How to get configurable products childrens custom attributes in magento

If you get configurable products children custom attributes in Magento. then provided below code put that Code as per your requirements.

$_product = Mage::getModel('catalog/product')->load(108);//categoty id
 $conf = Mage::getModel('catalog/product_type_configurable')->setProduct($_product);
 $col = $conf->getUsedProductCollection()->addAttributeToSelect('*')->addFilterByRequiredOptions();
 foreach($col as $simple_product){
     var_dump($simple_product->getId());
 }