According to data published by various demographic organizations, fertility rates are decreasing in many countries around the world, including Iran. This can be due to a number of reasons. However, cultural transformations over the past few decades, among other changes, are the most self-explanatory. The growth of individualism and humanist thoughts, changes in beliefs and attitudes, the growth of secularism, changes in family values and transformation are among the most important developments related to fertility. The aim of this study was to study the factors affecting fertility in individual, familial and social domains and to explain a model for family in fertility based on valid evidence and relying on religious teachings. Brinasas, the research method in this study, is qualitative and meta-analysis. The results showed that there is a significant relationship between individualism, modernization, religiosity, secularism and family values in families and fertility, meaning that the more commitment to family religious beliefs, the lower the levels of secularism and individualism, and the higher the attention to family values, the higher the fertility rate in those families. In the meantime, modernization and its impacts on the family, especially women, have contributed greatly to changing attitudes. Therefore, the most important principle is changes in attitude, belief, value and action in three levels of individual, family and society. Attitudes are formed over time and a transformational process, and then they are transformed into beliefs and values and eventually into action, and when they are formed, it is simply not possible to change them, so effective measures should be taken in this regard.