One of the issues which has drawn attention in these years, is tending to less childbearing. Consequently, the fertility rate decrease in cities is remarkable. The goal of this study is to explore demographic, sociocultural, and economic factors which are related to "tend to wanting fewer children" in Tehran city. Data were collected by a survey method in fall, 2013. Samples were 406 married women, who were 15-49 years old, and they resided in Tehran city. The factors which have a significant relation with tendency to fewer childbearing have been found. They are demographic factors: older age at first marriage of wives and husbands; social factors: women's education level, norms of having few children, individualism, and inability to create a harmony among housework, parenting, and occupation; and economic factors: lack of sufficient income, job insecurity, the country's economic instability, and inability to provide a residence. Regression analysis shows that in one hand the number of survived children increases the tendency to childbearing, and on the other hand importance to individual freedoms, and independence decrease the tendency to childbearing. In addition, inability to incorporate housework and parenting, and also lack of coordination between parenting and occupation or education decrease the tendency to childbearing, as well. As a result, it can be said that fertility is based on benefits and social costs of childbearing.