this kind of feeding bottle is made fromPP and silicone, which isfood grade and BPA free.It is safe and comfortable for babies to suck. It can resist temperature from-20℃ to 120℃. the bottle is transparent andResistant to acid, alkali, and impact. the whole shape is seamless and smooth, so it is easy to clean. Its nipple is breast-like designed, which can relieve babies' emotion and help the growth of oral cavity. If the baby stops sucking, the current  will be cut automatically andPrevent the baby from choking.