Check if post has children or not

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You can first attempt and get a list of post’s children. If the returned value was empty, then the post has no child. Here’s how you do it:

$args = array(
    'post_parent' => get_the_ID(), // Current post's ID
);
$children = get_children( $args );
// Check if the post has any child
if ( ! empty($children) ) {
    // The post has at least one child
} else {
    // There is no child for this post
}

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