A child detection system for a child seat includes a pressure sensor is adapted for detecting when weight is positioned on the presser sensor. The pressure sensor is selectively positioned within a seat cushion of a restraining seat. A primary processor is electrically coupled to the pressure sensor. The primary processor is adapted for is electrically coupled to a vehicle computer system of a vehicle in which is positioned the restraining seat. A sound emitter for emitting an audible sound is operationally coupled to the primary processor. The primary processor turns on the sound emitter for at least 3 seconds when the pressure sensor senses a weight thereon and the vehicle computer system determines that a driver's side door of the vehicle is open.