Kang Muslim
A comprehensive study published in the Journal of Personality has uncovered a consistent link between "overfulfilled" fertility goals—having more children than originally intended—and a measurable decline in life satisfaction and emotional well-being. The research, led by Laura Buchinger, a senior scientist in developmental psychology at Humboldt University of Berlin, suggests that while failing to reach a desired family size is often manageable for most adults, exceeding those self-defined boundaries carries a distinct psychological cost.
By analyzing data from nearly 24,000 individuals, the study challenges the traditional narrative that more children inherently lead to more fulfillment. Instead, the findings suggest that the alignment between personal goals and reality is the primary driver of psychological health in the context of parenthood. The research provides a nuanced look at the "fertility mismatch," a term used by scientists to describe the gap between an individual’s ideal number of children and their actual family size.
The Scope and Methodology of the German Study
To investigate the psychological ramifications of fertility mismatches, Buchinger and her team utilized data from an extensive annual survey of private households in Germany. The sample size was robust, encompassing 23,843 adults ranging in age from 18 to 100 years old. This broad age range allowed the researchers to observe how fertility desires and their subsequent fulfillment—or lack thereof—impact well-being across the entire adult lifespan.
The methodology relied on a comparison between two primary data points: the "ideal" number of children participants would have if there were no obstacles (such as financial constraints or health issues) and the actual number of biological children they had at the time of the survey. Based on this comparison, the researchers categorized the participants into five distinct groups:
- Fulfilled Parents: Those whose actual number of children matched their ideal.
- Unfulfilled Parents: Those who had children but wanted more than they currently had.
- Overfulfilled Parents: Those who had more children than they had originally desired.
- Involuntarily Childless: Individuals who wanted children but had none.
- Childfree by Choice: Individuals who intentionally chose not to have children.
To measure well-being, the scientists employed a multi-faceted approach. Participants were asked to rate their overall life satisfaction, satisfaction with family life, and satisfaction with their professional work on a scale from zero to ten. Additionally, the researchers calculated an "emotional balance score" by measuring the frequency of positive emotions (happiness) against negative emotions (anger or sadness).
The Psychological Penalty of Overfulfillment
The most striking finding of the study was the consistent negative association between overfulfillment and well-being. Parents who had more children than they had planned reported lower scores across all measured areas of satisfaction. According to the data, these individuals experienced lower overall life satisfaction, decreased family satisfaction, and a poorer emotional balance.
Buchinger noted that while the effect sizes were not "dramatic" in a way that would suggest a total collapse of well-being, they were statistically significant and meaningful in the context of daily life. "For example, parents who had more children than they ideally wanted reported about a quarter of a standard deviation lower life satisfaction on average," Buchinger explained. She characterized this difference as the gap between feeling "quite satisfied" and feeling slightly less than that.
Crucially, this negative association persisted even after the researchers controlled for external variables such as income, employment status, and relationship stability. This suggests that the psychological strain of overfulfillment is not merely a byproduct of financial stress or time poverty—though those factors certainly play a role—but is rooted in the psychological dissonance of exceeding one’s personal life goals.
The Resilience of the Childless and the Unfulfilled
In contrast to the findings regarding overfulfillment, the study offered a more optimistic view of those who fall short of their fertility goals. Interestingly, individuals who were involuntarily childless, those who were childfree by choice, and parents who simply wanted more children than they had did not show consistently lower happiness levels compared to "fulfilled" parents.
This finding contradicts a common societal assumption that childlessness, particularly when involuntary, leads to a lifetime of diminished well-being. Buchinger pointed out that once factors like income and relationship status were accounted for, not having children was not linked to lower life satisfaction. In some specific analyses, remaining childless was even associated with slightly higher levels of well-being.
"A key finding is that, for many younger and middle-aged adults, the number of children they ideally want is higher than the number they actually have," Buchinger said. The data suggests that many people are able to adapt to unfulfilled fertility desires, finding meaning and satisfaction in other areas of life such as career, hobbies, or social circles.
Age and the "Reproductive Deadline"
While the unfulfilled group generally fared well, the researchers discovered that age serves as a critical moderator. For younger adults, wanting more children was not associated with lower well-being, likely because they still perceive the goal as attainable in the future. There is a sense of "hope" or "potential" that buffers against current dissatisfaction.
However, the psychological impact shifts as individuals pass the typical reproductive age. For older adults who have reached what psychologists call a "developmental deadline," falling short of their desired number of children was more closely linked to lower life satisfaction and poorer emotional balance. The data showed that it is only among adults aged 75 and older that desired fertility tends to match achieved fertility, suggesting that people eventually adjust their "ideals" to match their reality as they age, a process known as "goal disengagement and re-engagement."
The Role of Social and Regional Context
The researchers also hypothesized that environmental factors—such as the availability of childcare, regional religious norms, and conservative family expectations—would influence how people felt about their family size. For instance, they expected that a lack of childcare would make overfulfillment more stressful, or that living in a religious area would make childlessness more psychologically difficult due to social stigma.
Surprisingly, the data provided almost no evidence for these regional effects. The quality of local childcare infrastructure and the level of regional religiosity did not significantly alter the relationship between fertility mismatch and well-being.
"That was somewhat surprising, given that earlier studies suggest these factors matter," Buchinger noted. She suggested that the lack of findings in this area might be due to limitations in how these regional factors were measured or that, in modern Germany, personal goals have become more influential than regional social pressures.
Limitations and the German Context
The researchers were careful to highlight the limitations of their study. Primarily, the data is cross-sectional, meaning it captures a snapshot of a person’s life at a single point in time. This prevents the scientists from definitively proving a causal relationship. It is possible, for instance, that people with naturally lower well-being are more likely to view their family size as a "mismatch" in retrospect.
Furthermore, the study focused exclusively on biological children, leaving out the experiences of adoptive parents, stepparents, or those in multi-generational households where caregiving roles might differ. The cultural context of Germany also plays a significant role. Germany has specific family policies, such as extensive parental leave and a history of low birth rates, which may make these findings less applicable to countries with different social safety nets or cultural attitudes toward large families.
Implications for Policy and Future Research
The study’s findings have significant implications for how society views family planning and reproductive health. The data suggests that supporting individuals in achieving their specific family goals—neither more nor less—is the most effective way to ensure long-term psychological well-being.
For policymakers, the research highlights that while increasing birth rates is a common goal in aging Western societies, pressuring individuals to have more children than they desire could have a negative impact on the overall mental health of the population.
Buchinger’s future research aims to dig deeper into these dynamics. She is currently working on a longitudinal study investigating well-being during the transition to menopause, which will help clarify how the "biological deadline" affects psychological health over time. Additionally, she plans to move beyond simple "life satisfaction" to explore "eudaimonic well-being"—the sense of meaning and purpose in life.
"I want to expand the focus… to include meaning and purpose in life, which has been far less frequently studied in this context," Buchinger said. As fertility rates continue to fluctuate across the globe, understanding the complex interplay between personal desires, biological reality, and psychological fulfillment remains a vital area of study for developmental psychologists and sociologists alike.
