The Lifefactory Glass Baby Bottle is designed for infants aged 0-3 months, featuring a 4 oz capacity. Made from high-quality thermal shock-resistant borosilicate glass, this bottle can safely transition from freezer to boiling water. It comes with a protective silicone sleeve that not only helps prevent breakage but also provides a better grip for little hands. The bottle includes a Stage 1 silicone nipple, ensuring a comfortable feeding experience. Easy to clean, the bottle and its accessories are dishwasher safe, allowing for hassle-free maintenance. This product is crafted with care in the USA and Europe, ensuring high quality and safety for your baby.