Applicants' invention comprises an apparatus and method to detect the presence of a child in a vehicle. Applicants' apparatus comprises a monitoring assembly comprising a pressure transducer, a first processor, and a monitoring transmitter. Applicants' apparatus further comprises a vehicle controller assembly comprising a second processor, a receiver, and a transceiver, wherein the receiver is capable of communicating with the monitoring transmitter. Applicants' apparatus further comprises a key fob comprising an RFID circuit, wherein Applicants' transceiver is capable of communicating with that RFID circuit.