An infant carrier holder and a shopping cart with a handle and a gate, the infant carrier holder being mounted to the shopping cart for supporting a motor vehicle infant carrier on the shopping cart, the infant carrier holder comprising: a floor element for supporting the infant carrier; a plurality of sidewalls connected to the floor element for limiting lateral movement of the infant carrier; brackets located on at least one surface of the infant carrier holder and configured to be coupled to the gate of the shopping cart to mount the infant carrier holder to the shopping cart; the floor element of the carrier holder having a first end proximal to the gate and a second end distal from the first end, wherein the second end of the floor element is higher than the first end and wherein the second end is opposite to the first end and at a height above the handle of the shopping cart, such that the second end can rest on and move atop of a handle of another shopping cart into which the shopping cart is nested, wherein the infant carrier holder has opposing sidewalls, the floor element and a rear wall and a front edge, wherein the sidewalls and rear wall are connected together to form a concave shape in conjunction with the floor element, wherein the front edge is securely fastened to the gate, characterized in that the opposing sidewalls, the rear wall and the front edge extend upward from the floor element, wherein the front edge has a generally planar shape, so that a relatively large area of the front edge contacts the gate, wherein the front edge includes through openings for accepting the brackets to secure the infant carrier holder to the gate of the shopping cart, and wherein the infant carrier when placed in the infant carrier holder is urged by the concave shape to slide downward toward the front edge. a floor element for supporting the infant carrier; a plurality of sidewalls connected to the floor element for limiting lateral movement of the infant carrier; brackets located on at least one surface of the infant carrier holder and configured to be coupled to the gate of the shopping cart to mount the infant carrier holder to the shopping cart; the floor element of the carrier holder having a first end proximal to the gate and a second end distal from the first end, wherein the second end of the floor element is higher than the first end and wherein the second end is opposite to the first end and at a height above the handle of the shopping cart, such that the second end can rest on and move atop of a handle of another shopping cart into which the shopping cart is nested, wherein the infant carrier holder has opposing sidewalls, the floor element and a rear wall and a front edge, wherein the sidewalls and rear wall are connected together to form a concave shape in conjunction with the floor element, wherein the front edge is securely fastened to the gate, characterized in that the opposing sidewalls, the rear wall and the front edge extend upward from the floor element, wherein the front edge has a generally planar shape, so that a relatively large area of the front edge contacts the gate, wherein the front edge includes through openings for accepting the brackets to secure the infant carrier holder to the gate of the shopping cart, and wherein the infant carrier when placed in the infant carrier holder is urged by the concave shape to slide downward toward the front edge.