It already exists...
It's called a Human Mother's Breast. While not always perfect, rather than CREATE problems, which transgenics have since they dropped the first "Round-Up Ready" seed into the ground in the 90's, they contain a cocktail of vitamins, nutrition, protein chains and immune markers genetically tailored for the infant human in question.
It seems we think we can always "one-up" Nature, even after over twenty years of evidence to the contrary.
So...do these Trans-Human cows have "souls"? I can't wait to hear the moshing over THAT one.