will be done at each time point.