Abstract: The low blood oxygen level warning system generally includes a sensor for measuring a plurality of oxygen saturation levels in, e.g., an infant. A communication circuit transmits a signal associated with at least one of the plurality of oxygen saturation levels measured by the sensor to a remote device. A controller compares at least one of the plurality of oxygen saturation levels measured by the sensor to a predetermined threshold oxygen saturation level. The remote device provides an alarm in response to an undesired oxygen saturation level of which is relatively lower than the predetermined threshold oxygen saturation level.