This wide neck 8oz borosilicate glass baby bottle is designed to grow alongside your little one. With a variety of nipple sizes and sippy caps our bottle adapts to your baby's changing needs. As your little one graduates from “cradle to kiddo”, our vented sippy caps (9+months) quickly convert a baby bottle to a silicone sippy bottle. The wide neck makes it easy to fill and clean while the silicone grip makes it easy to grip and easy to love.