I totally agree with what Imagine has said. I have oversupply and forceful let-down but, like CarolleZ, the most I can get is about 5-6 oz, but I know Kara can get much more than this, she's much better than any pump could ever be. I also wanted to add that a baby increasing their nursing sessions can be an indication of a growth spurt. These happen during the first few days, around 7-10 days, 2-3 weeks, 4-6 weeks, 3 months, 4 months, 6 months and 9 months.

Also if you want to increase your supply, then personally I recommend booking yourself a couple of nursing nest days. Cancel all arrangements, stock up the fridge with food, get in some magazines or good books or good DVD's and just stay in bed with your baby, lots of water and nurse on demand for 2 days. Nursing nest days are a lovely way to rest, connect with your baby, and also get your supply back on track.