Sample Page

<?php
$parent_id = 374; // The ID of /procedures/
$args = array(
    'post_type' => 'page',
    'post_parent' => $parent_id,
    'posts_per_page' => -1
);

$child_pages = new WP_Query( $args );

if ( $child_pages->have_posts() ) :
    while ( $child_pages->have_posts() ) : $child_pages->the_post();
        ?>
        <div class="child-page">
            <h2><?php the_title(); ?></h2>
            <p><?php the_excerpt(); ?></p>
        </div>
        <?php
    endwhile;
    wp_reset_postdata();
else :
    echo 'No child pages found.';
endif;
?>