Product Description Features A unique nipple with a v-shaped valve at the base, enabling a venting process, thus providing a smoother flow of liquid, enhancing drinking performance, and preventing colic. Designed to resemble breast feeding and help form baby’s palate by improving suction. Made from high quality medical grade silicone. Volatile and nitrosamine safe. Odorless, tasteless, and guaranteed not to perish. Age limit 0 – 3m