If I could only get one flexible seat for my kiddo, it'd probably be the beyond-versatile Flex-Space Comfy Floor Seat ($60). The chair features cushioned back supports that adjust to the perfect position. Simply lift the back of the seat forward to create an upright sit or let them try a few different lean-back options. Plus, the back can lay flat for quick storage when not in use. On top of that, the microfibre covers — available in several colours — are removable and machine-washable.