Moving on, HTML standards are outlined here:

Nesting

Preference here is just to keep things organized and make sure to comment the closing tag of container elements (especially important when a page gets excessively long).

<div id="wrapper">
	<!-- #container -->
	<section id="container" class="home layout-978 <?php echo implode( ' ', page_classes() ); ?>">
	<?php if (have_posts()) : ?>
		<?php while (have_posts()) : the_post(); ?>
			<div class="col12 right" id="pediatric-home">
				<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>       
	                <div class="post-entry">
	                    <?php the_content(__('Read more &#8250;', 'elegant')); ?>
					</div><!-- end of .post-entry -->

				</div><!-- end of #post-<?php the_ID(); ?> -->       

			</div>
            
        <?php 
		endwhile; 
	endif; 
	?>  
	</section><!-- end of #container -->
</div><!-- end of #wrapper -->