My baby is now 5mths old and only had a rash on his face when he was 3mths old , I was told by gp he has eczema, after trying out different cream & lotion but nothing seems to work ease it and the rash has now spread to his body, but it will go away or move in different areas on his body. Gp now suspect he s allergic to the formula, hes s put him on soy milk but I research it that if the baby s allergic to cow s milk he ll be the same on soy milk? Then I won t know if it is formula causing it, also can you tell me if the soy milk works how soon do I see the effect?