Re: Day 7 postpartum..
The pediatrician gave you ridiculously incorrect information. Babies LOVE to suck, and because they love to suck they will usually take a bottle even after a completely adequate feeding. And because bottles deliver very easy rewards- milk will come out of the bottle even if the baby has a sloppy latch, and it will come out much more steadily than from the breast- many babies start preferring the bottle. For those 2 reasons, I think that it's very unlikely that your baby will spontaneously start refusing bottles.
Because it's so easy for babies to get hooked on the bottle, I'd love to see you try a different supplementation method. In particular, an at-the-breast supplementer like the Medela Supplemental Nursing System or Lact-Aid could allow you to forgo bottles altogether. The SNS and Lact-Aid are basically small bags of formula or expressed milk which you wear around your neck. A tube comes from the bag, and you latch the baby onto the breast and tube simultaneously. At-the-breast supplementers are great because your baby will get the idea that ALL her meals come from the breast, and therefore she will be less likely to pop off the breast and fuss in order to get the bottle.
Some questions for you:
What sort of pump are you using?
How does pumping feel?
How was your birth? Did you have any postpartum hemorrhaging, or any problems related to the delivery of the placenta?
Do you have any history of PCOS or thyroid problems?
Are you currently using any form of hormonal contraception?
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!"