This nursing bottle is made from premium crystal clear material. It comes with a SofTouch Wide-Neck Teat that can be changeable to accommodate the different developmental stages and needs of a baby. For 0+ months. Comes with SS size nipple specially designed for newborn baby. The opening of the nipple is round-cut which allows milk to flow out consistently and gradually. Newborns have yet to develop any jaw muscles, thus the nipple is designed to support their sucking ability at this age. Clinically tested for seamless switch between breast and bottle feeding. Made of Polyphenylsulfone material with high heat resistance and excellent durability. Anti-Colic System to reduce air intake that causes colic. BPA and BPS free.