My 6 week old is exclusively breastfed at the moment. I have to leave him for the day at the end of next week and have borrowed an electric pump to express his milk for the day. I know all babies are different but can anyone advise how much I'll need to express to get him through the day? He seems quite a hungry baby but obviously I have no idea how much he gets through a day. Also can anyone tell me how much I should express each day? I'm worried about leaving him short if I express too much. I've only started today and have 3oz in the freezer so far.