COVID-19 vaccination can prompt a vigorous immune response in pregnant women, who then pass the resulting antibodies on to their newborns through the placenta and breast milk, according to a study published yesterday in the American Journal of Obstetrics and Gynecology.Led by researchers at Brigham and Women's Hospital and Massachusetts General Hospital, who call it the largest such study yet, the prospective analysis involved the blood and breast milk of 131 women of reproductive age, including 84 pregnant, 31 lactating, and 16 nonpregnant participants, who received two doses of either the Pfizer/BioNTech or Moderna mRNA COVID-19 vaccine from Dec 17, 2020, to Mar 2, 2021.Blood and breast milk samples were collected at the time of the