I have a customer who has a very, very dark room that she wants to take portraits in. I'm photographing a 2 month old baby. What type of lighting should I use?
...first, you didn't say what kind of mood you'd like. Also, you left the question quite general. Hence I'll try to give you some general tips:
Good luck and good light!
We take photos with light. You can't take photos in a very dark room.
The usual approach for babies is to bounce the flashes off the ceiling (if its white). This gives a nice soft light.
These photos of my grand-daughter were taken with three small strobes/speedlights bounced off the ceiling.