In this study, a real-time infant monitoring system by using android-based mobile devices is developed and implemented in order to be used especially for hard of hearing parents. An Arduino Leonardo board has been used in the system design along with body temperature sensor, sound detection sensor, finger heartbeat detector, and humidity sensor. In order to notify alarm conditions to the parents, an android-based application has been developed. It is observed that the data collected from the sensors are monitored in real-time and the alarms are set off successfully when abnormal conditions occurred.