Hello doc. My son is 4 yeras old and very allergic in nature. He has milk allergy so our doc told us not to use any milk or related products that contains lactose but can use soy milk as it not contains lactose. Now we are using  it at evening with cornflakes. But recently I have heard that long term use of soy formula milk can effect child's growth and brain development. Is it right?? We have used it for last 2 to 3 years. Should we stop it? Please help!! If it's unsafe then is there any other lactose free milk option for my toddler? We have use ISOMIL as soy formula milk. Thanks you in advance for your help.