Count number of posts of current month

Question

I am trying to echo the number of posts for the current month from all categories but it isnt working.

<?php
$month = date('m');
$year = date('Y');
$countposts = get_posts('post_type=post&year=' . $year . '&monthnum=' . $month . '&cat=3');
echo 'New posts '  . count($countposts);
?>

category 3 is a parent category and has many sub categories. No matter what I do, it returns the value 5. I have published 30 posts for this month to test it but it doesnt count them. :(

What Im I doing wrong?

Update I have tried the following query and returns the same outpout

    <?php
wp_reset_postdata();
$current_year = date('Y');
$current_month = date('m');
$args = array(
    'cat'      => 3,
    'year'     => $current_year,
    'monthnum' => $current_month,
    'post_status'     => 'publish',
    'post_type'       => 'post'
);
$number_posts = get_posts( $args );
echo 'New posts '  . count($number_posts);
?>

Answer 1

This is because the paramenter posts_per_page of the get_posts() function defaults to 5. Set it to -1 in your $args.