$menu_object = wp_get_nav_menu_object('My Menu');

    $postlist = get_posts('orderby=date&sort_order=DESC');
    $posts = array();
    foreach ( $postlist as $post ) {
                $posts[] += $post->ID;
    }


$menuitems = wp_get_nav_menu_items( $menu_object->term_id, array( 'order'=>'ASC','orderby' => 'menu_order',
    'post_status' => 'publish', 'output' => 'OBJECT', 'output_key' => 'ARRAY_A'));


    $title = array();
    $item_id = array();
    $parent_id = array();
    $index = 0;

foreach($menuitems as $item){

     $title[] += $item->title;
     $item_id[] += $item->ID;


if($index === 2){
if($item->title !== get_the_title($posts[0])){

    wp_update_nav_menu_item($menu_object->term_id,0, array(
    'menu-item-title' =>  __(get_the_title($posts[0])),
    'menu-item-classes' => 'home',
    'menu-item-url' => get_permalink($posts[0]),
    'menu-item-status' => 'publish',
    'menu-item-parent-id' => $item_id[$index-1],
    'menu-item-position' => -1));

    }
        }
    ++$index;


    }