Abstract: The present invention provides a children's safety guard apparatus for installation into the frame of a window. A plurality of preferably square guard bars disposed in spaced relationship are connected to two support members, which are secured to the frame of a window. The bars are adjustable to a predetermined length, comprising two elongated members, one slidably mated inside the other. A means for locking the members so as to prevent them from sliding together is mounted to at least one bar of the plurality, the means being attached to the smaller member abutting the larger member. The means for locking includes a flexible sleeve portion surrounded by a flexible grip having flanges that can be drawn together or released via a bolt extending through bolt holes in the flanges, the bolt having a head provided with a keyway that fits a key.