Lifefactory's 4 ounce glass baby bottle with silicone sleeve has a modern, sophisticated design that appeals to everyone. Each bottle comes with a stage 1 silicone nipple for babies 0-3 months old, is easy to clean and dishwasher safe. The bright colored silicone sleeve (patent pending) helps to protect the bottle from breakage and provides a great gripping surface and tactile experience during feeding. Both the bottle and the sleeve can be boiled or put in the dishwasher together and can also go in the freezer, making breast milk storage simple. All bottles are bisphenol-A (BPA), phthalate, and polyvinyl chloride (PVC) free. The inventive silicone sleeve is non-toxic and free of plastics, the silicone nipple is non-toxic and latex-free and the bottle is made from borosilicate glass and is therefore thermal shock resistant (allowing it to go from the freezer to boiling water without shattering). Each bottle is designed to grow with your child as the included clear cover can also serve as an easy to hold cup. Or, simply twist on the solid cap (sold separately) and use your bottle for storing juice or snacks - perfect for a lunchbox or traveling.