Code in function.php child theme not executed.

Hi,

I have put some code in a child theme I created because my client wants me to hide the following on his website:
SKU on product page;
Product title;
Additional information tab;
Review tab;

So, in order to achieve this I put the following code in the child themes function.php:

<?php
add_filter( 'woocommerce_product_tabs', 'woo_remove_product_tabs', 98 );

function woo_remove_product_tabs( $tabs ) {

    unset( $tabs['reviews'] );
    unset( $tabs['additional_information'] );

    return $tabs;

}

   // Remove Product title

add_filter( 'woocommerce_product_description_heading', 'remove_product_description_heading' );
function remove_product_description_heading() {
return '';
}

  // remove SKU on product page

function sv_remove_product_page_skus( $enabled ) {
    if ( ! is_admin() && is_product() ) {
        return false;
    }

    return $enabled;
}
add_filter( 'wc_product_sku_enabled', 'sv_remove_product_page_skus' );

But the information stil shows in the frontend. When I put the same code in the function.php of the parent theme, it is executed properly.

What am I missing and how do I get it to work.

Thank you in advance.