Abstract: A vehicle backseat child detection system for preventing children from being left in vehicle back seats includes a control box having a timer. The control box is coupled within a dashboard of a vehicle and is in operational communication with a fuse panel and a horn of the vehicle. At least one seat pressure switch each detects the weight of a child and is in operational communication with the control box. If one seat pressure switch detects the presence of a child and the control box detects the vehicle is turned off, a warning light is activated and the timer runs for a preset duration of time before activating the horn of the vehicle unless the child is removed or the vehicle is turned on.