WordPress: Checks if new post is created

gistfile1.php

<?php
/**
 * Checks if post status is new
 */
add_action( 'transition_post_status', 'post_unpublished', 10, 3 );
function post_unpublished( $new_status, $old_status, $post ) {

	if ( $old_status == 'new' ) {
		// do stuff for new post
	}

}