The Haakaa Gen. 3 Glass Baby Bottle is designed to provide a natural feeding experience for you and your baby. The orthodontic thumb-shaped teat mimics the shape of a mother’s nipple during breastfeeding, and the offset position allows you to feed your baby without completely inverting the bottle. The anti-colic vent allows your baby to feed continuously without taking in air bubbles or having to gasp for air between latches. Our glass bottles are made from temperature-resistant borosilicate glass, making them safe to heat and freeze and perfect for storing expressed breast milk! The Gen. 3 Glass Bottle is ergonomically designed to be held easily and comfortably during feeding.