Some beautiful restoration work there, folks!
Re the dating of this photo to 'circa 1900', I agree with Jim1 - I think it's quite a bit later than that.
I am definitely no expert, but I do have one or two photos of my grandmother, born 1877, when she was in her very early 20s, just before her marriage in 1900. It seemed to be a period of tight bodices, high necklines and long skirts - absolutely nothing like the looser, casual style of dress worn by the woman in this photo. And the way the child is dressed? When did little white sock and black t-bar shoes come into fashion for children?
Sorry, but to me 1900 seems quite a bit too early.
Anne