It seems comfortable because the back becomes a C-curve, and the whole body is wrapped in a cushion. I was very grateful that the baby started sleeping for longer periods. Usable from newborns. If you are preparing before childbirth, or if your baby wakes up easily, please consider this. The laundry detergent used is additive-free and unscented, for babies. Also, this is a used item, and it has been used by a child, so please forgive any small stains that may have been overlooked. I will check it before shipping and pack it in a box. Please purchase only if you understand. I used it a few times until the baby started sleeping on their side, but I had a towel underneath, so there are no noticeable stains. I'm giving it away to someone who can use it since it's no longer usable after the baby started sleeping on their side. The back switch disappeared, which was a great help. Also, the baby slept well during the day. The following is quoted from the website: 【Size】W110cm x D70cm x H15cm 【Material】 Outer fabric: Stretch knit / 100% polyester Covering: Pile / 82% cotton, 18% polyester Filling: Crea beads (expanded polystyrene) ■ The cover can be washed. Wash in a laundry net on a delicate cycle, shape it, and dry it in a well-ventilated place in the shade. ■ You can adjust the beads to your preferred height by adding or removing them. ■ When refilling, please be careful to prevent your child from swallowing the beads. ■ The main body cannot be washed. If it gets dirty, wipe it with a cloth soaked in a mild detergent, and then wipe it thoroughly with a dry cloth. C-curve egg cushion breathable pad Back switch, good night, egg, nap, sofa, baby, pile, bead cushion, cushion Bed, newborn, midwifery clinic, Hanaroro, made in Japan, made in Japan, free shipping