From the parents website...
The main benefit of the height and weight reduction is that Ashley can be moved considerably more often, which is extremely beneficial to her health and well being. Currently, one person can carry Ashley, versus requiring two people or a hoisting harness and ropes, should she have grown larger. As a result, Ashley can continue to delight in being held in our arms and will be moved and taken on trips more frequently and will have more exposure to activities and social gatherings (for example, in the family room, backyard, swing, walks, bathtub, etc.) instead of lying down in her bed staring at TV (or the ceiling) all day long. In addition, the increase in Ashley?s movement results in better blood circulation, GI functioning (including digestion, passing gas), stretching, and motion of her joints.