If the flange is of the right size, then the nipple should be able to easily move in and out of the tunnel without any discomfort or pain.
You should always start from a low setting while pumping. Once you are comfortable using the pump, you can slowly increase the suction.
Ideally speaking, you should pump milk until the milk stops flowing and continue pumping for 5 more minutes. This way, you will get adequate milk for a feed.
Make it a point to pump every 2-3 hours. To maintain a steady flow of milk. If entirely dependent on pumping, mom should ideally pump 8-10 times per day.
Keeping yourself hydrated not only helps to maintain a steady flow of milk but also keeps you healthy. You can consider drinking a glass of water after every feed.
It not only leaves you with less milk but can also cause soreness in the breast. You should always go for good quality breast pumps from reputed brands.
All material provided is for your information only and should not be construed as medical advice or instruction. Please consult your doctor.