1. Overview Phase I Identify normal healthy newborns (200 newborns) Phase II Explain to the family the risk benefit of the study Obtain informed consent Review to see if the baby conforms to inclusion criteria Review to see if the baby does not meet exclusion criteria Randomization to supine (car bed) or sitting position (car seat) as the 1st position Phase III Physiological testing to include oxygen saturation, heart rate, respiratory plethysmography to monitor chest wall movement.