A child seat configured to be secured to a car seat, the child seat comprising: a seat base defining a seat portion and a backrest portion, wherein the seat base is configured to receive an untensioned belt of the car seat to secure the child seat to the car seat in an untensioned configuration, wherein the belt defines a lap section and a shoulder section, wherein the seat base further defines a first arm rest and a second arm rest, wherein a top surface of each arm rest (22, 23) extends in a first horizontal plane; and a tensioning mechanism attached to the backrest portion of the seat base, wherein the tensioning mechanism is rotatable between a first position substantially adjacent to the backrest portion of the seat base and a second position disposed therefrom, wherein, in the second position, the tensioning mechanism is configured to receive a portion of the lap section of the belt and a portion of the shoulder section of the belt, wherein, in the second position, a bottom surface of the tensioning mechanism extends in a second horizontal plane, wherein the second horizontal plane is above the first horizontal plane such that the top surface of each arm rest (22, 23) and the bottom surface of the tensioning mechanism define a belt guide channel configured to allow a user to position the portion of the lap section and the portion of the shoulder section of the belt therebetween, and wherein, in the first position, the tensioning mechanism is configured to displace the portion of the lap section and the portion of the shoulder section out of a third horizontal plane to apply tension to the portion of the lap section and the portion of the shoulder section of the belt to secure the child seat to the car seat in a tensioned configuration. a seat base defining a seat portion and a backrest portion, wherein the seat base is configured to receive an untensioned belt of the car seat to secure the child seat to the car seat in an untensioned configuration, wherein the belt defines a lap section and a shoulder section, wherein the seat base further defines a first arm rest and a second arm rest, wherein a top surface of each arm rest (22, 23) extends in a first horizontal plane; and a tensioning mechanism attached to the backrest portion of the seat base, wherein the tensioning mechanism is rotatable between a first position substantially adjacent to the backrest portion of the seat base and a second position disposed therefrom, wherein, in the second position, the tensioning mechanism is configured to receive a portion of the lap section of the belt and a portion of the shoulder section of the belt, wherein, in the second position, a bottom surface of the tensioning mechanism extends in a second horizontal plane, wherein the second horizontal plane is above the first horizontal plane such that the top surface of each arm rest (22, 23) and the bottom surface of the tensioning mechanism define a belt guide channel configured to allow a user to position the portion of the lap section and the portion of the shoulder section of the belt therebetween, and wherein, in the first position, the tensioning mechanism is configured to displace the portion of the lap section and the portion of the shoulder section out of a third horizontal plane to apply tension to the portion of the lap section and the portion of the shoulder section of the belt to secure the child seat to the car seat in a tensioned configuration.