For delivery room shooting, you need to expect low light and ugly flourescents. Some delivery room these days have windows, and others don't; I always turn off the overhead lights if there's a window available, even if it's a small one. I despise flash in delivery rooms, for a variety of reasons: first, it's less than kind to sensitive newborn eyes to pop a flash in his face; secondly, it puts too much of a "distance" in the images, turning a very intimate moment into a sort of clinical study. I much prefer to use fast film, up to 3200 if need be. I would advice shooting in B&W, since flourescents make for hideous color and, frankly, newborns and the soup they come out with are just a bit too graphic in color. Healthy newborns are always an alarming shade of purple.
Try to be kind to the mother, if you're photographing the delivery itself. Stand by her head in order to avoid really embarrassing angles that she would prefer not to share with posterity. Do be very mindful of your position, so you're clear of the doctors and nurses, machines and IV's, etc. It's important to steer clear of the critical path. Fast film is particularly good for making sure you don't need a tripod. Tripods in delivery rooms are best avoided.
As far as format and cameras, it's always good to use what you're comfortable with, provided it's up to the task. Personally, I prefer 35mm for births because things tend to move pretty quickly, and if you have to wait for people to stand still, you're going to miss shots. Likewise, if you're constantly having to reload your camera, you're likely to come up a day late and a dollar short. Some births are calm, predictable, and peaceful. Others are fast and furious. As there's no way to know which it's going to be, I'd bring anything you think you might need.
- CJ