Lansinoh NaturalWave® Fast Flow Teats GB50 years of extensive research revealed that a babys 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 NaturalWave Teat has been specifically designed with this in mind so that baby can mimic the same tongue movement