Wordpress - parent child post loop

<?php
foreach( get_terms( 'types', array( 'hide_empty' => false, 'parent' => 0 ) ) as $parent_term ) {
  // display top level term names + display
  echo '<div class="archive_box"><header><h3>'. $parent_term->name . '</h3></header>';

  foreach( get_terms( 'types', array( 'hide_empty' => true, 'parent' => $parent_term->term_id ) ) as $child_term ) {
   // display name of all Children of the parent term
    echo '<div class="tax_section"><h3 class="tax_name">'. $child_term->name . '</h3>';
	echo '<ul class="archive_content">';

	//Loop goes here!
	// WP_Query custom post type "archives", display 3 latest posts from the current CHILD term

	echo '<li><a href="permalinkhere">POSTNAMEHERE <i class="fa fa-arrow-circle-o-right" aria-hidden="true"></i></a></li>';

	//end loop
	echo'</ul><a href="'. $child_term->slug .'" class="button">More '. $child_term->name .'</a></div>';
  }
  //end archivebox
  echo '</div>';
} ?>