The income group in the U.S. who has the most children per person are the ones in the top 1.3% of the population for incomes. They average slightly more than three children per family. These are people who were born in rich families or who made it into wealth comparatively soon in their lives. They can afford childcare, larger homes, and help with household chores, making it easier to have and raise multiple children, and they can afford things like fertility treatments and can afford to adopt children. The people who have the least children per family are those from working-class or middle-class families who spend all their time up into middle age studying at college, graduate schools, or professional schools and then have to work at their jobs as doctors, lawyers, businessmen, professors, or whatever before they reach a point where they are sure they can be sure that they will stay in those jobs. They average less than two children per family.