Abstract: An adult to infant convertible seat is described for automobiles and other moving vehicles which have a storage compartment behind the convertible seat. The infant seat is retractable into the storage compartment and extendible into the infant seat use position. The infant or child seat is provided with an upper back rest portion and lower seat portion which are selectively connected and locked to each other to permit unfolding of the seat when a child seat is to be used in a folded condition which substantially reduces the clearance radius of the seat thereby permitting the movement of the child seat in the folded condition into smaller storage compartments and areas of smaller dimensions.