A device is provided for use below a child's seat to collect solid and liquid items dropped by a child in the seat when in use, where the device forms a pad or platform with a top layer of substantially fluid-resistant material, a border rim configured as a raised surface around a portion of the periphery of the pad to provide a barrier against the runoff of any collected fluids or the roll off of any collected items, and where the device also includes a connector for securing a cantilevered portion of the platform to a structure in front of the child's seat.