This is an adorable vintage Polly Flinders baby dress from the 1980s. Made of poly/cotton fabric, it's smocked as the front yoke, the back yoke is not smocked, has a Peter Pan collar, and short puffy sleeves. Buttons down the center back.
 
Pre-owned, used; in good condition with no noted flaws
 
Labeled as size 6/9 months. The actual dress measurements are as follows--
Pit to pit- approx. 12" between underarm seams
Center front length- 11 3/4"
Hem- 42" around