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A juvenile vehicle seat includes a seat base and a backrest. The backrest is mounted on the seat base and includes a seat back that is retained in an upright fixed seat-forming position relative to a seat bottom included in the seat base.

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The invention claimed is: 1. A juvenile vehicle seat comprising a seat base including a seat bottom, a first backrest support arranged to extend upwardly away from the seat bottom and formed to include a first-retainer pass-through slot, and a second backrest support arranged to lie in spaced-apart

The invention claimed is: 1. A juvenile vehicle seat comprising a seat base including a seat bottom, a first backrest support arranged to extend upwardly away from the seat bottom and formed to include a first-retainer pass-through slot, and a second backrest support arranged to lie in spaced-apart relation to the first backrest support to extend upwardly from the seat bottom and formed to include a second-retainer pass-through slot, and a backrest including a seat back positionable between the slots, a first keeper coupled to the seat back and configured to extend through the first-retainer pass-through slot formed in the first backrest support, and a second keeper coupled to the seat back and configured to extend through the second-retainer pass-through slot, the first keeper including a first back retainer associated with the first-retainer pass-through slot, the second keeper including a second back retainer associated with the second-retainer pass-through slot, the first and second back retainers being positioned for linear and pivotal movement relative to the seat base between a mated position mating with a portion of the seat base to block removal of the first keeper from the first-retainer pass-through slot and to block removal of the second keeper from the second-retainer pass-through slot so as to block separation of the backrest from the seat base and an unmated position unmating from the portion of the seat base to allow removal of the first keeper from the first-retainer pass-through slot and removal of the second keeper from the second-retainer pass-through slot so as to permit separation of the backrest from the seat base. 2. The seat of claim 1, wherein the first backrest support includes an upright side wall formed to include the first-retainer pass-through slot, and the upright side wall includes a first surface arranged to face toward the second backrest support and an opposite second surface arranged to face away from the second backrest support and configured to define the portion of the seat base mated with the first back retainer upon movement of the first keeper to the mated position. 3. The seat of claim 2, further comprising a first armrest coupled to the first backrest support to form a chamber therebetween containing the first back retainer. 4. The seat of claim 3, wherein the first armrest includes an arm support and an arm cantilevered to the arm support and the arm support is coupled to the first backrest support to define the chamber therebetween. 5. The seat of claim 3, wherein the first armrest includes an arm support arranged to lie in spaced-apart relation to the second backrest support to locate the first backrest support therebetween and an arm cantilevered to the arm support and the arm support is coupled to the first backrest support to define the chamber therebetween. 6. The seat of claim 3, wherein the first armrest includes an arm support mounted on the first backrest support for rotation about an axis extending through the first backrest support, an arm cantilevered to the arm support to rotate therewith about the axis, and an axle coupled to the upright side wall of the first backrest support and to the arm support and arranged to extend along the axis. 7. The seat of claim 2, wherein the upright side wall includes an interior edge defining the first-retainer pass-through slot and having, in series, a first straight segment, a lower semicircular segment coupled to the first straight segment, a second straight segment coupled to the lower semicircular segment and arranged to lie in spaced-apart relation to the first straight segment to define therebetween a width of the first-retainer pass-through slot, and an upper semicircular segment arranged to interconnect the second and first straight segments. 8. The seat of claim 7, wherein the first back retainer has an oblong shape, a length that is greater than the width of the first-retainer pass-through slot to block free movement of the first back retainer through the first-retainer pass-through slot upon movement of the seat back relative to the seat base to locate the first keeper in the mated position, and a width that is less than the width of the first-retainer pass-through slot to allow free movement of the first back retainer through the first-retainer pass-through slot upon movement of the seat back relative to the seat base to locate the first keeper in the unmated position. 9. The seat of claim 8, wherein the first keeper further includes a retainer support rod configured to interconnect the seat back and the first back retainer and arranged to extend through and lie in the first-retainer pass-through slot upon movement of the first keeper to the mated position. 10. The seat of claim 9, wherein the retainer support rod has a cylindrical shape and a curved exterior surface that is conformed to mate with the lower semicircular segment upon movement of the retainer support rod to a lowest position in the first-retainer pass-through slot located a first distance above the seat bottom and to mate with the upper semicircular segment upon movement of the retainer support rod to a highest position in the first-retainer pass-through slot located a greater second distance above the seat bottom. 11. The seat of claim 1, wherein the first keeper is arranged to project outwardly from a first side edge of the seat back in a first direction to extend through the first-retainer pass-through slot and the second keeper is arranged to project outwardly from a second side edge of the seat back in a second direction opposite to the first direction to extend through the second-retainer pass-through slot. 12. The seat of claim 11, wherein the first back retainer has an oblong shape and is configured to lie in a vertical orientation relative to the seat bottom during an initial stage of mounting the backrest on the seat base upon movement of the first keeper to the unmated position and to lie in a horizontal orientation relative to the seat bottom during a second backrest-mounting stage mounting the backrest on the seat base upon movement of the first keeper to the mated position. 13. The seat of claim 12, wherein the first keeper further includes a first retainer support rod configured to interconnect the first side edge of the seat back and the first back retainer and extend through the first-retainer pass-through slot, the second keeper further includes a second retainer support rod configured to interconnect the second side edge of the seat back and the second back retainer and extend through the second-retainer pass-through slot, and the first and second retainer support rods are arranged to rotate about an axis extending through the first-and second-retainer pass-through slots as the first back retainer moves between the vertical and horizontal orientations without restricting up-and-down movement of the first and second retainer support rods in the first-and second-retainer pass-through slots during movement of the first keeper between the unmated and mated positions. 14. The seat of claim 12, wherein the first backrest support includes an interior edge defining the first-retainer pass-through slot and having a first straight segment and a second straight segment arranged to lie in spaced-apart relation to the first straight segment to define therebetween a width of the first-retainer pass-through slot and wherein the first back retainer has a length that is greater than the width of the first-retainer pass-through slot to block free movement of the first back retainer through the first-retainer pass-through slot upon movement of the seat back relative to the seat base to locate the first keeper in the mated position, and a width that is less than the width of the first-retainer pass-through slot to allow free movement of the first back retainer through the first-retainer pass-through slot upon movement of the seat back relative to the seat base to locate the first keeper in the unmated position. 15. The seat of claim 11, further comprising a first armrest coupled to the first backrest support to form a chamber therebetween containing the first back retainer. 16. The seat of claim 15, wherein the first armrest includes an arm support and an arm cantilevered to the arm support and the arm support is coupled to the first backrest support to define the chamber therebetween. 17. The seat of claim 1, wherein the seat base is further formed to include a first socket located in a fixed position relative to the seat bottom, and the first socket is formed to include a post-receiving channel and a socket wall bordering the post-receiving channel and providing a bottom edge defining a retainer flange, the backrest further includes a first post coupled to the seat back and arranged to extend into the post-receiving channel formed in the first socket to orient the seat back in an upright fixed seat-forming position relative to the seat bottom, and further comprising a first anchor configured to anchor the first post in the post-receiving channel formed in the first socket to retain the seat back in the upright fixed seat-forming position. 18. The seat of claim 17, wherein the first socket is located midway between the first and second backrest supports, the seat base is further formed to include a second socket located in a fixed position relative to the seat bottom adjacent to the first backrest support and between the first socket and the first backrest support and a third socket located in a fixed position relative to the seat bottom adjacent to the second backrest support, the backrest further includes a second post coupled to the seat back and arranged to extend into a post-receiving channel formed in the second socket and a third post coupled to the seat back to locate the first post between the second and third posts and arranged to extend into a post-receiving channel formed in the third socket, and further comprising a second anchor configured to anchor the second post in the post-receiving channel in the second socket and a third anchor configured to anchor the third post in the post-receiving channel in the third socket. 19. The seat of claim 18, wherein the first backrest support includes an upright side wall formed to include the first-retainer pass-through slot and arranged to define a boundary of the post-receiving channel formed in the second socket. 20. The seat of claim 19, wherein the upright side wall includes a first surface arranged to face toward the second backrest support and define the boundary of the post-receiving channel formed in the second socket and the upright side wall further includes an opposite second surface arranged to face away from the second backrest support and configured to define the portion of the seat base mounted with the first back retainer upon movement of the first keeper to the mated position. 21. The seat of claim 17, wherein the first anchor includes a retainer coupled to the first post and arranged to mate with the retainer flange in a position under the socket wall bordering the post-receiving channel to block removal of the first post from the post-receiving channel formed in the first socket without blocking insertion of the first post into the post-receiving channel. 22. The seat of claim 21, wherein the seat back further includes a downwardly facing wall extending outwardly from the first post and the seat base further includes an upwardly facing surface arranged to mate with the downwardly facing wall extending outwardly from the first post upon movement of the first post in the post-receiving channel formed in the first socket to cause the retainer coupled to the first post to mate with the retainer flange included in the first socket. 23. The seat of claim 22, wherein the seat back includes a front surface facing toward a front edge of the seat bottom and the downwardly facing wall included in the seat back extends between the first post and the front surface of the seat back. 24. The seat of claim 21, wherein the first socket includes a top wall having a top perimeter edge defining a top aperture opening into the post-receiving channel and receiving the first post therein during insertion of the first post into the post-receiving channel, the bottom edge defines a bottom aperture opening into the post-receiving channel and is arranged to lie in spaced-apart relation to the top perimeter edge, and the seat back further includes a downwardly facing wall arranged to mate with the top wall of the first socket upon movement of the first post in the post-receiving channel formed in the first socket to cause the retainer coupled to the first post to mate with the retainer flange included in the first socket. 25. The seat of claim 1, wherein the first backrest support includes an interior edge defining the first-retainer pass-through slot and having, in series, a first straight segment, a lower end segment coupled to the first straight segment, a second straight segment coupled to the lower end segment and arranged to lie in spaced-apart relation to the first segment to define therebetween a width of the first-retainer pass-through slot, and an upper end segment arranged to interconnect the second and first straight segments and locate the lower end segment between the seat base and the upper end segment, the seat base is further formed to include a first socket formed to include a post-receiving channel, the backrest further includes a first post coupled to the seat back and arranged to lie substantially outside the post-receiving channel formed in the first socket upon movement of the seat back to a raised position relative to the seat bottom wherein the first keeper is located in a highest position in the first-retainer pass-through slot adjacent to the upper end segment and wherein the first post is arranged to extend into the post-receiving channel formed in the first socket upon movement of the seat back to a lowered position relative to the seat bottom wherein the first keeper is located in a lowest position in the first-retainer pass-through slot adjacent to the lower end segment. 26. The seat of claim 25, further comprising a first anchor configured to anchor the first post in the post-receiving channel formed in the first socket upon movement of the seat back to the lowered position. 27. The seat of claim 26, wherein the first socket is located midway between the first and second backrest supports, the seat base is further formed to include a second socket located adjacent to the first backrest support and between the first socket and the first backrest support and a third socket located adjacent to the second backrest support, the backrest further includes a second post coupled to the seat back and arranged to extend into a post-receiving channel formed in the second socket and a third post coupled to the seat back to locate the first post between the second and third posts and arranged to extend into a post-receiving channel formed in the third socket, and further comprising a second anchor configured to anchor the second post in the post-receiving channel in the second socket upon movement of the seat back to the lowered position and a third anchor configured to anchor the third post in the post-receiving channel in the third socket upon movement of the seat back to the lowered position. 28. A juvenile vehicle seat comprising a backrest including a seat back and a keeper coupled to the seat back and a seat base including first and second backrest supports arranged to lie in spaced-apart relation to one another to locate the seat back therebetween, and wherein the first backrest support includes an interior edge arranged to define an oblong pass-through slot, the keeper includes a retainer support rod coupled to the seat back and arranged to extend through the oblong pass-through slot and a back retainer coupled to the retainer support rod, the back retainer is arranged to mate with a portion of the first backrest support to block removal of the retainer support rod from the oblong pass-through slot upon linear and pivotal movement of the backrest to a vertical mated position relative to the seat base so as to block separation of the backrest from the seat base and to unmate from the portion of the first backrest support to allow removal of the retainer support rod from the oblong pass-through slot upon movement of the backrest to a horizontal unmated position relative to the seat base so as to permit separation of the backrest from the seat base. 29. The seat of claim 28, wherein the first backrest support includes an upright side wall formed to include the oblong pass-through slot, and the upright side wall includes a first surface arranged to face toward the second backrest support and an opposite second surface arranged to face away from the second backrest support and configured to define the portion of the seat base mated with the back retainer upon movement of the backrest to the mated position. 30. The seat of claim 29, further comprising a first armrest coupled to the first backrest support to form a chamber therebetween containing the back retainer. 31. The seat of claim 30, wherein the first armrest includes an arm support arranged to lie in spaced-apart relation to the second backrest support to locate the first backrest support therebetween and an arm cantilevered to the arm support and the aim support is coupled to the first backrest support to define the chamber therebetween. 32. The seat of claim 29, wherein the upright side wall includes an interior edge defining the oblong pass-through slot and having, in series, a first straight segment, a lower semicircular segment coupled to the first straight segment, a second straight segment coupled to the lower semicircular segment and arranged to lie in spaced-apart relation to the first straight segment to define therebetween a width of the oblong pass-through slot, and an upper semicircular segment arranged to interconnect the second and first straight segments. 33. The seat of claim 32, wherein the back retainer has an oblong shape, a length that is greater than the width of the oblong pass-through slot to block free movement of the back retainer through the oblong pass-through slot upon movement of the seat back relative to the seat base to the first position, and a width that is less than the width of the oblong pass-through slot to allow free movement of the back retainer through the oblong pass-through slot upon movement of the seat back relative to the seat base to the unmated position. 34. The seat of claim 32, wherein the retainer support rod has a cylindrical shape and a curved exterior surface that is conformed to mate with the lower semicircular segment upon movement of the retainer support rod to a lowest position in the oblong pass-through slot located a first distance above the seat bottom and to mate with the upper semicircular segment upon movement of the retainer support rod to a highest position in the oblong pass-through slot located a greater distance above the seat bottom. 35. The seat of claim 28, wherein the keeper is arranged to project outwardly from a first side edge of the seat back in a first direction to extend through the oblong pass-through slot. 36. The seat of claim 35, wherein the back retainer has an oblong shape and is configured to lie in a vertical orientation relative to the seat bottom during an initial stage of mounting the backrest on the seat base upon movement of the backrest to the second position and to lie in a horizontal orientation relative to the seat bottom during a second backrest-mounting stage mounting the backrest on the seat base upon movement of the backrest to the mated position. 37. The seat of claim 36, wherein a retainer support rod is configured to interconnect the first side edge of the seat back and the back retainer, and the first retainer support rod is arranged to rotate about an axis extending through the oblong pass-through slot as the back retainer moves between the vertical and horizontal orientations without restricting up-and-down movement of the first retainer support rod in the oblong pass-through slot during movement of the backrest between the mated and unmated positions. 38. The seat of claim 28, wherein the seat base is further formed to include a first socket located in a fixed position relative to the seat bottom, and the first socket is formed to include a post-receiving channel and a socket wall bordering the post-receiving channel and providing a bottom edge defining a retainer flange, the backrest further includes a first post coupled to the seat back and arranged to extend into the post-receiving channel formed in the first socket to orient the seat back in an upright fixed seat-forming position relative to the seat bottom, and further comprising a first anchor configured to anchor the first post in the post-receiving channel formed in the first socket to retain the seat back in the upright fixed seat-forming position. 39. The seat of claim 38, wherein the first anchor includes a retainer coupled to the first post and arranged to mate with the retainer flange in a position under the socket wall bordering the post-receiving channel to block removal of the first post from the post-receiving channel formed in the first socket without blocking insertion of the first post into the post-receiving channel. 40. The seat of claim 38, wherein the first socket is located midway between the first and second backrest supports, the seat base is further formed to include a second socket located in a fixed position relative to the seat bottom adjacent to the first backrest support and between the first socket and the first backrest support and a third socket located in a fixed position relative to the seat bottom adjacent to the second backrest support, the backrest further includes a second post coupled to the seat back and arranged to extend into a post-receiving channel formed in the second socket and a third post coupled to the seat back to locate the first post between the second and third posts and arranged to extend into a post-receiving channel formed in the third socket, and further comprising a second anchor configured to anchor the second post in the post-receiving channel in the second socket and a third anchor configured to anchor the third post in the post-receiving channel in the third socket.