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Friday, June 19, 2026

Association of COVID-19 vaccination before 12 weeks of gestation with ultrasound-detected congenital anomalies compared with later or no vaccination: A registry-based cohort study

A newly published registry-based cohort study has reported higher rates of specific serious birth defects among infants born to mothers vaccinated against COVID-19 during the critical first trimester of pregnancy (conception through approximately 12 weeks).

In the analysis of 1,352 pregnancies, researchers compared outcomes for mothers vaccinated early in pregnancy with those who were unvaccinated or vaccinated later.

Key findings include:

• Atrioventricular septal defects (AVSD)—a serious heart defect involving holes between the heart’s chambers—occurred in 2.3% of babies in the first-trimester vaccinated group, compared to 0% in the unvaccinated group.

• Cleft palate was observed in 0.8% of the exposed group, versus 0% in controls.

These conditions can require surgical intervention, ongoing medical care, and carry significant long-term implications for affected children.

The study examined inactivated whole-virus and viral-vector vaccines.

The author notes that mRNA platforms, widely used globally, were not included and may warrant separate scrutiny.

Despite these signals, major organizations including ACOG, SMFM, WHO, and various national health agencies continue to recommend COVID-19 vaccination during pregnancy.

While this is a single observational study and further research is essential to establish causality, the findings highlight the need for greater transparency, rigorous safety monitoring, and careful risk-benefit assessment—particularly for healthy individuals in early pregnancy.

Parents and healthcare providers deserve full informed consent based on the latest evidence.

This should prompt urgent calls for additional independent studies and a reevaluation of current guidelines.

Yet another Covid vaccine concern that should have been addressed before being recommended for pregnant women.