I found a solution! This is what I did:
<?php query_posts(array('orderby' => 'menu_order', 'order' => 'ASC', 'posts_per_page' => 1, 'post_parent' => $page_id, 'post_type' => 'page')); while (have_posts()) { the_post(); ?>
<a href="https://wordpress.stackexchange.com/questions/158490/<?php the_permalink(); ?>">Link</a>
<?php } ?>
<?php wp_reset_query() ?>
It makes a loop of sub-pages to a particular page and limits it to only 1 page. Nice and easy 🙂
Hope this can be of any help to someone else.