How to display get_the_category of post showing only CHILD of category “X”

I’m trying to display the get_category_category limiting the results to only the child categories of parent “666”.

So a post may have a number of categories e.g. “1234”, “666”, “666/1341”, “5”, “5/17” but I only want to show the child of “666”.

$args = array( ‘numberposts’ => ‘5’,’post_status’ => ‘publish’,’category’ => ‘1234’,’category__not_in’ => ‘680’, ‘orderby’ => ‘post_date’, ‘order’ => ‘DESC’ );
$recent_posts = wp_get_recent_posts($args);
{

///I want to return the category for each post in this loop that is within the “666” category.
///E.g get_the_category($recent[‘ID’]) where the category is a child of 666

echo “POST ID” . $recent[‘ID’] . ” CHILD CATEGORY “. $childcategory;
}

The above loop will return the last 5 posts in category “1234” with each child category of “666”.

e.g.

POST ID 10 CHILD CATEGORY 1341
POST ID 11 CHILD CATEGORY 1341
POST ID 14 CHILD CATEGORY 99
POST ID 19 CHILD CATEGORY 1341
POST ID 23 CHILD CATEGORY 99

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