As soon as you give birth your body starts making prolactin. Prolactin is what tells your body to fill the breasts each time you essayedge.com review feed your baby. With each breastfeed, the prolactin levels increase, but levels drop if breastfeeding is not frequent enough. It is important to keep high prolactin levels to keep your supply up. This is why cluster feeding is so important. When babies reach growth spurts they cluster feed to increase your supply to meet their needs.