I started pumping after my early morning feeding around 3 weeks pp. I was regularly pumping 4 oz, 2 oz per side, immediately after nursing my son. I am 4 weeks pp now, and have noticed my output has decreased by 50%, sometimes even more. I tried a pumping session an hour after I've nursed, and two sessions where I pumped in lieu of nursing (two hours after nursing), and I got the same dismal numbers: 1 oz on each side at best.
Are these normal numbers? I'm worried about being able to meet my son's milk needs when I return to work in 7 weeks.