Natural Wave Teat, XS, 2 pieces, Lansinoh Lansinohs NaturalWave® XS teat is 100% soft silicone, safe for feeding your little one. The gradual design allows for a natural peristaltic movement of the babys tongue, so the transition from breastfeeding to bottle feeding and back is much easier for both of you. Features:NaturalWave® is Lansinohs new teat concept, backed by over 50 years of breastfeeding researchThe tip allows your baby to regulate the flow of milk, and the ventilation system helps reduce air intake during breastfeeding, a possible trigger for colicThe vertical silicone lines on the inside of the teat reinforce its structure, eliminating the risk of it flattening during the feeding processThe base of the teat is also wide and specially textured so that babys lips can easily grip it. About tongue flicking: Several studies have shown that breastfeeding involves three main stages: Latching - the babys lips are turned outwards, with the baby embracing both the nipple and part of the areolaTongue flicking - the tongue makes wave-like movements, compressing the breast and extracting milk, while also contributing to the babys good oral-facial developmentSwallowing breast milkThe baby repeats the tongue flicking movement approximately 800-1000 times during a breastfeeding session. BPA and BPS free Compatibility: Lansinoh 160 ml or 240 ml bottles. Recommended age: 0 months+ Presentation: 2 pieces