Flat And Inverted Nipple Lactation Model | Healthcare Training ModelBreastfeeding educators can use these three models to teach about different types of nipples and treatments for drawing out flat or inverted nipples. Two of the breast models are ideal for showing a flat nipple and an inverted nipple. The instructor can use these models to demonstrate how to perform the pinch test, which is used to determine nipple type. The breast with the functional nipple allows the instructor to demonstrate how a breast pump may