The breast normally refers back to the front in the upper body and medically specifically on the mammary gland. Once the breasts are stimulated from the suckling of her little one, the mom's Mind secretes oxytocin. Large amounts of oxytocin induce the contraction of muscle mass cells bordering the alveoli, https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb