How to exclude a child page from the list

Hello all, I’m trying to figure out how I can exclude a child page from not displaying on my list. Here’s my code I got from codex. Any help would be appreciated.

<?php
				  $children = wp_list_pages('title_li=&child_of='.$post->ID.'&echo=0');
				  if ($children) { ?>
				  <ul>
				  <?php echo $children; ?>
				  </ul>
				 <?php } ?>