question: i feed my baby S26 SMA Gold for her fisrt milk but i change her milk after 10 days because her popo was so hard.i change her milk into NAN but my baby experiencing every time she drink her milk after 1 hour she will popo and so soft and smelly then she also vomit the milk...why my baby experiencing like this?it is normal to happen if changing the milk?can you suggest good brand of milk for infant?thank you...