Having children is one of the most important demographic components that plays a decisive role in the economic and social development of societies (
1). Iran's significant fertility decline, exceeding 50%, stands out among Muslim nations and other countries (
2). This decline in fertility poses challenges such as a shrinking labor force and an aging population, with adverse effects on investment and the economy (
3). Decisions and behaviors related to fertility are strongly influenced by individuals' attitudes towards and desires for childbearing (
4). Numerous studies have indicated that couples' reproductive intentions and desires are influenced by various biological, psychological, and social factors, including infertility, timing of marriage, family's socio-economic status, employment, and women's educational attainment (
5). Couples' values and perspectives on childbearing, marital interactions, government support, social norms, and the influence of social networks can all impact their reproductive attitudes and behaviors (
6). Studies have highlighted the significant impact of couples' health on their intention to have children (
7). Today, the concept of health encompasses a broader perspective, with increasing attention being paid to the social determinants of health, which greatly influence individuals' health status either independently or through interrelated influences (
8). The social determinants of health refer to the conditions in which people are born, grow, live, and work. The conceptual framework provided by the Commission on Social Determinants of Health (CSDH) of the World Health Organization (WHO) categorizes these factors into two groups (
Figure 1) (
9). The first group consists of the structural social determinants of health, such as education, income, gender, and ethnicity (race). These factors contribute to the creation of social class and have a significant impact on health outcomes. The second group comprises the intermediate social determinants of health, which indicate that the effects of structural determinants are not direct but work through these intermediate determinants. Intermediate determinants include living conditions, working conditions, psychosocial factors, behavioral factors, and social support (
8,
9). The socio-economic index consists of three factors, namely education, occupation, and income. This determinant can directly and indirectly affect people's well-being and health by providing vital skills and knowledge (
10). According to the study conducted by Lam, changes in the position of women through employment, higher education, participation in family decision-making, and participation in social activities can significantly reduce the fertility rate (
11). By contrast, another study found that German men and women with higher levels of education tended to have more children (
12). Régnier-Loilier et al. found that women with higher education had more self-confidence and self-efficacy, which consequently enabled them to better cope with external pressures and take on the parental role (
13). Stress, depression, and anxiety are among the psychological factors that influence overall well-being as mediating determinants of health (
9). The increased number of children leads to heightened mental and psychological pressure, giving rise to a concept known as the hypothesis of maternal role incompatibility or work-family conflict, as described by some sociologists (
14). Conflicting roles, multiple responsibilities, and added pressure associated with motherhood can place working women in a challenging position, potentially leading to psychological disorders such as anxiety, fatigue, depression, and negative attitudes towards childbearing. By contrast, women who only assume traditional roles may have a more favorable mental health status (
15). Another psychological factor related to the determinants of health is the fear of childbirth. Pregnancy is a significant change in a woman's life and brings with it the new responsibility of child care, which can lead to emotional conflict. Some women experience increased anxiety and develop a fear of childbirth caused by these changes (
16). Taheri et al. identified fear of childbirth pain and potential harm to the fetus as the most prevalent causes of fear and anxiety among expectant mothers (
17). Social support plays a critical role as a mediating factor in health. It encompasses love, companionship, care, respect, attention, and support that individuals receive from family members, friends, and significant others (
18). In their study, Dehle and Landers found a positive and significant relationship between social support, particularly from family members, and mental health (
19). Individuals who perceive high levels of support from parents, relatives, and friends are more likely to want to have children and to fulfill their intentions (
20). In contrast, some studies have shown that the supportive role of the family may not have a significant effect on couples' fertility intentions and may even have the opposite effect (
21,
22). Many studies have recognized the mediating role of social support in this context (
23). Marital compatibility is another important factor in mental health and well-being. It provides the basis for several important decisions in a couple's relationship, including the decision and inclination to have children (
24). In other words, higher levels of marital compatibility have been found to positively influence the transition from childlessness or having one child and make women hold positive attitudes towards childbearing (
25). Considering that the process of fertility transition and the significant fertility decline in Iran involve multiple factors, it is important to understand that attitudes towards childbearing are influenced by various social determinants of health. A deep understanding of these determinants can help reproductive health counselors provide more appropriate recommendations and methods to couples. By providing and improving the overall health of society, they can help promote positive attitudes towards childbearing among women.