Lansinoh natural wawe teat with fast flow 2 featuresthe lansinoh naturalwave® bottle teat ensures the continuity of the baby's instinctive technique (peristaltic tongue movement) while sucking the breast, thus allowing the baby to transition from bottle to breast-feeding to bottle. and chin development. it does not contain bpa and bps. with the avs™ air intake system technology, air enters the bottle and prevents swallowing air, which is the potential cause of colic. lansinoh naturalwave® teats are available in 2 packs with 3 flow options. slow , medium and fast flow pacifier options are available. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.