The ornamental design for a juvenileseat for bathtub, as shown and described.
FIG. 1 is a first perspective view of a juvenile seat for a bathtub in accordance with our new design;
FIG. 2 is a front elevational view of the juvenile 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, with portions of the juvenile seat being illustrated in broken lines, which broken lines are for illustrative purposes only and form no part of the juvenile seat;
FIG. 7 is a bottom view thereof, with portions of the juvenile seat being illustrated in broken lines, which broken lines are for illustrative purposes only and form no part of the juvenile seat; and,
FIG. 8 is a second perspective view of a juvenile seat of FIG. 1.