How to get replies of a comment?

Question

As comment_ID is a unique value, there is no need to include the post_id in the arguments.

This works fine for me:

$args = array(
    'status' => 'approve', 
    'number' => '5',
    'parent' => 3194
);
$comments = get_comments($args);

This will return 5 approved comments whose parent is the comment with the comment_ID 3194.

Sample output could be done with something like this:

foreach($comments as $child_comment) {
    echo $child_comment->comment_ID;  
}