Hannah RN, CLC | Your Breast Friend on Instagram: "This is a general guideline!… If you’re new to pumping I suggest starting in stimulation mode until you get your first letdown! Once milk flow starts you can switch to expression mode! Then, anytime milk flow stops or slows down you can switch back to stimulation mode to help trigger another letdown! That being said, this is a general guideline, and a way to start out when you’re new to pumping. Once you get the hang of using your pump, I sugges