Seat primarily for a child
FIG. 1 is a front perspective view of a new and ornamental design for a seat primarily for a child; 
     FIG. 2 is a rear perspective view of the device shown in FIG. 1; 
     FIG. 3 is a top plan view of the device shown in FIG. 1; 
     FIG. 4 is a right side plan view of the device shown in FIG. 1; and, 
     FIG. 5 is a bottom plan view of the device shown in FIG. 1.