The ornamental design for a child's rocking toy, as shown and described.
FIG. 1 is a perspective view of a child's rocking toy showing my new design
therefor. The broken line drawings representing children are for purposes
of illustration only and form no part of my design;
FIG. 2 is a top plan view;
FIG. 3 is one side elevational view, all side elevational views being the
same; and,