SECURE FIT: Sure & Secure Suction Cups on the arms keep the Summer by Ingenuity My Bath Seat in place during tub time, EASY SET UP: To install, simply extend the rear arm and place in bathtub opposite the faucet, position and lock rear suction cup, as well as both side suction cups, HANDS-FREE DESIGN: My Bath Seat provides baby with 360 degrees of all-around stability and support, freeing up your hands to clean and play; Dimensions: 16.5 x 15.5 x 9.5 inches, SUPPORTIVE BACKREST: A high and sturdy backrest gives your baby support; for infants ages 5-10 months who can sit up unassisted but who cannot yet pull up to standing, RECOMMENDED TUB SIZE: Fits standard rectangular bathtubs 21-24 inches wide; not for use in non-rectangular, oval, jacuzzi, or whirlpool-style tubs; only use one seat in the tub at a time