Photo backdrop Baby Drop photography background BD4131 great photo prop, 3'x4' Printing, Roll up for Easy Storage Photo Prop Carpet Mat Sizes: 3'x4' Most economical backdrops for babies and children. Baby Drops backgrounds are 3x4, computer generated and easy to use. They can be used as a wall or floor. Baby Drops are printed on a heavy-duty, matte vinyl. They are shipped rolled and hang quickly from a stand using clamps.