Tandem strollers enter the picture at about the same time as baby number 2. Graco makes several tandem stroller models that are meant to accommodate a variety of child sizes, weights and configurations. Some start out as a single-seat stroller and give you options to add more seating later. Others hold snap-in vehicle car seats or feature benches that better suit older children. The most versatile tandem strollers offer nearly endless options that allow children of different ages to eat, drink, sit, stand, or nap. Be sure to check weight limits, as well as snack tray and sippy cup options.