Adjuster and hinge for child booster seat

A child seat assembly for use on a vehicle seat, said child seat assembly comprising:

• a seat portion adapted to be supported on the vehicle seat, said seat portion including a cavity, a first recess having a hole, and a second recess having an upwardly facing slot;
• a base disposed at least partially within said cavity of said seat portion, said seat portion operatively coupled to said base for selective sliding movement of said seat portion in a longitudinal direction relative to said base;
• a backrest pivotally coupled to said seat portion, said backrest being releasably coupled to the seat portion and configured to pivot about an axis extending in a lateral direction through the seat portion in response to said sliding movement of relative to said base, said backrest including a first hinge arm having a first hinge pin extending in said lateral direction and a second hinge arm having a second hinge pin extending in said lateral direction opposite said first hinge pin, wherein said first hinge pin is pivotally disposed in said hole and said second hinge pin is pivotally disposed in said upwardly facing slot;
• and
• a flange flexibly coupled to said seat portion and engaging an enlarged head of said second hinge pin thereby retaining said second hinge pin in said upwardly facing slot, wherein said flange flexes outwardly to disengage with said enlarged head of said second hinge pin to release said second hinge pin from said upwardly facing slot.