Ooh, I love babies that age! So snuggly! I would ask what their routine is and how much baby drinks, sleeps, ect. Get a feeler for what the baby is used to, but the benefit of a fresh baby is that you can really set the tempo for the relationship. They adapt so much better when they are newborns and the parents have not "messed with them" too much!
Just make sure they can drink a bottle!