It says 6Y, but it's a small size. I wore it a few times during one season when I was 4 years old. Please check the flat-lay size and the condition of the item carefully before making your decision. There is a faint name written on the inside of the back, which is blue. Personally, I don't mind it, but there is a small color fade on the front? I'm not sure what it is. If you are concerned about details, please refrain from purchasing. For those who understand that this is a used item. Please be sure to agree with the purchase. I was complimented on this swimsuit, saying it was mature-looking. :) It's still in good condition, so I hope someone will buy it. Please refrain from "likes" without the intention to purchase, as they will bury comments, etc.