I am not sure but this is probably early 1920s to 1930s definitely antique.
This white baby gown is 100% Cotton with a Scalloped Hem and a 3 Button Back closure with Cap Sleeves.
This is a used garment with some discolorations at the neck area, Shown in pictures.
No rips or tears and buttons are present.
This nightgown measures 15" Shoulder to hem, 18" hemline laid flat, 12" pit to pit , 5" arm opening and a small 3.5" neck.
Scalloped on all edges, even the cap sleeves.
3 buttons on the back opening.