Women who were vaccinated for COVID-19 earlier in their third trimester had a higher likelihood of passing protective antibodies to their newborn babies than women who received their vaccination closer to delivery, a new Northwestern Medicine study has found. The scientists analyzed the blood of 27 pregnant women who had received either the Pfizer or Moderna vaccine in their third trimester and the umbilical cord blood of their 28 newborns (26 singletons, one set of twins).