How to sort child pages on parent

Hi!
I have made a template for a one-page-scrolling website and i used the code found on this topic:
http://wordpress.org/support/topic/displaying-child-page-and-template-on-parent?replies=8
to display child pages (with their templates-parts)

<?php

global $wp_query;

// is Page a parent page
if ( $post->post_parent == 0 ) {

	// on a parent page, get child pages
	$pages = get_pages( 'hierarchical=0&parent=' . $post->ID );

	// loop through child pages
	foreach ( $pages as $post ){

		setup_postdata( $post );

		// get the template name for the child page
		$template_name = get_post_meta( $post->ID, '_wp_page_template', true );
		$template_name = ( 'default' == $template_name ) ? 'page.php' : $template_name;

		// default page template_part content-page.php
		$slug = 'page';

		// check if the slug exists for the child page
		if ( locate_template( 'content-' . basename( $template_name ) , $load, $require_once ) != '' ) {
			$slug = pathinfo( $template_name, PATHINFO_FILENAME );
		}

		// load the content template for the child page
		get_template_part( 'content', $slug );
	}
}
?>

The contents from the different child pages are automatically ordered alphabetically, I am now looking for a way to sort them in the order defined in the back-office (‘Order’)
here is the project i am working on:
http://bg-press.com/dev/eugenieviellard.com/

Thanks for your help…