<?php
$children = get_pages("child_of=".$post->ID."&sort_column=menu_order");
$first_child = $children[0];
$first_child_permalink = get_permalink($first_child->ID);
?>
<a href="<?php echo $first_child_permalink; ?>">
<?php
$children = get_pages("child_of=".$post->ID."&sort_column=menu_order");
$first_child = $children[0];
$first_child_permalink = get_permalink($first_child->ID);
?>
<a href="<?php echo $first_child_permalink; ?>">
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