A shopping cart liner includes a body configured to nest in the child seat portion of a shopping cart. The body may define one or more openings positioned to enable the feet of a child seated in the shopping cart to protrude through the body, and the shopping cart liner includes a track at least partially embedded in a portion of the shopping cart liner. A clip is slidingly engaged with the track, and defines an opening for attaching an item to the shopping cart liner. An item such as a toy, teething ring, pacifier, or other item may be attached. The body may be padded, and, and may include one or more pockets. The shopping cart liner may include a seat belt for securing a child to the shopping cart liner, and may be used in combination with a pillow.