Re: Can part of your milk supply dry up?
with everything the PP wrote. It's all supply and demand: demand more milk and you will make more. And you are already making more than enough, since 6-7 oz of milk at a nursing session is more than your baby is ever likely to need. Nurse on demand and ditch the shield, and everything should be fine!
I thnk it also might really help of you went to see a lactation consultant, preferably an IBCLC, for some help! When you're struggling with a difficult latch in a newborn, there's no substitute for the professional, hands-on approach.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"