Features: 1.A unique nipple with an air valve at the base, enabling a venting process, thus providing a smoother flow of liquid, thereby preventing against nipple collapse, colic, and spit up, burping, and gas. 2.Designed to resemble breast feeding and help form babyÍs palate by improving suction. 3.Made from high quality medical grade silicone.Volatile and nitrosamine safe. 4.Odourless, tasteless, and guaranteed not to perish. Age Limit-3m- 6m