These nipples are modeled after MOM, following the same natural form, feel and function of the real thing. Because they mimic breastfeeding, bottle preference and rejection as well as nipple confusion are greatly Reduced. The gradual transition from nipple to wide-neck base makes them easy to latch and encourages proper tongue positioning. With 3 nifty stages to ensure your hungry baby gets the right amount of milk or formula at the right flow, these 100% silicone nipples are dishwasher safe. Made to work with our reusable silicone pouch bottles, air Free feeding has never been easier.Stage 3 Fast flow, 6 Months and up (Pack of 3) .Fit for 4 oz and 8 oz Nursh silicone pouch bottles.