The ornamental design for a babybeddingassembly, as shown and described.
FIG. 1 is a perspective view of a baby bedding assembly, showing my new design;
FIG. 2 is a top plan view;
FIG. 3 is a front elevational view; the rear being a mirror image thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 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, the football helmet, and the NFL logo form no part of the claimed design.