A Practical And Affordable Package Of 2 Naturalwave Fast Flow Teats That Were Created With Breastfed Babies In Mind. Made Out Of Soft, Flexible 100% Silicone, They Offer A Unique And Innovative Design That Allows The Baby To Switch Between Breastfeeding And Bottlefeeding And Vice Versa. This Way She Can Tolerate The Brief Separation From Mum Without Giving Up The Most Precious And Complete Baby Food There Is: Mother’S Milk. In Addition The Avs (Air Ventilation System) Blocks Air, A Potential Cause Of Colic And Spitting Up, From Entering, Allowing The Baby To Feed Peacefully And With Maximum Comfort. Also Available In Slow Flow And Medium Flow Versions. Why We Like It So Much: Natural And Healthy: The Peristaltic Naturalwave Teat Encourages The “Wave” Movement Of The Baby’S Tongue, And Replicates The Actual Way He Sucks The Breast, While Drinking Maternal Milk That Has Been Expressed Into A Bottle; This Promotes A Healthy Development Of The Mouth, Jaw And Face. It Has Been Clinically Proven That The Naturalwave Teat Reduces The Preference Of The Baby From Nursing At The Breast To Be Able To Make The Transition To Drinking From A Bottle, With A Problem-Free Subsequent Return To The Breast. The Package Contains: 2 Fast Flow Naturalwave Teats Material : 100% Silicone (Bpa Free), Soft, Flexible, Designed For Optimal Compression Peristaltic Naturalwave Teat With Avsair Ventilation System Anti-Colic System