Re: how much oz need for an 17 day baby?
Colleen posted all the right links. Check them out before you increase your use of formula!
One reason why we're not concluding "Oh my gosh, she has low supply!" is that it's 100% normal not to get much milk when you pump, especially at first, because:
1. Pumping, like hand-expressing, is a learned skill.
2. Not all moms respond well to the pump, and many moms with perfectly adequate milk supplies can't pump very much.
3. Every mom responds differently to every pump. You may not have the right pump for your needs. In general, manual pumps are the least effective, single electric pumps are a step up, double electric pumps are another step up, and hospital-grade double electric pumps are at the top.
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!"