I have a great photographer that I've used for my newborn shots, but she comes to you, no studio. T. Taylor Photography - let me know if you want the contact info. She is amazing, will spend a few hours with you and your kids until she gets exactly what you want, and is incredibly patient. Also, she gives you all the photos, on a disc, so you can get all the prints you want, email them, etc. She charges $250 per photo shoot, but she is top-notch, and I've found her to be absolutely worth it.
For clothing, I'm a big fan of naked tummy shots for newborns and also just a diaper. also, consider this, it is DARLING: Have her naked on her tummy on a big fluffy down comforter (solid color) and then get some wired light pink ribon and tie a big bow around her so that there is a big bow on her back, and then make a tag using sticker letters that hangs from the bow that says, "From God" like she is a gift from God.
Also, I HIGHLY recommend that you have the new baby in just a diaper and have your older child lean over her and kiss her on the forehead, she'll look up at them, it is DEVINE!!!
My experience with newborn shots is that clothes take away from the baby.
And finally, consider having a naked-chest daddy shot with totally naked baby, where their chests are together (so her woohoo isn't showing) - he can have his lips just resting on the top of her head like he's just finished kissing her...geez, this is making me want another baby just so I can take these photos again...