Innovative 4-ounce (120 ml) glass baby bottle with protective silicone sleeve, Stage 1 silicone nipple for newborn infants from 0 to 3-months and polypropylene (PP#5) cap, ring and stoppernThermal shock resistant borosilicate glass bottle transitions safely from freezer to boiling water; all components are dishwasher safe; sleeve and bottle can be washed/sterilized togethernProtective medical-grade silicone sleeve provides a tactile non-slip gripping surface and helps prevent breakagenBottle grows with baby--use with Lifefactory stage 1, 2, 3 and Y-cut nipples, sippy caps and leakproof flat caps ; compatible with most major breast pumpsnHealthy alternative to plastic bottle feeding--all components are made in the U.S. or Europe and are BPA/BPS-free and phthalate-freenGlass and silicone nipples are made in France. Silicone sleeves provide additional grip and shock absorption. Dishwasher safe. Nipples can be replaced with LifeFactory's wide range of caps as baby grows (sold separately). Compatible with most major breast pumps. Products assembled in the USA. All materials are FDA approved. BPA-free and phthalate-free. Made in the USA. This product may have a manufacturer's warranty. Please visit the manufacturer's website or contact us at for full manufacturer warranty details.