A crying child, all alone definitely does not fit. These hell-spawn lure curious adventurers by weeping loudly. They are then found sitting in a corner, head in their arms and crying for their mother. Between sobs they will tell a tale of abduction, torture and fear, ever luring the kind-hearted fool ever closer.
Be warned, for I have seen this very horror with my own eyes; when the doomed soul gets close enough, the child-thing sits up and opens its eyes ... by the gods in the heavens, its terrible, terrible eyes.