COVID-19 Pandemic Effects on Population Dynamics: Migration, Mortality, and Fertility Trends

The COVID-19 pandemic did more than overwhelm hospitals and disrupt daily life – it reshaped the very foundations of population dynamics. From halting international migration to depressing birth rates and raising mortality figures, the pandemic’s demographic footprint is among the most significant in modern history. Understanding these shifts in migration, mortality, and fertility is essential for grasping how populations around the world have been – and continue to be – transformed.

COVID-19’s multifaceted demographic impact 🔗

Population change is driven by three core components: births, deaths, and migration. COVID-19 disrupted all three simultaneously, creating a demographic shock comparable to major historical crises. According to research published in Nature Communications, if the pandemic had not occurred, the United States alone would have had an estimated 2.1 million more people by 2025. Notably, pandemic-driven migration changes were projected to have a larger long-term effect on population size than mortality itself, despite the two having comparable short-term impacts.

This kind of combined disruption is not unprecedented. Historical parallels include the 1918 influenza pandemic, which caused a 13% drop in birth rates in the United States between 1918 and 1919, as documented in the journal Science. The 2015 Zika outbreak in Brazil also led to deliberate pregnancy avoidance due to health risks to the unborn child. What made COVID-19 different was the sheer scale and simultaneity of its effects across nearly every country on the planet.

How travel restrictions reshaped migration 🔗

International migration, a key driver of population growth in ageing societies, took a sharp hit during the pandemic. Governments around the world imposed border closures, travel bans, and quarantine requirements. Many migrant workers were forced to return to their countries of origin due to job losses and higher infection risks in overcrowded living conditions.

A study published in PMC (National Library of Medicine) quantified immigration declines across 15 high-income countries. The findings revealed that Australia experienced a 60% decline in immigration, Spain saw a 45% drop, and Sweden recorded a 36% reduction. Several other countries saw declines between 15% and 30%. These are significant numbers, especially for nations where net migration gains have long been essential for offsetting low birth rates and sustaining labour forces.

In the United States, the pandemic disrupted nearly every aspect of the immigration system. According to analysis from the Penn Wharton Budget Model, the sharp fall in noncitizens coming to live in the country was one of the pandemic’s most consequential demographic effects. Combined with reduced fertility and excess deaths, the pandemic reduced the long-term U.S. population by an estimated 0.5 percent.

Mortality: the pandemic’s most visible toll 🔗

The most direct and visible demographic consequence of COVID-19 was, of course, the rise in mortality. Globally, the pandemic led to millions of excess deaths. In the U.S. alone, at least 1.4 million additional deaths were recorded during 2020, 2021, and 2022. COVID-19 mortality was heavily concentrated among older adults – residents of long-term care facilities, who made up less than 1% of the population, accounted for over 40% of deaths in the pandemic’s early months, as reported by RAND Corporation.

The worst-affected regions of northern Italy recorded losses in period life expectancy of 2 to 3.5 years for men and 1.1 to 2.5 years for women – the largest decline since the 1918 influenza pandemic and World War II. The distribution of deaths was also deeply unequal. In the U.S., Hispanic and non-Hispanic Black populations experienced disproportionately higher death rates, revealing how pre-existing health disparities were amplified by the pandemic.

Uncertainty and fear: the first driver of fertility decline 🔗

While mortality grabbed headlines, the pandemic’s impact on fertility was equally significant for long-term population trends. The first major channel through which COVID-19 suppressed birth rates was widespread uncertainty and fear.

The highly contagious nature of the virus, high mortality rates, and the initial absence of vaccines created profound anxiety about the future. Lockdowns of uncertain duration and severity compounded this anxiety. Surveys conducted during the pandemic identified increased levels of pregnancy-related concern among prospective parents. Many couples decided to delay childbearing, unsure of when – or whether – conditions would improve. Research published in Population and Development Review found that, across 38 higher-income countries, the pandemic combined different types of shocks – health-related fear, social isolation, restricted access to grandparents for childcare, and reduced sexual activity – all of which jointly pushed fertility downward.

This pattern of short-term fertility decline following a crisis is consistent with historical trends. During and after major shocks like wars, famines, and epidemics, birth rates typically drop in the short term before gradually recovering. However, unlike the 1918 pandemic, COVID-19 primarily affected older adults rather than those of reproductive age – meaning the fertility decline was driven more by behavioural choices than by direct mortality of potential parents.

Economic disruption: the second blow to fertility 🔗

The pandemic’s second major impact on fertility came through a severe global economic crisis. The World Bank described the downturn as the worst recession since World War II. Global GDP contracted sharply in 2020 – with estimates ranging from 3.4% to 5.2% depending on the methodology used – far exceeding the contraction during the 2009 Great Recession. Advanced economies alone were anticipated to shrink by about 7%, while emerging and developing economies contracted by approximately 2.5%.

The economic fallout was massive. The International Labour Organization reported that 8.8% of global working hours were lost in 2020, equivalent to 255 million full-time jobs. Unemployment surged, incomes fell, and millions of people were pushed into extreme poverty. For many couples, the financial instability made starting or expanding a family seem irresponsible or simply unaffordable.

The link between economic downturns and declining fertility is well established in demographic research. When people face job losses, reduced incomes, and an uncertain economic outlook, they tend to postpone major life decisions – including having children. The COVID-19 recession amplified this tendency to an unprecedented degree because it combined economic hardship with a simultaneous health crisis and social isolation.

Reproductive health service disruptions in developing nations 🔗

The third significant factor shaping fertility during the pandemic was the disruption of family planning and reproductive health services, particularly in low- and middle-income countries. As health systems redirected resources toward COVID-19 response, access to contraception and maternal health care suffered dramatically.

According to UNFPA (the UN sexual and reproductive health agency), nearly 12 million women in 115 countries lost access to family planning services during the pandemic, resulting in an estimated 1.4 million unintended pregnancies. Early projections had warned that a three-month lockdown could leave between 13 and 44 million women unable to access contraception, depending on the severity of disruptions.

The causes of these disruptions were multiple: supply chain breakdowns limited the availability of contraceptive commodities; health facilities closed or diverted staff to COVID-19 duties; movement restrictions prevented women from reaching clinics; and fear of infection discouraged facility visits. A study published in PMC examining trends in Senegal found a significant but short-lived disruption in new family planning users during the immediate lockdown period in March 2020.

Research from the WHO’s multi-country study in India, Nigeria, and Tanzania confirmed that the main drivers of disruption included patients not presenting to outpatient care (76% of cases), transport lockdowns hindering access (48%), and financial difficulties (33%). These disruptions disproportionately affected the most vulnerable populations – women in rural areas, those with lower incomes, and those reliant on public health facilities.

Many countries responded by designating reproductive health services as essential. International organisations like UNFPA worked with governments and civil society to mitigate the worst impacts, and contraceptive supply chains largely bounced back from early stock-outs. However, for women who experienced unintended pregnancies during those months of disrupted access, the consequences were long-lasting.

Country-specific policy responses 🔗

Nations did not respond to these demographic challenges uniformly. As the UN World Population Policies 2021 report documented, government approaches varied significantly depending on their existing fertility levels and demographic concerns.

High-fertility countries: maintaining family planning 🔗

Countries with persistently high birth rates continued to prioritise family planning programmes. Kenya stands out as a notable example. It was the first country in sub-Saharan Africa to adopt a national family planning programme back in 1967. Over the following decades, this programme helped bring the country’s fertility rate down from 8.1 births per woman during 1965-1970 to 3.5 births per woman during 2015-2020. Despite the pandemic’s disruptions, Kenya and similar high-fertility nations understood that maintaining access to reproductive health services was essential to sustaining their demographic progress.

Low-fertility countries: pronatalist policies 🔗

Hungary represents the opposite end of the policy spectrum. With fertility rates that have been below replacement level since the 1960s – hovering around 1.5 births per woman in recent years – the Hungarian government has pursued aggressive pronatalist policies since the late 1940s, with renewed vigour under Prime Minister Viktor Orbán since 2010. These policies include interest-free loans to married couples that are forgiven if they have at least three children, lifetime income tax exemptions for mothers of multiple children, and car purchase subsidies for large families. Hungary now spends approximately 5-6% of its GDP on family-related support measures.

However, the effectiveness of these policies remains debated. Demographic researchers at the Vienna Institute of Demography have argued that much of Hungary’s apparent fertility increase from a TFR of 1.25 in 2010 to 1.59 in 2021 was driven by changes in the timing of births rather than a genuine increase in the number of children women have over their lifetimes.

Family-supportive rather than population-focused approaches 🔗

Australia adopted a different strategy altogether. Rather than implementing explicitly pronatalist measures aimed at boosting birth rates, Australia focused on family-supportive policies – parental leave, childcare subsidies, and workplace flexibility. This distinction is significant: the goal was to support families in making their own reproductive choices rather than incentivising a specific number of births. Australia’s demographic challenge during COVID-19 was primarily migration-related, since the country’s low case counts meant mortality did not significantly affect fertility trends.

Long-term implications for population structure 🔗

The combined demographic effects of COVID-19 – reduced migration, elevated mortality, and suppressed fertility – carry implications that will unfold over decades. Lower fertility rates coupled with reduced international migration could accelerate population ageing, even as the mortality spike among older adults temporarily reduced the elderly share of the population.

Over the long run, these shifts affect the available workforce, economic growth, consumption patterns, and the sustainability of social security systems. Fewer births today mean fewer workers entering the labour force 20 years from now. Reduced migration compounds this problem in countries that have historically relied on immigrant labour to fill gaps created by low domestic fertility.

Whether these trends will bounce back to pre-pandemic levels remains uncertain. Some indicators – like the rebound in births observed in the U.S. in 2021 after the initial 2020 decline – suggest partial recovery. But the pandemic may also have accelerated pre-existing trends toward smaller families and later parenthood that were already well underway in much of the world.

What do you think? Has the pandemic permanently altered how people think about family planning and having children, or will birth rates eventually recover to pre-COVID levels? And should governments focus on pronatalist incentives, family-supportive policies, or managed immigration to address population ageing – or some combination of all three?

References

1. https://www.nature.com/articles/s41467-024-46582-4
2. https://www.science.org/doi/10.1126/science.abc9520
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC9851539/
4. https://budgetmodel.wharton.upenn.edu/issues/2024/10/16/long-run-impact-of-covid-19-on-us-population
5. https://www.rand.org/pubs/commentary/2021/04/an-early-look-at-the-impact-of-the-covid-19-pandemic.html
6. https://onlinelibrary.wiley.com/doi/10.1111/padr.12544
7. https://www.worldbank.org/en/news/press-release/2020/06/08/covid-19-to-plunge-global-economy-into-worst-recession-since-world-war-ii
8. https://www.unfpa.org/press/new-unfpa-data-reveals-nearly-12-million-women-lost-access-contraception-due-disruptions
9. https://pmc.ncbi.nlm.nih.gov/articles/PMC9115390/
10. https://www.i-jmr.org/2025/1/e59874
11. https://desapublications.un.org/publications/world-population-policies-2021-policies-related-fertility
12. https://www.niussp.org/fertility-and-reproduction/evaluating-pronatalist-policies-with-tfr-brings-misleading-conclusions-examples-fromhungary/