There just doesn't seem to be much interest in the kids.  DAZ never even made a basic clothing pack for them.  Plus, there is the whole sexual angle.  DAZ won't even allow nipples on "child" textures (even though you can use the same textures with adult figures). 

The MilGirls had a lot of stuff, but most of it was fairy clothing and such.  A lot of it was pretty adult and sexy, and I think people just aren't comfortable with that any more.

I would buy stuff for the kids, but I'm more interested in fantasy or historical than in contemporary clothing. 

Picker's Angel has made some really cute clothes for the kids.  And PoserFashion.net has some nice historical dresses for Laura.