The New Philips AVENT 9 ounce Natural bottle is the most natural way to bottle feed. The wide, breast shaped nipple promotes natural latch on so you can easily combine breast and bottle feeding and the unique comfort petals provides an extra soft, flexible nipple without nipple collapse. In addition, the anti-colic slow-flow nipple helps newborns feed comfortably and easily and the ergonomic shape makes it comfortable for parents to hold and easy for small fingers to grasp. Assembly is simple with only a few parts and the wide bottle neck makes filling and cleaning easy. This AVENT Natural bottle is made from polypropylene, a BPA-Free material and works with all nipples, rings, and caps from the Natural line.