Spectra S2 comes with the following accessories; breast shields, flanges, motor, ac adaptor, two storage containers and tubing. (babygearspecialist.com)
So consider the following accessories to have with your baby walker. (babywalkerpro.com)
The Sola has following accessories that can be purchased separately: cup holder ($ 15), sun cover ($ 60), car seat adapter ($ 70), foot muff ($ 80), carrycot / bassinet ($ 180). (momsstrollerreviews.com)