I know this is a far shoot but have any of you not been able to breast feed there babies?. When my…

I know this is a far shoot but have any of you not been able to breast feed there babies?. When my baby was born I gave her breast milk for a month and she got very sick. Then I found out she had a genetic mutation to where she was allergic to cows milk and even breast milk because of the sugars. Ever since I give her soy. Anyone else encounter that problem?