dry skin

Hi! My 3 month old nephew has allergies and his allergist said to stop bathing him due to his dry skin. He said to use a moisterizing cream that also cleans. I don't think the cream really cleans him though. Does anyone have any advice how to clean him without bothering his skin?  

He has food allergies. He's allergic to milk. We stopped giving him what ever he is allergic to but it takes time to get it out of his system. He scratches himself and has peeling skin all over his head. He also cries all the time-but I don't know if that's from the allergies. A far as Johnson's, I'll tell my sister to try it. Thanx.