Hi Doctor, I'm A Nanny And Take Care Of A

Hi Doctor, I'm a Nanny and take care of a three month old baby boy and whenever I give him his bottle he cries a lot like he has pain in his belly, they took him to a Gastroenterologist and he gave him a different milk based on Amino Acids. he started with Similac Alimentum. I don't know what to do. I want to know more information about Promil.