[Product Features] The glass bottle does not contain bisphenol A, transparent, smooth inner wall, no milk dirt, easy to clean, no odor, no scratches, high temperature resistance, no chemical reaction caused by heating, no deformation during cooking. Safe and disinfected. This product is suitable for newborn babies.[Product material] The bottle body is made of high-quality borosilicate glass, free of BPA (bisphenol A), anti-aging, no scratches, high temperature resistance of 600 °, and durable. The nipple is made of Medicl silicone, with a heat resistance of -20 ° -120 °. The locking ring is made of food grade PP material, and the heat resistance is -20 ° -120 °.[High-quality design] The nipple imitates breast milk design, natural curvature, more suitable for baby's mouth to suck, the frequency ≈3 drops min when not sucking, anti-flatulence design, let the baby suck only milk without sucking air. The intimate design of the unidirectional air intake port forms an air circulation with the nipple outlet, balances the internal and external air pressure, reduces air bubbles in the milk, and the baby drinks milk effortlessly.[Notes] 1. When using for the first time, please be sure to clean and disinfect, and disinfect in boiling water for five minutes. 2. Before feeding, please confirm whether each part of the bottle is properly assembled. 3. Do not operate the glass bottle quickly and suddenly. After using at high temperature or under low temperature, please move the bottle to room temperature and then perform other operations.[After-sales service] If you encounter any product problems in the process of shopping, please do not rush to write your evaluation, please contact us, we will definitely give you the most satisfactory answer.