50 years of extensive research revealed that a baby's sucking style consists of 3 key steps: latching on, peristaltic tongue movement (wave like motion of the tongue) and swallowing. It also became apparent that a baby needed to be able to perform the peristaltic tongue movement in order to encourage natural oral and jaw development.The peristaltic movement, which gives the name to the teat, is a smooth wave-like motion of the baby’s tongue, compressing the mother’s nipple to extract milk. With a wide base, the NaturalWaveTM teat encourages a wider latch-on, similar to the baby’s natural latch that mimics the same tongue movement and aid moving easily from breast to bottle and back again. Super soft and flexible for optimal compression, this 100% silicone teat allows baby to employ the natural sucking rhythm.As recommended by health professionals, the NaturalWaveTM teat has a gradual slope for improved suction, while the teat’s structure is strengthened with innovative inner vertical ridges to make it collapse resistant so baby can enjoy a comfortable feed. For peace of mind, AVSTM Air Ventilation System reduces intake of air, a potential cause of colic. To meet baby’s changing needs, the one piece, hassle-free NaturalWaveTM teats are available in slow, medium and fast flows.