Abstract: A covering for children's seating devices such as car seats, strollers, swings, infant carriers or the like includes a main body portion forming a pocket that fits over a seating device, and at least one blanket flap portion provided inset from a side of the main body portion. The blanket flap portion is foldably coupled to the main body portion to cover a child seated in the seating device when inwardly folded. Once the covering has been fastened to the seating device, a child is placed thereon so that the rear of the child comes into contact with the main body portion, which covers the seating device. Harness straps of the seating device, which serve to secure the child within the seating device, can be engaged through a divided opening through the main body portion prior to fitting it over the seat. The blanket flap portion is then folded over the body of the child so as to insulate the child in the manner of a blanket.