Irregular control of population growth sometimes leads the country to a serious challenge. This problem has been obvious in our current society since recent decades so that Supreme Leader considers it as a kind of threat in his speech. Is childbearing a nature pertinence of matrimony or something following that? The main question in this study organizes the article. The author in this bibliotheca article which is written by analytical-descriptive method believes that childbearing is beyond the nature pertinence of matrimony or something following that hence, one of the solutions for this challenge is that parents converse childbearing and the number of children after matrimony to a legal obligation by an espousal addition condition. In order to gain this purpose, simplifying marriage and expression and promoting religious training and obtaining life facilities are inevitable.