In this new report, @lymanstoneky @PeterRFB and @DrJasonCarroll begin the work of opening the black box of fertility culture. We explore the specific factors across and within societies that lead some people to have many more children than others. We used a survey of nearly 10,000 people spanning over a dozen countries. Most of our survey covered questions that have rarely, if ever, been surveyed cross-nationally, or have not been surveyed in a research program that also. As a result, we can present first-of-a-kind evidence on what specific. cultural norms typify successful pronatal cultures. Here are our main findings: 1. Friends and family matter to fertility intentions. 2. The family lives of celebrities (and the visibility of celebrity family lives) influence the family lives of fans. 3. Effective pronatal beliefs entail positive attitudes towards family life, but not necessarily any particular sense of obligation. 4. Division of household labor does not have a big impact on fertility. 5. Active faith matters to fertility desire and outcomes. 6. A willingness to take risks and an optimism about the future both predict intentions to have children and the number of children a respondent already has.