I'm putting together a baby photography ad for Craigslist. My current ad is more general - "family" photography, including babies, kids, couples, individuals. I figured I ought to do some audience targeting, and now I've done enough shoots that I have a wide selection of pics for each of those categories. I have enough to make separate ads for (1) babies, (2) toddlers and (3) families.
I've done some light investigation into Baby Photographing Companies. They work in hospitals, so they can offer photo packages to parents as soon as babies are born. It looks like those photographers require some salespersonship experience, and pay is based on commission. Hmm, well I'm going to press on with being my own photography boss for now.