1. In combination with a crib having a mattress, a support for the mattress and frame means including a headboard, a footboard, a rear sideboard and a front sideboard, the headboard and the footboard having spaced uprights, and a cribliner tent of integral, transparent material including a bottom panel positioned under the mattress and side panels and end panels each integral with the bottom panel and fastened to the upper end portions of the boards, each side and end panel including a top flap folded back on the panel to form a sleeve portion extending around a top rail of the adjacent board, the tent including fastening means securing the corner portions of the top flaps to adjacent portions of the panels, the side panels including elongated side extensions woven into uprights of the headboard and the footboard and overlapping the end panels to form sealed corners.

2. A cribliner tent comprising an integral flat sheet of highly flexible transparent plastic material including: a flat, rectangular, horizontal bottom panel, a pair of flexible vertical end panels, and a pair of flexible vertical side panels, each of the panels extending upwardly from the bottom panel, each panel including fastening portions at the top end portion thereof, the side panels including side flaps adapted to overlap the end panels and be woven, over and under, uprights of a crib to form sealed corners and be retained in sealing positions by the uprights.