The wide breast shaped nipple promotes natural latch on similar to the breast, making it easy for your baby to combine breast and bottle feeding. Petals inside the nipple increase softness and flexibility without nipple collapse. Your baby will enjoy a more comfortable and contented feed. Innovative twin valve designed to reduce colic and discomfort by venting air into the bottle and not baby’s tummy. Due to the unique shape, the bottle is easy to hold and grip in any direction for maximum comfort, even for baby’s tiny hands. Wide bottle neck makes filling and cleaning easy. Only a few parts for quick and simple assembly. The Philips Avent Natural bottle is made of BPA free material (polypropylene).