A child seat assembly for use in a shopping cart and secured to the hinged rear gate of the shopping cart that is configured for lifting to expose a rear opening for nesting like carts. The child seat is secured in a lower portion of the shopping cart basket by hinged connections such that the seat assembly is moveable between a use and a non-use configuration, and the hinged connection of the seat back is within a sliding track arrangement with the support strut such that the hinged connection of the seat bottom and seat back travels in an upward arcuate path as the seat assembly is moved from a use position to a non-use position. The rear gate having at least one lower leg opening and an upper void region between the basket top and the seat bottom. The seat bottom at least partially covering the leg opening and the seat back covering the upper void region when the seat is in the non-use configuration.