1. A system for classifying an object occupying a vehicle seat comprising: a seat having a seat back and a seat base; a signal-generating classification thermal sensor fitted to said seat back; a signal-generating classification thermal sensor fitted to said seat base; a signal-generating reference sensor; and a controller to which said sensors are operatively associated, wherein said controller classifies the object occupying the vehicle seat as an adult when said thermal sensors identify that there is an increase in temperature in both the seat back and the seat base, a child in a booster seat when said thermal sensors identify that there is an increase in temperature in the seat back alone, or a child in a child restraint system when said thermal sensors identify that there is no increase in temperature in neither the seat back nor the seat base.