Congratulations on getting your first yorkie baby. I have my first one right now but he's 6 months old. One thing you really have to watch with the little ones is that they eat enough to keep up with their energy levels.
Get some Nutrical and give to your little one like 3 times a day so she doesn't get hypoglycemic on you. If you give them this, you won't have to worry about them not eating enough. I learned the hard way with Reggie.
Good luck!