Mint, green, sundress, missing straps

Mint green, no boundaries child’s sundress child’s a size 3 to 5. However, this has a very stretchy back and is pictured on a dummy where the bust is set to 34 inches. The top is lined at the cup. I am very confused as to why this says it’s for children lol The lay flat measurements. The bust is 12.75 inches waist 12.75 inches with free hip. The length is 24.25 inches. (A004)