I used this for about a month when my baby was a newborn. My baby started sleeping so well as soon as I put it on, so I bought another one to have a spare. I think I've only used this one about 5 times. It prevents the Moro reflex, so my baby doesn't wake up in surprise. This was an essential item for my child. I think you can use it all year round because you can adjust the room temperature! ● Size: Tagged S ● Condition: There is a small stain in the center of the second photo, I don't know where it came from. There is no problem with use, but please understand that this is a used item before purchasing. Please understand that this item is stored at home.