Pagination 404 Not Found child page

does your query have this

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args = array(
  'posts_per_page' => 3,
  'paged' => $paged
);

query_posts($args);

see documentation about pagination http://codex.wordpress.org/Pagination

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