Lansinoh’S Momma Feeding Bottle With Naturalwave Teat Has Been Specially Designed So That Your Little One Can Enjoy Your Expressed Breastmilk Even When You’Re Apart. Based On More Than 50 Years Of Research, The Naturalwave Teat Promotes Your Baby’S Instinctive Sucking Action For Natural Oral Development, Which Helps You Switch Easily Between Breast And Bottle So That You Can Maintain Your Established Breastfeeding Patterns. Extensive Research Has Revealed That A Baby’S Sucking Style Is Very Different To An Adult’S And Involves Three Key Steps. These Are The Initial Latching On, The Peristaltic Tongue Movement (In Which Your Baby’S Tongue Moves In A Wave-Like Motion), And Swallowing. It Is Very Important That A Baby Is Able To Perform The Peristaltic Tongue Movement As It Encourages Natural Oral And Jaw Development. Lansinoh’S Naturalwave Teat Is Clinically Proven To Encourage This Natural Feeding Pattern. This Twin Pack Includes 2 X 240Ml/8 Oz. Bottles With Medium Flow Teats.