Display children of current page in summary list

On the current website I am working on, there are a couple of main pages, with several child pages each. When the user is viewing one of the main pages, I am using the following code to list the child pages, a thumbnail for each child, and a short description.

<?php
$pages = get_pages('child_of='.$post->ID.'&sort_column=post_title'); $count = 0; foreach($pages as $page)	{ ?>

<div class="indi">

<img src="<?php $thumbpic = get_post_meta($page->ID, "Thumbnail", true);echo "".$thumbpic.""; ?>" class="thumbpic"/>

<div class="story">

<h4><a href="<?php echo get_page_link($page->ID) ?>"><?php echo $page->post_title ?></a></h4>

<p><?php $subsum = get_post_meta($page->ID, "Summary", true);echo "".$subsum.""; ?></p>

</div><div style="clear:both;" ></div></div>
<?php } ?>

The code works. Only one problem: the children are listed alphabetically. Can anyone tell me how to modify the above code to list the children in order of priority?