I don't think you stand to lose much of your demographic prowess by including babies. I may be wrong, but I know that if I were to advertise through FTL, I'd be looking for who was listening, and baby pictures don't invalidate adult pictures.
Maybe you could pick up someone trying to reach mothers or parents. If you allow baby girls in the shrine, it'd catch those ad bucks without having to add an all-babies FTL shrine (as adorable and grotesque as that would be).
Including girl-babies is beyond the scope of intent for the shrine, but it seems like a "no harm, no foul" situation to me. Maybe you could just incentivize adult contributions ever so slightly.
Also, encourage nudity - it's nice to see cute babies and floppy saddlebags in one convenient location.
Edit: "Flopp E. Saddlebags" is my new Drag name.