NaturalWave Teats are the result of extensive and lengthy research. They guarantee mothers to be able to easily switch between breast and bottle, with confidence and the maximum guarantees. Promotes natural oral development, following the established lactation pattern. 50 years of extensive research have shown that a baby's sucking style consists of 3 fundamental steps. Grasping, peristaltic movement of the tongue (tongue moves like a wave), and swallowing. It is important to stimulate the peristaltic movement of the tongue, as this favors the natural development of the oral cavity and jaw. NaturalWave teats are specifically designed so that the baby imitates the same movement of the tongue and easily alternate between breast and bottle. The AVS Air Ventilation System reduces the entry of air and with it the appearance of gases and the discomfort commonly associated with colic in babies. Unique design: With progressive inclination that promotes a smooth wave movement of the tongue. Soft and elastic: The vertical ridges reinforce the structure of the teat and allow it to resist crushing in the mouth. Very soft teat: The wide and textured base of the teat allows an easy grip and effective sucking.