Additional Study Information: During pregnancy, a baby's heart rate can tell us a lot about how their brain and body develop. Our team is testing a new, easy-to-use device that you can wear at home to track the baby's heartbeat for up to 24 hours. By using the monitor in your everyday environment, we can learn more about your baby's development in a natural setting, outside of the hospital or clinic. Study participation involves a brief meeting with our study team to learn how to use the device. Then, you will be asked to wear the device at home for up to 24 hours in your everyday environment. After 24 hours you will be able to simply return the study equipment to us via a prepaid mailer (provided to you at the initial meeting with the study team). You will receive $50 for your participation after returning the entire study equipment.