This is a great item because it can be fastened on both sides with snap closures. You can lay one sheet down, place the baby on it, then cover them with the other sheet and quickly fasten the sides. The soft, gentle feel of the gauze fabric makes it useful not only as a sleep sack but also after bath time. It's easy to use because there's no need to put sleeves on or pull it over the head. I thought it was cute and convenient, and I used it with care, but in the end, I didn't use it much. I think it can be used from newborns to around 3 years old. Because I washed it frequently despite the low frequency of use, there is some overall pilling, and I've noted that it has some minor scratches and stains. I hope to sell it, understanding that it is a used item.