Fertility Decline and Smaller Families Reshape Switzerland’s Future

Switzerland is experiencing a continued decline in birth rates and marriages, reinforcing long-term demographic changes that are reshaping the country’s population structure.

According to the Federal Statistical Office, 78,200 children were born in Switzerland in 2025, marking a slight decrease from the previous year and the fourth consecutive annual decline. Although the drop appears small, it confirms a steady downward trend over the past decade.

Over the last ten years, the number of births in Switzerland has fallen by nearly 10%, while fertility rates have dropped more sharply from 1.54 to 1.28 children per woman. These figures remain well below the replacement level needed for long-term population stability.

Delayed Parenthood and Fewer Children

The decline is largely driven by two key patterns: fewer people choosing to become parents, and those who do increasingly limiting family size to one or two children.

Births among women under 35 have fallen significantly, while births among women aged 35 and above have increased. This shift has pushed the average age of motherhood in Switzerland to 32.5 years.

Experts note that delayed parenthood reduces the total number of childbearing years, increasing the likelihood that some people will have fewer children than originally planned.

At the same time, surveys show changing attitudes toward parenthood. A growing share of young adults now express no desire to have children, particularly in urban areas and among highly educated women.

Stable Deaths but Slowing Growth

Deaths in Switzerland remained broadly stable at around 71,900 in 2025. As a result, the country still recorded a natural population increase of about 6,300 people.

However, this surplus has declined sharply compared to previous years, reflecting a long-term weakening of natural population growth. In 2016, for example, the surplus was nearly four times higher.

Demographers warn that if current trends continue, Switzerland could see natural population growth stall by the mid-2030s. Without immigration, population decline could follow as deaths begin to exceed births.

Marriage and Divorce Trends

Marriage rates are also falling. Around 35,900 couples married in 2025, representing a 2.3% decline compared to the previous year. This marks the third consecutive annual drop.

The total includes approximately 800 same-sex marriages, following the introduction of marriage equality in 2022. However, the initial increase in weddings after the reform appears to have stabilized.

Divorces also declined slightly, with Swiss courts recording around 15,800 cases in 2025. Despite this drop, long-term projections suggest that nearly 40% of marriages could eventually end in divorce if current trends continue.

Long-Term Economic Impact

The combination of lower fertility, delayed family formation, and an ageing population presents significant long-term challenges for Switzerland.

Fewer working-age people will eventually need to support a growing elderly population, increasing pressure on pension systems, healthcare services, and public finances.

Policymakers increasingly view demographic change as one of the most important structural challenges facing Switzerland in the coming decades.

Sperm Quality in Swiss Recruits Remains Stable, Study Shows.

A new scientific study has found that sperm quality among young Swiss men has remained stable over recent years, contrasting with global reports of declining male fertility indicators.

The research was conducted by the University of Zurich and the Zurich University Hospital and published in the journal New Microbes and New Infections. It compared data from 194 Swiss army recruits examined in 2021 with findings from 2,523 young men tested between 2005 and 2017.

Researchers evaluated key indicators of reproductive health, including semen volume, total sperm count, sperm concentration, and sperm motility. The results showed that these measurements have remained relatively consistent over time, suggesting no further decline in sperm quality among the study groups.

According to the study, 41% of men tested in 2021 had at least one sperm parameter below World Health Organisation reference standards. In the earlier dataset, this figure was significantly higher at 62%, indicating an apparent improvement.

However, researchers caution that the results should be interpreted carefully. They note that differences in participant selection may have influenced the findings, meaning the apparent stability or improvement could partly reflect sampling bias rather than a true population-wide trend.

Despite these limitations, the study provides important insight into reproductive health trends in Switzerland and contributes to the ongoing global discussion about potential changes in male fertility. Scientists emphasize the need for further long-term research to confirm whether sperm quality trends are truly stable.

Cannabis and Testosterone: What a New Study Reveals.

A new Swiss study suggests that cannabis use may be linked to higher testosterone levels in young men, challenging earlier assumptions that the substance lowers male hormone levels.

Study Overview

Researchers from the University of Geneva analyzed blood samples from 94 Swiss military recruits aged between 18 and 23. The participants were divided into two groups: 47 cannabis users and 47 non-users.

The findings showed that testosterone levels were approximately 23% higher in the cannabis-using group compared to non-users.

Biological Mechanism

According to researchers, the increase in testosterone appears to originate in the testicles, specifically in the Leydig cells, which are responsible for producing male sex hormones. The adrenal glands, however, showed no significant change in hormone production.

This suggests that cannabis may have a direct biological effect on testosterone production mechanisms in the male reproductive system.

No Direct Link to Fertility

Despite the increase in testosterone levels, researchers caution against interpreting the results as improved fertility. The relationship between testosterone and reproductive health is complex and cannot be measured by hormone levels alone.

Scientists propose that the increase may be a compensatory response to reduced sensitivity in hormone receptors. Another possibility is that individuals with naturally higher testosterone levels may be more likely to engage in risk-taking behaviors, including cannabis use.

Wider Scientific Context

The study aligns with earlier research from Denmark and the United States, which also observed a correlation between cannabis use and increased testosterone levels. However, earlier smaller studies had produced mixed or contradictory findings.

Conclusion

Researchers emphasize that while cannabis appears to influence hormone levels, its long-term effects on fertility and reproductive health remain unclear. Further large-scale studies are needed to understand the full clinical implications.