In newborn photography, a prop setup involves using various items such as baskets, beds, crates, buckets, or other decorative elements to create themed or stylized scenes for the baby. These props serve as both aesthetic additions and supportive tools to safely pose and showcase the newborn in different poses and settings. Each prop is selected based on the desired theme, colors, and dimensions, allowing for unique and memorable photographs that highlight the baby's early stages in a creative and visually appealing manner.