Hello doctor, My son is 6 months old. He is on bottle feeding from birth. Similac stage 1.It is so good and he is doing well. He recently diagnosed with lactose intolerance. So doctor prescribed zerolac formula which is soya based. I am very satisfied with similac as it has all the nutrients. Is zerolac good or not? Is this temporary treatment? How many days I have to continue this formula? After that shall I switch again to similac stage 2? My son is allergic to cow milk protein. So soya protein is also equal to cow protein then is there any chance of getting allergy? please help me.