Keep in mind I basically take snapshots. I've only recently tried to become "good" at photography, so I may be over-complicating things needlessly.
Personally, I'm not worried about flash and babies. Also, his parents have taken a lot of flash pictures with digital, so he is used to it. I just wanted to make things a little easier (and show them what film can do by presenting some nice enlargements). I'll do the B&W myself, but will have a lab process and print the color at this point.
The baby is African American with a dark complexion, and the adoptive parents are European American (the mother, my best friend's sister, being fairly light/pasty). I know this won't be a problem with color film. However, I've not used much B&W; I'm still learning how to use it. The few times I photographed mixed skin in B&W, I never mastered the exposure; I learned to do black & Hispanic, and Hispanic & white, but always had a problem with black and white subjects together. Even with burning and dodging (I'm not good at that either), it was difficult to get a decent print.
A photographer friend has given me some good advice, but it is for no-flash. Perhaps I could use flash for color and ambient light with a 400 ISO B&W film (after figuring out how to rate it for tungsten).
The only flash I have with x-sync is my Grandfather's old VIvitar 252 from his 35mm. I don't know if the flash will have enough coverage (plus I have to learn to use x-sync, lol).