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In this paper, we presented an infant monitoring system using CO2 sensors to non-invasively monitor the exhaled air from an infant in order to reduce the potential risks for Sudden Infant Death Syndrome (SIDS). Due to the variation in the exhaled CO2 concentration, we can detect problematic episodes associated with infant's respiration. An array of CO2 sensors is mounted around the infant in the bars of the crib and they are wire-connected to a circuit board located at the end of the crib. This board consists of a processing circuit and a wireless transmission module transmitting signals to a compact receiver at the caregivers' location. We have designed and assembled the modules in printed circuit boards (PCBs) with commercial metal-oxide based CO2 sensors. The sensor has been tested in sensitivity, selectivity and humidity dependence. The module has been tested with its transmission capability in various environments. The entire infant monitoring system has been tested showing desired functionality.