The ornamental design for a babybeddingassembly, as shown and described.
FIG. 1 is a top plan view of a baby bedding assembly, showing my new design;
FIG. 2 is a front elevational view; the rear being a mirror image thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a left side elevational view, the right being a mirror image thereof.
The broken lines are for environmental purposes only and form no part of the claimed design. The crib and basketballs form no part of the claimed design.