Clinically proven to reduce colic Anti-colic valve - for less air in baby's tummy A clinical trial demonstrated that at 2 weeks of age, babies fed with the AVENT Bottle experienced less colic than babies fed with a conventional bottle. * Aniti-colic valve flexes to allow air into bottle to prevent vacum build-up; air bubbles move away from nipple and into bottle, not into baby's tummy * Naturally shaped nipple promotes proper latch-on, easy to combine breast and bottle feeding * Wide bottle shape for easy filling and cleaning, dome cap seals nipple for spill-proof mixing and transportation * East to combine breast and bottle feeding * BPA -Free Bottles are made from Polyether Suphone (PES) - a BPA-Free material with a natural honey-colored tint