I used this from when my newborn was born until they were about a month old, when they slept at night. They started to dislike putting their arms through it, and were able to sleep without the swaddle, so I'm selling it. There may be some yellowing around the neck, but since the usage period is limited, I hope you will consider it ^ ^ Below is a description automatically created by Mercari, which I will leave as is. - Brand: Love to Dream - Product name: Swaddle Up Bamboo Lite - Size: S (3-6 kg) - Material: Bamboo - TOG: 0.2 - Design: Star pattern - Color: White/Gray