Sweet little set. I am unsure of the date, and guessing on that. Buttons up the back. Buttons are functional and firmly attached. The shirt Tag says 1 1/2 and I translated that to the modern 18 month size. The bottom tag says size 1. Please check measurements shown in photos, as some vintage clothing runs smaller than modern sizes. The shirt tag also states 22 1/2-26 pounds and the bottom tag states 18 1/2-22 pounds. The elastic is still stretchy in the diaper cover, but feels a little loose. It is, however, wearable. The top is not stretchy. From a nonsmoking home. Has a small brown spot on the front, just above the turtles. I tried to remove it but it didn’t come out. It is visible in the photos with the scissors. The material tag is no longer visible but does say machine washable, tumble dry.