Rowen Valley Linden Beds are slightly wider than a standard mattress, and some customers have mentioned a noticeable gap between the frame and box springs. This is an industry standard; it makes it easier to make the bed and allows room for the sheets, blankets and comforter. When a standard mattress is centered, there should be a 1" gap on either side. The Little Seeds Rowan Valley Linden Full Size Bed meets or exceeds the CPSIA Juvenile testing requirements to ensure your child's safety.