This plugin provide two shortcode. Using the shortcode you can easily generate a childpage list, and also a sitemap.

Andy Stratton

List Children

Use an HTML comment to list links of the current page's children or siblings.

ksks

With this plug-in, you can use shortcodes to output list of children pages or sitemap. 
Write following shortcode in your post text.
Generate a sitemap : [get_sitemap] 
Generate a list of child and descendant pages: [get_childlist]
You can also customize output with optional arguments:
[get_childlist id=”parentID (optional)” add=”additional element (optional)” exclude=”exclude page by id (optional, e.g. exclude=”34,123,35,23″)” exclude_by_slug=”exclude page by slug (optional, e.g. exclude_by_slug=”test,hoge,home”)]

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