Magento 1 get Bundle product children qty

getChildrenBundleProducts.php

<?php
$product = Mage::getModel('catalog/product')
				->load(9275);


$collection = $product->getTypeInstance(true)
                      ->getSelectionsCollection($product->getTypeInstance(true)->getOptionsIds($product), $product);

$children_ids = [];

foreach ($collection as $product) {
    $children_ids[] = $product->getId();
}

$childrenCollection = Mage::getModel('catalog/product')
                        ->getCollection()
                        ->addAttributeToFilter('entity_id', array('in' => $children_ids))
                        ->addAttributeToSelect('*')
                        ->joinField(
                            'qty',
                            'cataloginventory/stock_item',
                            'qty',
                            'product_id=entity_id',
                            '{{table}}.stock_id=1',
                            'left'
                        )
                        ->load();

$total_qty = 0;
foreach ( $childrenCollection as $product) {
    echo "Qty of the product " . $product->getID() . " is " . $product->getQty();
    $total_qty += $product->getQty();
}