Some folks seem to be missing the point you made about shooting indoors, natural light, with a 2 year old, as well as the expecting mom. Even 1/60th is too slow for some toddlers. You'll need to use high speed film so you won't have a blurry toddler in every shot. I've used TMAX 3200 and Delta 3200. Currently I use the Ilford because it's cheaper and more available here. In 120 you won't find the grain excessive, unless you develop in Rodinal. If you look at the pregnancy shots in my gallery, they're almost all on one of these 2 films (except LF ones). Have you got acess to a darkroom to print them yourself?