You should always have back up equipment! I totally learnt my lesson the hard way during this session. I have a back up camera, and lenses but I don't have a back up light!
During this little girls session I noticed that my light kept mis-firing. One minute my light would flash and the next it wouldn't. It wasn't consistent enough that i was concerned, but it was more annoying than anything.
We're at the end of the session. I've gone through 5 or 6 set ups at this point and then .... nothing! My flash stopped firing! I knew I had enough set ups for her gallery, but I really wanted this last shot.
Most people would have panicked and called it a day. But not me! I've been trained to use both studio (artificial) light and natural light so it didn't even phase me! I spun the posing bag around, yanked up my window blinds and happily finished her session.
I think it's important that when you're choosing your newborn photographer that you really ask them about their experience. What sort of training does the photographer have and how long have they been specializing in whatever area of photography you're looking into schedule a session for.
And now - a before & after of one of the pictures from the "oh my! my light just died" session.