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, baseballs, and baseball bats form no part of the claimed design.