The purpose of the study is to identify the factors that influence the reproductive behavior of young Russian families (heterosexual families consisting of two persons below the age of 35 with or without children). The analysis relies on the results of a mass questionnaire survey of young first-time married people (n = 893) conducted in 10 Russian regions in 2019-2020, in-depth interviews with young married people (n = 50) and an expert survey of managers and specialists working for social non-profits (n = 10), both conducted in 2021. Based on the data of the mass survey, we found that there are differences in the values of young families with children and without children. Moreover, young couples may choose to postpone childbearing not only for financial reasons but also because of their marital attitudes and reproductive strategies formed in the process of socialization. Marital behavior has a great influence on reproductive behavior. The differences in the respondents’ attitudes to parenthood are determined by their gender roles, experience of having and raising children or absence of such experience. We found that state social support does not have a significant impact on the reproductive behavior of young families in Russia. Expert assessments show that the current measures of social support for young families do not cover all the needs of these families and that there is a perceived need for a more comprehensive assistance model.