Can you add another pumping session into your day at work? 2-4 oz per session is actually a fairly normal output for one session. I have certainly never been able to pump more than that in one session at any point in my working and pumping experience over the last several months. So, what that meant for me: during the first year of my daughter's life, I needed to pump 4 times over a 9-10 hour shift. Most moms usually need at least three pumping sessions during the work day to keep up. If your baby is drinking 8 oz during the day, I bet a third pumping session will get you where you need to be!