This is a set of 16 short-sleeved undershirts, sold as a bundle. The size is approximately 50-60. They can be used as newborn underwear. As it gets colder, they can be worn under rompers. For those who experience spit-up, urine leaks, or want to change undershirts frequently due to sweat, having many undershirts is convenient. Some items show signs of use, minor stains, and fraying. Please understand that these are used items, and only purchase if you are comfortable with this.