In this scientific research, an innovative sensor system is developed to prevent child heatstrokes in vehicles. The system incorporates a 24 GHz Continuous-Wave (CW) radar system, which identifies vital signs of an infant through a 4-by-1 patch antenna array embedded in a specifically designed circuit board. Intelligent signal processing algorithms analyze data generated by the radar chip and execute processing tasks on a robust microcontroller. The child’s respiration rate can be extracted qualitatively from the data in nearly real-time, enabling the system to differentiate between a child and a mere shopping bag on the seat. In the event of identifying a critical condition, the system transmits this information via a data bus to a central ECU within the vehicle. This ECU is integrated with GSM and GPS connections, allowing communication with the driver or emergency services. The development of the sensor system adheres to existing automotive industry standards, featuring a cost-effective design intended as a prototype for large-scale production. Through rigorous evaluation across various scenarios, including realworld situations with children, the sensor system is refined. The continuously reliable function of the developed radar-based sensor system holds the potential to save children’s lives, making a major contribution to automotive safety.