The Silicone Orthodontic Bottle Nipple is fully compatible with all Gen. 3 bottles (glass and silicone) and storage containers, transforming them into a handy baby bottle! Our Orthodontic Bottle Nipple is designed to provide the most natural feeding experience possible for you and your baby. The orthodontic thumb-shaped nipple mimics the shape of a mother's nipple during breastfeeding, and the offset position allows you to safely feed your baby without completely inverting your bottle. The anti-colic vent allows your baby to feed continuously without taking in air bubbles or having to gasp for air between latches.