The first thing to remember about pumping is that the amount you can get out by pumping is NOT the amount you have. It is much harder for you to pump the milk out than for your baby to get it out.
Lots of things affect the amount of milk you can get when you pump. Things like how tired you are, how stressed, if you are upset about something and also if you are worried about how much you can get. This can cause a vicious cycle with worry leading to less pumped milk which in turn leads to more worry.
To increase your supply breastfeed more. Whenever your baby will feed, feed her ? even if she doesn?t ask for a feed. If you are at work and away from your baby this means pumping more. You will get more milk if you manage to pump more often. It is better to pump for 10 minutes every hour than to pump for 30 minutes once every three hours. Even just one extra pumping session in the day will be a big help.
You might like to look at the instructions for the Marmet Technique,
http://www.lactationinstitute.org/MANUALEX.html. This is a hand expressing technique but there are instructions for you to massage and shake your breasts. You can do this with pumping instead of hand expressing. The massage and shaking is to help the let-down happen. The better your let-down happens the more milk you will collect.
Another suggestion is to hand express until you get the let-down and then pump. Some mothers find that hand expressing is more efficient at getting the let-down to happen.
It is difficult to say how much milk your baby will be drinking with each feed but 6 oz sounds like a lot for a breastfed baby. Please don?t compare the recommended amounts for formula fed babies as the amount a breastfed baby should have. Breastfed babies tend to drink about two thirds of what a formula fed baby does.
A one month old exclusively breastfed baby drinks about 750 mls (25 to 28 oz) in 24 hours and a six month old exclusively breastfed baby drinks about 750 mls in 24 hours. Some six month old babies like large infrequent meals, say five meals of 150 mls (5 ozs) and others still like to have lots of small meals, say eight meals of 95 mls (3oz).
You might like to join an e-mail support group for mothers who are pumping. The details are at
http://www.pumpingmoms.org/
Best wishes,
SARAH