Product Overview: Pigeon Peristaltic Silicone Nipples are designed to support a baby’s natural tongue movement, ensuring a comfortable and efficient feeding experience. Key Features: ‣ Stretchy, accordion-like nipple mimics natural breastfeeding motion for a comfortable latch. ‣ Encourages baby's natural peristaltic tongue movement for efficient feeding. ‣ Air Ventilation System (AVS) helps reduce colic caused by air intake. Specifications: ‣ Material: BPA-Free Silicone ‣ Size: Medium