Portable Folding Crib

FIG. 1 is a front perspective view of a portable folding crib showing my new design; FIG. 2 is a rear perspective view thereof; 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 a right side elevational view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is a front perspective view thereof in another state; FIG. 10 is a perspective view thereof in a folded state; FIG. 11 is a perspective view thereof in a half-folded state; and, FIG. 12 is a partial enlarged view taken from circle 12 in FIG. 9 . The dash-dash broken lines in the drawings depict the portions of the portable folding crib that form no part of the claimed design. The dot-dash broken lines in the drawings depict the boundaries of the partial enlarged views that form no part of the claimed design.