In the not so distant future, parents can select the best attributes their child will have.  You and your wife decide to have a child - you go and get your DNA mixed, you remove all of the bad traits like poor eyesight, short height, autism, heart disease propensity, etc and you wind up with your perfect child, 10 fingers, 10 toes, 180 IQ, the heart of a racehorse, etc.  These children are the best that humanity can be and the best that two parents can produce.  In the future upper middle class children and upper class children are almost entirely conceived in this engineered fashion and although discrimination based on eugenics is illegal, it is commonly practiced in this future with those who are not born in the genetically engineered fashion being relegated to inferior jobs.