By 1842, Victoria would have been, 23, and trying to appear very grown up. The skirts are widening (as are the hips and bust line after bearing two children), and do so even more in 1847 when she would have already had five children.
Super helpful size chart for children preemie to 10 yrs. Includes things such as height, chest, inseam, etc as standards for each size! found here: http://www.knotions.com/resources/standard_measurements/children's_measurements.aspx
These frilly little girl dresses from the year 1925 are all of a similar shape but represent a different assortment of details. Some have embroidery while others feature cute neck ties and contrasting details like pockets. Some show off a floral pattern and another displays polka dots.