Happy weekend ladies

Hopefully this doesn't sound too dumb, but I feel clueless when it comes to choosing a pediatrician for our girls. Trying to think ahead since it's a good possibility they'll arrive early.
How far in advance should this be done? Anything specific you think is important to look for when choosing a doctor/practice?
Any advice would be much appreciated. Thanks!
Re: Choosing a pediatrician?
I appreciate the tips!
It's twin girls!! Born on 11-2-14!
You would have to ask her or just check her credentials on their website.
- do they take walk ins
- do they have a sick side separate from the healthy side
- do they have a 24 nurse on call
- Overall comfort with the doctors
Most offices we spoke to like to see the baby the day after you go home from the hospital so we went ahead and selected one now.
I did have a ped practice for the kids when they were little (the fam. prac. hadn't formed yet) and I do not see an advantage to that vs. a family place.