FIG. 1 is a perspective view of a baby play mattress, showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a plan view thereof;
FIG. 4 is a side elevational view thereof, from the side opposite that shown in FIG. 2;
FIG. 5 is an end elevational view thereof;
FIG. 6 is a end elevational view thereof, from the end opposite that shown in FIG. 5; and,
FIG. 7 is bottom view thereof.
The broken lines are for environmental purposes only and form no part of the claimed design.