Re: Baby prefers left breast?
A lot of babies develop a preference for one breast over another. It's fine to nurse primarily on just one breast, as one breast is generally sufficient to make milk for at least one baby. (Think of moms of twins- they essentially nurse with just one breast per baby.). The big problems with one-sided nursing are lopsidedness, which can become a visible nuisance, and the fact that if baby won't use your "B" side, you'd left without a spare if something happens to your "A" side.
Try varying your nursing position so that you're holding baby in the exact same position for breast A and breast B- sometimes that will trick baby into taking the B side.
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!"