This photograph of a small girl appears to show her very thin arms. She is well dressed and appears healthy otherwise, so I suspect it is an optical illusion that she has such thin arms. Her right arm rests on the prop chair, which is rounded and probably is blocking some of the view of her arm. Her left hand is grasping a chair spindle, and I think the spindle itself is blocking part of her left arm. It is unfortunate that the photographer did not notice these minor obstructions before striking the image. Often photographers considered themselves as artists, and a good photographer would not have allowed this illusion to have occurred.
The photographer in question was J. Holyland, located at 231 Baltimore St, Baltimore, MD. One hopes his other photographs showcased his subjects better.