The notion that COVID-19 vaccinations are responsible for a decline in childbirth is not supported by recent research conducted at Linköping University in Sweden. This study debunks widespread rumors linking vaccination to reduced fertility rates, and its findings were published in the journal Communications Medicine.
"Our conclusion indicates that the mRNA vaccine for COVID-19 is unlikely to have contributed to the observed decrease in births during the pandemic," explains Toomas Timpka, a professor specializing in social medicine at Linköping University.
The research team was motivated to explore this issue due to the rampant misinformation circulating on platforms like social media, suggesting that receiving the vaccine could hinder one’s ability to conceive. Throughout the latter stages of the pandemic, some nations, Sweden included, experienced a noticeable drop in the birth rate, prompting concerns about whether this decline might be linked to the newly introduced vaccines.
In their study, the researchers focused on women aged 18 to 45 in Region Jönköping County, analyzing data from nearly 60,000 individuals within a broader population of 369,000. Notably, 75% of these women had received one or more doses of a COVID-19 vaccine between 2021 and 2024. By examining healthcare records, they gathered comprehensive information on childbirths, vaccination statuses, miscarriages, and mortality rates.
Upon comparing the outcomes of childbirth and miscarriage rates among vaccinated and unvaccinated women, no significant statistical differences were detected. This finding aligns with previous studies that also found no correlation between COVID vaccinations and fertility issues.
"We observe no notable differences in childbirth rates between vaccinated individuals and those who chose not to receive the vaccine. Additionally, our analysis of registered miscarriages among those who did conceive shows similar results across both groups," Timpka noted.
The researchers propose that the observed decline in childbirth rates could be attributed to alternative factors rather than vaccinations. For instance, individuals currently in their 30s—an age group typically associated with parenthood—were born during the latter half of the 1990s, a period marked by economic challenges and a subsequent drop in birth rates in Sweden. Therefore, the pool of potential parents has diminished as a result of lower birth rates from three decades ago. Furthermore, various pandemic-related influences, such as health anxieties, economic uncertainties, and altered behaviors during lockdowns, may also have contributed to the decline in childbirth.
One of the strengths of this study lies in its analysis of pregnancy outcomes within a large and representative sample of the population. The researchers acknowledged that a woman’s age could potentially obscure any effects that the vaccines might have on childbirth. Consequently, they adjusted for age in their analytical approach.
This important study was financially supported by several organizations, including the Swedish Research Council.
