I claim the ornamental design for a burp cloth, as shown and described.
FIG. 1 is a perspective view of the burp cloth, showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a front side view thereof;
FIG. 7 is a rear side view thereof; and,
FIG. 8 is a perspective view showing the burp cloth with environmental features.
Broken lines, such as those depicted in FIG. 8, are for environmental purposes only to show an exemplary use-scenario and form no part of the claimed design. The dot pattern is used to illustrate a fabric material.