The ornamental design for an infant or toddlerheadband, as shown and described.
FIG. 1 is a front, top and left-side perspective view of an infant or toddler headband embodying my new design, the dotted lines generally illustrating the head of an infant or toddler and forming no portion of the inventive design;
FIG. 2 is a front, top and left-side perspective view of the infant or toddler headband embodying my new design;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is right-side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The dotted line on the headband represents stitching.