The ornamental design for a juvenilevehicleseat, as shown and described.
FIG. 1 is a perspective view, taken from the front, right side, of a juvenile vehicle seat in accordance with a first embodiment of our new design;
FIG. 2 is a front elevation view of the juvenile vehicle seat shown in FIG. 1;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line showing of portions of the juvenile vehicle seat in FIGS. 3 and 6 is included for the purpose of illustrating environmental structure and forms no part of the claimed design.