"Perhaps unexpectedly, babies born to the richest 20 percent of families are the least healthy, the study finds. They are more likely to be born premature and at a low birth weight, two key risk factors for medical complications early in life. This is because their mothers are more likely to be older and to have twins (which are more common with the use of fertility treatments), the researchers found."
An analysis of two million births in California, the first research of its size to include both race and income, shows the best medical care for mothers and babies is not equally accessible to everyone.