COVID-19 mRNA vaccines are extremely effective at protecting pregnant and lactating women against the virus, and likely provide protection for their babies as well, according to a study published March 25 in the American Journal of Obstetrics and Gynecology.

Researchers at Massachusetts General Hospital and Brigham and Women’s Hospital, both in Boston, examined data from 131 vaccine recipients, including 84 who were pregnant, 31 who were breastfeeding and 16 who weren’t pregnant.

The study is the largest to date to examine the responses of pregnant and lactating women to COVID-19 vaccines.

Participants received vaccines produced by either Pfizer or Moderna, both of which are mRNA vaccines.

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