There is provided a device (100) for placement on the abdomen (102) of a subject to measure uterine contractions of the subject and a fetal heart rate. The device (100) comprises a rigid base (104) for placement on the abdomen (102) of the subject and a cover (106) configured to connect to the rigid base (104). The cover (106) comprises a flexible portion moveable in response to uterine contractions of the subject. The device (100) further comprises a fetal heart rate sensor (108) mounted on the rigid base (104) and configured to measure the fetal heart rate. The device (100) also comprises a uterine contractions sensor (110) located within the device (100) and configured to measure the uterine contractions of the subject.