I'm due to go back to work when DD is 8 months old, I work Monday Wednesday and Friday, and would like to continue to feed her on the day I'm at home. Do I need to express to maintain my supply, or should it be established enough to just express if I become engorged? I have to do 2 days at 6 months too, but plan to express on those days as it's just a one off if that makes sense.