We saw no babies there though. Also there wouldn't be enough children to maintain a stable gene pool and nobody there had the knowledge of how to raise a baby without killing it. Do you honestly think a few ten year olds living off fungus in a cave can raise a child? Little Lamplight could have been a cool place if it wasn't made up entirely of children and if it wasn't right next to the mutant vault. Of course someone at Bethesda had to go, "Wouldn't it be lulz if there was a town made up like, entirely of little kids? And all those little kids like to act like grown ups and swear a lot, that'll be even more lulz!!!1 You can't kill them though cause that would be bad."