According to the Safety Organization Kids and Cars, an average of 38 children die each year from hot cars due to lack of attention from parents. Existing alert system uses sensors that detect child presence and care less about detecting temperature inside the car. In order to save children from heatstroke, our research focuses on providing information about the temperature inside the car using very effective sensors with high precision. In our research, we have tested different sensors and figured out three sensors that can provide precise information about the presence of a child without an adult. Our child detection system uses a weight sensor, PIR sensor, and temperature sensor. The weight sensor under the child and adult seat will determine the information about child presence without an adult, and also PIR sensor will be turned on to confirm one more time the presence of a child, and then the temperature sensor will read the information about the temperature inside the car. The main aim of our research is to develop a child detection prototype that will determine the presence of a child left alone inside a hot car with precise information. Our future work will focus on detecting the location of the child inside the car using a GPS module and sending alert messages to parents, caregivers, and emergencies.