ali,
I hope things are going well for you and your baby girl. I can't imagine the stress this has brought on you.
Yeah, about the dog-I didn't want to mention anything about that yesterday, either. I am no expert, but being a vet tech for over 17 years, I have seen my share of this happening. Obviously, the most important thing is to make sure your baby is safe. And, even if this never happens again, this will always be in the back of your mind. I strongly suggest that you find a animal behavior specialist in your area. I don't know where you live, but you'd be surprised how many are out there, and some will do phone consultations (although it is much better for the specialist to be there in person).
Also, once you calm down and can really think about what exactly happened when your dog bit her, you may realize why he did it. There are so many reasons he could have done it-jealousy, playing too hard, he was being protective of her-there's so many reasons-including no real reason.
Anyway, that's just my unsolicited opinion, LOL. BTW-depending on the state you live in, there are usually animal behavior specialists at the Veterinary Schools. If you'd like, I may be able to point you in the right direction. Like I said before, let me know if I can help in any way.
Your family is in our thoughts and prayers.