Frames should be made from soft, flexible and unbreakable materials and are just as important as the lenses. Rubber like materials are perfect as they dont break or feel uncomfortable, leaving pressure marks on the bridge or face. Also ideally for babies they should have a headband to hold them in place and nothing works better than an adjustable neoprene headband with a wide back for comfort. Note that the headband should be adjustable on one side for ease and comfort when the baby is lying down. One extra benefit of soft rubber frames with a headband is that they do contour to the shape of the babys head eliminating any gaps between the sunglass frame and the babys face preventing any UV light from entering the eyes. Remember babies have no chromophores to protect their eyes.