The purpose of this study is to compare heart rate and oxygen saturation performance between 2 pulse oximeters (Nellcor and Masimo, both approved by the U.S. Food and Drug Administration) in newborns. Pulse oximeters are devices that measure oxygen saturation in the blood. Each of these devices will have a sensor that attaches to the child’s foot. Participants will be children whose heart rate and oxygen saturation levels need monitoring. Procedures include collecting demographic and medical information about the child and mother, applying 2 pulse oximeters to the child’s feet after delivery, and monitoring the child’s heart activity using an electrocardiogram.