I purchased this from the Konny official website and used it twice. I think it's the perfect size for newborns, up to around 3500g. My baby would settle down and sleep well when swaddled in it. My friend's baby also slept well in it. My baby was unusually large, so I quickly switched to a larger swaddle. Green check cotton baby sleep sack, with a storage bag. - Color: Green check - Accessories: Storage bag - Brand: Konny - Material: 100% cotton Thank you for looking. The usable period is short, but it's a helpful item and I recommend it.