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An easy-to-build and low-cost infant heartbeat monitor is described. The battery-powered portable monitor provides both visual and audible indications of each heartbeat by sensing the ECG signal. Heart-rate indication and alarm limits are not provided.The monitor is constructed from readily available parts and uses standard batteries for its operation. It is designed using reliable and low-powered solid-state devices, is simple to operate and service, and is electrically safe. It can be made quite compact and durable and its application is not solely limited to infant monitoring.