maternity bridesmaid dresses

Why is it that you carry 8 Maternity Bridesmaids dress but only 1 shows a model that has a bump? How is one to know what the dress will look like when the model is a size 4 or smaller????

maternity bridesmaid dresses - David's Bridal Shop Beautiful Maternity Dresses for your Wedding Party at David's Bridaldavidsbridal.com