The Pigeon Flexible Slim Neck Nipple (6M+) with a Y-cut hole provides a natural, gentle transition from breast to bottle. Designed from over 60 years of research on babies' natural suckling, it flexes and moves with your baby's mouth for comfortable feeding. The slim neck fits standard bottles, and the Air Ventilation System (AVSTM) helps reduce gas and colic risk. Made from BPA/BPS-free, safe, and durable materials for worry-free use.