This wide neck 8oz borosilicate glass baby bottle is designed to grow alongside your little one. Lifefactory Wide Neck Glass Baby Bottle Mint. The wide neck makes it easy to fill and clean while the silicone grip makes it easy to grip and easy to love. bottle comes with a silicone sleeve, polypropylene cap, ring, stopper, and a Stage 2 (3-6 months) silicone nipple that enhances feeding by providing a more natural experience.