I claim the ornamental design for an infant cap, as shown and described.
FIG. 1 is a perspective view of an infant cap, showing my new design in use;
FIG. 2 is a perspective view thereof, illustrated in a flat configuration;
FIG. 3 is a bottom plan view of FIG. 2;
FIG. 4 is a top plan view of FIG. 2;
FIG. 5 is a right-side elevational view of FIG. 2;
FIG. 6 is a left-side elevational view of FIG. 2;
FIG. 7 is a front elevational view of FIG. 2; and,
FIG. 8 is a rear elevational view of FIG. 2.
The broken lines showing an infant in FIG. 1 depict environmental matter and form no part of the claimed design. The grid-like shading on the design represents a woven fabric texture.