These are baby mittens from Nakagawa Masashichi Shoten. From the official website: ↓ These mittens are for preventing babies from scratching themselves. They are made with organic cotton that is excellent at absorbing and releasing moisture, and are knitted in a piqué stitch. The piqué stitch is characterized by its textured surface, and is called "kanoko-ami" (deer child knit) because the pattern resembles the spots on a baby deer's back. The textured knit reduces the contact area with the skin, making it highly breathable and comfortable to use throughout the year.