Follow a pumping schedule that is similar to a healthy newborn's feeding schedule. Pump each breast at least 10 minutes. If milk is still flowing well after 10 minutes, pump an additional 5 minutes. Even if milk stops flowing before 10 minutes have passed, continue pumping for at least the full 10 minutes. If you pump both breasts at once you may not only save time but also may raise the prolactin level in your blood.
Prolactin is the hormone that produces milk.
Relaxing can help trigger your let-down reflex. Sit in a comfortable position and relax your entire body. Practice the relaxation exercises taught in childbirth classes. Think about your baby, play soft background music, or read a good book or magazine. If milk flow does not begin after 5 minutes of pumping, stop.