Ideal for newborn, Preemies, Twins!. Pediatrician designed and recommended. Recommended use from birth to 8 months or (max. Wt.17 lbs/28 Inches tall). Comfortable, anatomically designed to fit the contours of the babys body. Adjustable slide-stop follows the growth of the baby. The shape of the seat allows water to flow behind the baby. Babys head is well supported. Strong suction cups prevent the bath seat from slipping and give it stability. Can be used in most bathtubs and sinks. Not suitable for Non Slip surfaces.