How to Display a List of Child Pages For a Parent Page in WordPress

you can use post_status.

post_status
A comma-separated list of post status types that should be included. For example, ‘publish,private’.

possible values are: (publish|inherit|pending|private|future|draft|trash)

or you can also play with:

include
Only include certain Pages in the list generated by wp_list_pages. This parameter takes a comma-separated list of Page IDs.

more about it here.. http://codex.wordpress.org/Function_Reference/wp_list_pages