Safety Monitoring Plan There is a slight risk for minor skin reactions from the probe. This sensor has been tested in newborns and it seems that any adverse skin events have been minimal. The probe has not yet been tested in extremely premature babies (weighing less than one kilogram at birth). We will constantly be monitoring the patient's safety during routine unit checks. The study investigators, with the assistance of NICU staff members, will identify, document, and report adverse events. A patient will be removed from the study if the skin reaction becomes severe. To carefully monitor for skin changes, photographs will be taken before and after application of the probe.