Abstract: A seat adapter for facilitating the use of playground equipment by infants. The seat adapter comprises: a back member; an infant holding portion attached to the back member at a lower location, a left side location and a right side location thereby defining openings for the infant's legs and torso; and upper fasteners and at least one of lower fasteners and mid-way fasteners for attaching the seat adapter to, and over, the piece of playground equipment. The seat adapter is particularly useful for use by young infants.