Abstract: An infant/child seat and frame combination is disclosed wherein the seat is mountable and de-mountable to and from the frame by a combination of seat back hooks and seat bottom positioning elements engageable with compatibly configured frame members on the frame. Various frame configurations may be constructed to accept the seat, e.g., a car seat frame, a stroller frame, a high chair frame, or a wheelchair frame, so that the same seat may be moved from one frame to another to serve varying purposes.