Query from parent page

<?php

// args
$args = array(
    'numberposts'   => -1,
    'post_type'     => 'page',
    'post_parent' => 13123
);

// query
$the_query = new WP_Query( $args );

// loop through posts
if( $the_query->have_posts() ): ?>
    <?php while( $the_query->have_posts() ) : $the_query->the_post();?>

	<a class='serv item' href="<?php the_permalink(); ?>">
		
	<div class='serv-iw'>
        <div class='serv-img item-img flt' style='background-image: url(<?php echo get_the_post_thumbnail_url(); ?>);'></div> 
	</div> 
		
		<div class='serv-co'>
        <h2 class='h3 mr'><?php the_title(); ?></h2>
		<div class='arr-link'><div class='arrc'><i class="fal fa-arrow-right"></i></div></div>

		</div>	
		
	</a>


    <?php endwhile; ?>
<?php endif; ?>