Avent New BPA Free 9 oz. Feedding Bottle 2 Pack The AVENT BPA Free bottle is clinically proven to reduce colic. Build-in valve keeps air out of baby's tummy and lets baby control milk flow, which can help reduce the risk of overeating and spit-up. Supports breastfeeding with soft, naturally shaped nipples that promote proper latch on. The bottles are made from Polyether Sulphone (PES), which is a BPA Free material with a natural honey-colored tint. Easy, ultra-hygienic design that is easy to clean and assemble. All nipples and spouts are interchangeable with AVENT bottles and Magic Cups.