The majority of women have not been breast feed by their mothers, they have been exposed to antibiotics and to contraceptives from an early age on and to the new, modern processed foods.  As a results these women, and once they get pregnant, also their baby, have deeply abnormal gut floras according to the findings of Dr. Campbell-McBride.  She states that autism is related to an abnormal gut flora which is related to a low immunity in the embryo.  After the baby is born, vaccinations further attack the already compromised immune system.  In addition, children are exposed to antibiotics from an early age on.  Antibiotics, wipe out all the beneficial bacteria in the gut, leaving the pathogens behind.  These pathogens damage the gut lining which decreases the absorption of vital nutrients from the food.  Nutritional deficiencies can occur.  The leaking of the gut lining leads to food being digested by pathogens which creates toxic substances that are absorbed by the blood stream and once reaching the brain lead to the development of autism.  This shows us how important a healthy gut flora is to prevent autism in our children.