Is there an optimal time to pump? I tried pumping yesterday and after like 20 mins i got barely a drop. My son is 9 days old and he poops like crazy and clearly gets plenty of milk. I know he got an ounce from one of my breasts in his pediatricians office because we weighed him after a feed. Is it possible I am just pumping when my stores are low? How long does one usually pump in order to get an ounce of milk? Does the setting you put it on matter? Thank you.