Nipple: The nipple is a raised composition located in the middle of your breast. It has smaller muscles that deal in reaction to stimulation. If the breasts are stimulated with the suckling of her child, the mother's Mind secretes oxytocin. Significant levels of oxytocin trigger the contraction of muscle mass https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb