[Advanced Custom Field] Display child page under parent page

Hi everyone,

I have 12 child-pages that will be updating each month, I like to display the latest child-page under parent-page(landing page) dynamically. I used ACF’s True/False to define the latest page.(https://www.advancedcustomfields.com/resources/field-types/true-false/)

if( get_field('this_months_issue') )
	{
		echo "<span class=\"issue-status\">/?This Month's Issue</span>";
	}
	else
	{
		echo "<span class=\"issue-status\">/?Previous Issue</span>";
	}

https://imageshack.us/a/img202/6249/checkboxr.jpg
https://imageshack.us/a/img541/2820/menurp.jpg

so far the closest solution i found is to redirect it to the first child, the Jan (previous issue). I want it to be dynamic like if i updated March issue then it will land on March and not Jan. (https://www.wprecipes.com/wordpress-page-template-to-redirect-to-first-child-page)

<?php
/*
Template Name: Landing
*/
if (have_posts()) {
  while (have_posts()) {
    the_post();
    $latestissue = get_pages("child_of=".$post->ID."&sort_column=menu_order");
if ($latestissue) {
$firstchild = $latestissue[0];
wp_redirect(get_permalink($firstchild->ID));
}
  }
}
?>

but i don’t know how to link it with the custom field value, anyone can help? Thank you very much in advanced.