<?php
global $post;
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args = array( 'posts_per_page' => 4, 'category' => 1, 'paged' => $paged, 'post_type' => 'post' );
$postslist = new WP_Query( $args );
if ( $postslist->have_posts() ) :
    while ( $postslist->have_posts() ) : $postslist->the_post();  ?>

<?php
if ( has_post_thumbnail() ) {
    the_post_thumbnail(array(120, auto));
}
the_title();
the_excerpt(); ?>

<?php wp_pagenavi(); ?>