A child seat assembly has a base to rest on a vehicle seat, a seat shell, and a recline mechanism that selectively permits adjustment of the seat shell between first and second recline positions and includes a recline positioner, pin, biasing element, and handle. The recline positioner has first and second portions defining the first and second recline positions, respectively. The pin is movable between a released position and an engaged position in which the pin is configured to engage the first or second portion to retain the seat shell in the corresponding first or second recline position. The biasing element is coupled to the pin and configured to bias the pin to the engaged position. The handle is operable to move the pin from the engaged position to the released position in which the seat shell is movable between the first and second recline positions.