ńanè Nature Grip feeding bottle is made of high quality food-grade polypropylene. The streamlined shape and the grooves on the bottle are specially designed for babies’ little hands to Easy-Grip the bottle comfortably when learning to self-feed. The Easy-Mix function enables the parents to blend the milk formula by twisting the sides of the bottle vertically with both hands instead of using the conventional way of shaking the bottle where air bubbles are accumulated and will make the babies colicky.