S26 vs NAN HW

Hi guys please help. S26 po ng gatas ng 5 weeks old baby ko. Then we switched to NAN Optipro HW One because the doctor said that my baby might have a cow's milk allergy. Nagka ganito yung poop nya at humina sya sa pagdede. Anyone na nka experience nito? Or NAN HW din ng gatas ng baby pls give us an advice