At the moment, our knowledge of the humane genome would not be at the stage where we would be able to quantify the risk for each and every child. Maybe one day it will be in this state.
However, there are family histories that are indicative that lack of BF may be more risky for some than others.
I think in Harmony's case, she has summed it up nicely. For myself, with my eczema, allergies, and so on, and my husband's asthma I also felt that BF was particularly important for all my children.
I think their are other family histories where it would also be important. Celiac disease, diabetes, high cholesterol later in life and so on would be things that come to my mind. I know these would also be affected by later diet, but I think laying a good foundation would be extra important. Anything that runs in families and also seems to have increased risks with FF.
Maybe we will find out other things where not BF also increases the risk of illness. Again that would be important if there is a family history. But even without a family history, there are all sorts of things like infectious diseases where BF is important. I don't think that will ever be predictable, even if we can map everyone's genome in the future.
Teresa