C.B.
I do not have experience with that kind of pump. I know that Madela pumps are very efficient. For a 7 week old, pumping 3 ounces at a session is fantastic! Do not be discouraged! Eating oatmeal increases milk supply. Relax before a pump session. Allow your body a few days of frequent feeding and pumping to be able to increase volume. If your little one is going through a growth spurt (7 weeks is on target for the first major growth spurt)be happy with any amount you pump during this time.
Many moms have found that pumping first thing in the morning is the best time to get the most milk. Have the pump all set up and ready the night before. Pump in the dark for 10-15 minutes and do not look at your bottles. Have a blanket with your babies scent near to your face. YOu could also try pumping on one side while nursing the other. Some women have letdown on the opposite side with a half an ounce to an ounce!
First and foremost- the amount that you pump is not a guage of the amount your baby takes in at a nursing session! The average baby is more efficient at emptying the breast than any pump. Relax and visualize gallons of milk pouring out while you pump. Whatever you do- keep a positive outlook.
Papoose bebe in Norwich is a wonderful resource for pumps and breastfeeding support. Give them a call or schedule a lactation appointment. Best of luck!!!- Don't forget the oatmeal!!!!!