This particular cabinet card was trimmed along the top, presumably to fit into a frame. The child looks to be about 6 months of age, round of face and sweet looking. At first I thought this might be a boy, but then noticed the necklace, so am guessing at a girl. The chair is the typical velvet-upholstered affair common in portrait studios even today.
The photographer was Kimball at 140 Court Street, Boston.