A Growing Number of Men May Never Become Fathers – According to New Study

The idea that women and men have roughly the same number of children seemed like common sense. After all, every child has both a mother and a father. Yet new research is challenging that assumption and revealing a surprising demographic shift: men may now be having fewer children on average than women.

At first glance, that sounds impossible. How can one group have more children than the other when every birth involves both sexes? The answer lies in changing patterns of relationships, family formation, and reproductive behavior. Researchers examining population data have found that fatherhood is becoming increasingly concentrated among a smaller share of men, while a growing number never have children at all.

A Surprising Change in Parenthood Patterns

A recent study published in the Proceedings of the National Academy of Sciences analyzed fertility patterns across multiple countries and time periods. Researchers found evidence that, in some populations, women now have slightly more children on average than men.

This difference is not because women are having larger families. Instead, it reflects how unevenly fatherhood is distributed among men. Some men have children with more than one partner, while a growing percentage have no children at all.

Historically, fertility rates between men and women appeared similar because most people married and had children within relatively stable partnerships. Today, family structures are far more diverse. Delayed marriage, lower marriage rates, relationship instability, and shifting social expectations have all contributed to a changing reproductive landscape.

The result is a population in which motherhood remains relatively common, while fatherhood is becoming less universal.

Why Some Men Are Having Fewer Children

Several factors appear to be driving this trend.

Delayed Family Formation

Many adults are postponing marriage and parenthood. Financial pressures, educational goals, housing costs, and career development often take priority during early adulthood.

Because men tend to have children later than women, these delays can have a greater impact on male fertility outcomes. Some men eventually become fathers later in life, while others never reach that milestone.

Relationship Challenges

Modern dating and partnership dynamics have changed dramatically over the last few decades. Studies suggest that a smaller proportion of men are forming long-term relationships compared to previous generations.

When stable partnerships become less common, opportunities for family formation may decline as well.

Economic Factors

Economic security remains closely tied to family planning decisions. Men facing unemployment, unstable income, or financial uncertainty may postpone or avoid having children.

Research consistently shows that financial stress can influence decisions about marriage, parenting, and household formation.

Concentrated Reproduction

Another factor involves reproductive concentration. In some populations, a smaller group of men fathers children with multiple partners. This increases the number of children associated with those men while leaving a larger proportion of other men childless.

This pattern creates a statistical imbalance even though total births remain the same.

The Health Effects of Childlessness in Men

Parenthood is not a requirement for a meaningful or healthy life. Many people live deeply fulfilling lives without children.

However, researchers have found that social connections and supportive relationships can influence both physical and mental health outcomes.

For some men, involuntary childlessness may contribute to feelings of loneliness, social isolation, depression, or reduced life satisfaction. These effects are often strongest when parenthood was a desired goal that was never achieved.

Studies have linked strong social networks with better cardiovascular health, improved immune function, and lower mortality risk. While children are only one source of social connection, family relationships often become an important part of emotional support systems later in life.

The key issue is not whether someone becomes a parent. It is whether they maintain meaningful relationships, a sense of purpose, and emotional well-being throughout adulthood.

What This Means for Society

The trend toward lower male fertility has implications that extend beyond individual families.

Population growth is slowing in many countries. Birth rates have fallen below replacement levels across much of the developed world. As fewer people have children, societies face challenges related to aging populations, workforce shortages, and increased healthcare demands.

At the same time, changing family structures may alter how caregiving responsibilities are distributed across generations.

Researchers are also paying closer attention to how social and economic inequalities influence reproductive outcomes. Men with greater financial stability, education, and relationship opportunities may be more likely to become fathers, while others face increasing barriers.

Understanding these patterns can help policymakers develop strategies that support families, strengthen communities, and improve opportunities for future generations.

Supporting Reproductive Health in a Changing World

Although demographic trends are influenced by many social factors, individual health still matters.

Male fertility has been affected by several modern lifestyle factors, including obesity, chronic stress, poor sleep, environmental exposures, smoking, and inadequate nutrition.

Research suggests that healthy lifestyle habits can support reproductive function and overall well-being.

Some practical steps include:

• Maintaining a healthy body weight
• Engaging in regular physical activity
• Prioritizing restorative sleep
• Managing chronic stress
• Avoiding tobacco products
• Limiting excessive alcohol consumption
• Eating a nutrient-rich diet focused on whole foods
• Seeking medical evaluation for fertility concerns

Even for men who are not planning to have children, these habits support cardiovascular, metabolic, and cognitive health throughout life.

My Personal RX for Men Navigating Fatherhood, Fertility, and Life Satisfaction

The findings in this study aren’t really about who is having more children—they’re about the growing number of men who may never become fathers, whether by choice or circumstance. While many factors that influence parenthood are outside your control, there are important steps you can take to support your reproductive health, strengthen your relationships, and build a fulfilling life regardless of your family status.

Here are my personal recommendations:

1. Don’t wait until you’re ready for children to think about fertility: Many men assume fertility remains unchanged throughout adulthood, but age, lifestyle habits, obesity, smoking, poor sleep, and environmental exposures can all affect reproductive health. If fatherhood is important to you, start protecting your fertility now rather than years down the road.
   
2. Prioritize hormone health: Testosterone plays a role in fertility, energy, mood, muscle mass, and overall well-being. Chronic stress, poor sleep, excess body fat, and inactivity can negatively affect hormone balance. Regular exercise, quality sleep, and a nutrient-dense diet can help support healthy levels.
   
3. Build strong relationships before you need them: One of the biggest takeaways from this research is that social connection matters. Whether you’re married, dating, single, or child-free, invest in meaningful friendships, family relationships, and community involvement. Strong social bonds are linked to better mental and physical health throughout life.
   
4. Address stress and loneliness early: Men are often less likely to seek support when struggling emotionally. If feelings of isolation, anxiety, or disappointment are affecting your quality of life, talk with a trusted friend, counselor, or healthcare professional. Mental health is health.
   
5. Maintain a healthy weight: Excess body fat has been associated with reduced fertility, lower testosterone levels, and increased risk for chronic disease. Focus on sustainable habits rather than quick fixes—small improvements made consistently often produce the best long-term results.
   
6. Protect your sleep like a health asset: Men who consistently get inadequate sleep may experience disruptions in hormone production, mood regulation, and overall health. Aim for seven to nine hours of restorative sleep each night.
   
7. Learn to calm chronic stress: Financial pressures, career demands, relationship challenges, and uncertainty about the future can all take a toll on health. The strategies in Calm the Chaos can help you develop practical tools for managing stress and improving resilience.
   
8. Remember that fatherhood is only one measure of a life well lived: This study highlights changing demographic trends, but your value is not determined by whether you have children. Purpose, meaningful relationships, personal growth, service to others, and good health are equally important foundations for a fulfilling life.

Sources:

1. Arnocky, S., Uggla, C., & colleagues. (2025). Sex differences in fertility rates in contemporary populations. Proceedings of the National Academy of Sciences, 122(24). https://doi.org/10.1073/pnas.2533317123
2. Leslie, T. (2026, May). For The First Time, Men May Be Having Fewer Children On Average Than Women. IFLScience.
3. ‌Men have fewer children than women. (2026). Www.mpg.de. https://www.mpg.de/26423948/men-have-fewer-children-than-women