I've just recently returned to work, DS is 4 months old. My DS feeds only one side per feeding and feeds about every 2 hours. I've been feeding him before I leave in the morning while pumping the other. Then I'll pump every 4 hours at work. First pump, I'll get about 10-12oz total, 2nd pump 8oz then 3rd pump is about 6 or 7oz. Does this seem about right to have a decrease throughout the day?