A large study has confirmed that maternal COVID-19 vaccination during pregnancy provides protection to infants against COVID-19 infection in their first few months of life. The research, published in the journal Pediatrics, analyzed data from over 140,000 infants. Babies under six months old currently have high hospitalization rates from COVID-19, and no vaccine is available for this age group. This study supports the American College of Obstetricians and Gynecologists' (ACOG) recommendation for COVID-19 vaccination during pregnancy.
Key Findings
Infants whose mothers were vaccinated during pregnancy were approximately half as likely to be hospitalized specifically for COVID-19 in their first two months of life compared to infants not exposed to the vaccine in utero.
- Between three and five months of age, the risk of a hospital visit for COVID-19 was 24% lower in infants whose mothers were vaccinated.
- The vaccine's protection against COVID-19 generally diminished after infants reached six months of age.
- The study found that COVID-19 vaccination during pregnancy did not increase the risk of other infections in children, contradicting claims made by some individuals regarding potential "immune dysregulation."
Study Details and Context
Researchers in Norway tracked 146,031 children born between March 2020 and December 2023, reviewing their medical records for up to two years after birth. Approximately one in four of these children had mothers who received a COVID-19 vaccine while pregnant.
Previous data from 2021 to 2023 indicated that pregnancy increased the risk of COVID-19 hospitalization and the need for ventilator support, prompting leading medical organizations like ACOG to recommend vaccination for pregnant individuals.
Health-Seeking Behavior
The study observed that babies whose mothers were vaccinated were about 5% more likely to see a doctor for an infection. However, further analysis suggested this increase was likely due to differences in health-seeking behaviors between vaccinated and unvaccinated mothers, rather than a biological effect of the vaccine. Individuals who choose to be vaccinated often demonstrate a higher propensity to seek medical care for their children.
Funding
The study was funded by the University of Oslo and a Scandinavian government agency, with no funding received from pharmaceutical companies.