Desired fertility and achieved fertility

1. The fertility gap.
   1. How many children people say they want.
   2. How many they ultimately have.
   3. Differences by sex, age, class, and country.
   4. Voluntary childlessness versus unrealized parenthood.
2. Obstacles to desired families.
   1. Finding a partner.
   2. Timing.
   3. Money.
   4. Health and infertility.
   5. Work-family conflict.