This disclosure provides designs for inexpensive devices that can be sturdy, pleasing to the eye, light in weight, and attractively padded, to form an enclosure around an infant or neonate that is open at its bottom. These devices protect neonates from injury during bed-sharing or co-sleeping with other individuals. These enclosures include roll-over bars to protect infants and neonates from being injured or asphyxiated by weight of a co-sleeper inadvertently moving on top of a roll-over bar. Devices can be shaped to allow for easy placement and removal of the infant, or to place the enclosure with the respective roll-over bar(s) over an infant. Roll-over bar(s) can be hinged or intercalated with pivots to deflect frame base portions when an infant body part finds itself accidentally caught under them. The rotation can be limited to an angle that still allows for the roll-over bar to be above an infant's body when frame base portion(s) are raised above the sleeping surface by the pressure and forces exerted on a roll-over bar when a co-sleeper inadvertently moves over a roll-over bar.