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Published: February 7, 2026
LINKÖPING, SWEDEN — A comprehensive study of nearly 60,000 women has provided the most definitive evidence to date debunking long-standing concerns regarding COVID-19 vaccinations and reproductive health. Researchers at Linköping University found no statistical link between mRNA vaccination and decreased childbirth rates or increased miscarriage risks, addressing a wave of vaccine hesitancy that has persisted since the height of the pandemic.
The peer-reviewed findings, published in the journal Communications Medicine, arrive at a critical juncture for public health. While global birth rates saw a slight decline in several nations during the later stages of the pandemic, this large-scale analysis suggests the causes are rooted in socio-economic shifts rather than biological impacts of the vaccine.
Addressing the “Fertility Myth”
Since the rollout of the first mRNA vaccines, social media platforms have been a breeding ground for unfounded claims suggesting that the spike proteins produced by the vaccine could interfere with placental development. Despite repeated assurances from the CDC and the World Health Organization (WHO), these “fertility myths” have remained a primary driver for vaccine refusal among women of childbearing age.
To settle the debate, Swedish researchers tracked a cohort of 59,51 Swedish women aged 18 to 45 between 2021 and 2024. Of this group, 75% had received at least one dose of a COVID-19 vaccine. By cross-referencing high-quality national health records—including vaccination dates, childbirths, miscarriages, and pre-existing health conditions—the team was able to isolate the vaccine’s effect from other variables.
“Our conclusion is that it’s highly unlikely that the mRNA vaccine against Covid-19 was behind the decrease in childbirth during the pandemic,” stated Toomas Timpka, Professor of Social Medicine at Linköping University and the study’s lead author.
The Data: No Gap Between Groups
The study’s methodology was particularly rigorous because it moved beyond clinical settings. While previous research often focused on “convenience samples”—such as women already undergoing In-Vitro Fertilization (IVF) treatment—this study looked at the general population.
Key Statistical Findings:
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Childbirth Rates: There was no statistically significant difference in the number of children born to vaccinated versus unvaccinated women.
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Pregnancy Loss: The incidence of registered miscarriages remained consistent across both groups, regardless of vaccination status or the number of doses received.
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Adjustment for Variables: Researchers adjusted for age, smoking status, and underlying illnesses, ensuring that the “healthy vaccinee effect” (the tendency for healthier people to seek vaccination) did not skew the results.
“We see no difference in childbirth rates between those who have taken the vaccine and those who haven’t,” Timpka noted. “We’ve also looked at all registered miscarriages among those who became pregnant, and we see no difference between the groups there either.”
Expert Perspectives: Why Birth Rates Actually Fell
If the vaccine isn’t the culprit, why did countries like Sweden and the United States see a dip in births during 2022 and 2023? Independent experts suggest the answer is behavioral, not biological.
“During periods of global instability, economic uncertainty, and public health crises, it is a documented historical trend for families to delay conception,” says Dr. Sarah Jenkins, an obstetrician not involved in the Swedish study. “The ‘wait-and-see’ approach to family planning during a pandemic is a social response to stress, not a side effect of a syringe.”
Furthermore, medical professionals emphasize that the true threat to fertility and pregnancy health is the virus itself.
“Present scientific evidence is clear that the protection against severe disease a Covid-19 shot provides clearly outweighs possible risks,” says Prof. Timpka.
Research has consistently shown that COVID-19 infection during pregnancy increases the risk of preterm birth, stillbirth, and severe maternal illness. Vaccination, by contrast, provides a protective buffer for both the mother and the developing fetus.
Limitations and Nuance
While the study is expansive, researchers acknowledge certain limitations. The data relies on “registered” miscarriages; very early pregnancy losses that occur before a person seeks medical care may not be captured in health records. Additionally, the study focused on mRNA vaccines (Pfizer-BioNTech and Moderna), which were the primary options in Sweden, meaning the results may not directly apply to other vaccine platforms like viral vector or protein-subunit vaccines used in other regions.
However, the sheer volume of the data—covering four years of real-world outcomes—provides a level of reassurance that smaller clinical trials cannot match.
Practical Implications for Readers
For women and couples planning to start a family, the message from the medical community is one of encouragement.
“Women who want to start a family and who are on the fence about whether to get a Covid-19 shot should not hesitate about having the vaccine,” Timpka urged.
Choosing vaccination is now viewed by many experts as a proactive step in “pre-conception care,” similar to taking folic acid or quitting smoking. By preventing severe illness during a potential pregnancy, the vaccine serves as a safeguard for reproductive health rather than a hindrance.
As we move further from the peak of the pandemic, studies like this serve as a vital tool in dismantling misinformation and restoring trust in preventive medicine.
References
- https://tennews.in/covid-vaccine-not-linked-to-decrease-in-fertility-study/
Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Always consult with qualified healthcare professionals before making any health-related decisions or changes to your treatment plan. The information presented here is based on current research and expert opinions, which may evolve as new evidence emerges.
