I bought this because I was worried about my baby sleeping on their stomach, but they were already rolling over, so they cried immediately after I put it on and I never used it. *I have washed it with baby detergent. There is a faint black stain on the ◯ mark. Please refrain from purchasing if you are concerned. I recommend using it from an early age. Original price: 7,280 yen 【 Stops Rolling Over! 】Mughart has created a sheet that stops babies and children from rolling over while they sleep. 【 Easy to Put On and Take Off with Just a Zipper 】 Once you attach the main unit, you can easily put it on and take it off with just a zipper. We listened to mothers who said, "The velcro sound wakes up the baby when attaching or removing it..." 【 Can be used on both beds and futons 】 Can be used with baby mats with a circumference of 170cm or less, or firm cotton baby futons. Also, because it uses thick cotton, it is less likely to lose its shape. *Exclusively for baby mattresses and firm cotton baby futons. Never use it with other futons. 【 Easy-to-understand illustrated instructions 】 Comes with color illustrated instructions. 【 Product Contents 】 Main unit (swaddling sheet x1, swaddling belt x1, instruction manual), 【Target】 Newborns ~ around 9 months old 【Material】 Cotton 【Target Age】 ~ up to around 9 months old