Multi query array()

I am working on a site which lists models.
For every model I create a page, which have several custom fields, one of them is dob for the date of birth.
This value is defined as mm/dd/yyyy.

I want to create a query which retrieves all the pages where the dob mm/dd/yyyy gets stripped to mm/dd and then compared to the current date to see if it is today.

I use the following code/query. There’s 1 disadvantage; when there are 0 results the header and

still shows.

Anybody have a tip ?

$args = array(
		'post_type' 	=> 'page',
		'post_parent' => '2',
		'orderby' 		=> 'title',
		'order' 			=> 'ASC',
		'showposts' 	=> '-1',
		'meta_key' 		=> 'dob'
	);
	$bday = new WP_Query($args);
	if ($bday->have_posts()) :
	echo '<aside id="birthdays" class="widget">';
	echo '<h5>Today\'s birthdays</h5>';
	echo '<ul>';
	while ($bday->have_posts()) : $bday->the_post();
		$dob = get_post_meta($post->ID, 'dob', true);
		$bdate = substr($dob, 0, strrpos($dob, '/'));
		$today = date('m/d');
		if ( $today == $bdate )
		{ ?>
					<li class=""><a href="<? the_permalink(); ?>" title="See all galleries from the birthday babe"><? the_title(); ?></a></li>
<? }
	endwhile;
	echo '</ul>';
	echo '</aside>';
	else : endif;