Studies have found no increased chance for pregnancy or newborn complications, such as stillbirth, preterm delivery (before 37 weeks of pregnancy), babies born smaller than expected, low Apgar scores, neonatal intensive care unit admission, or neonatal death, when a COVID-19 vaccine is given anytime during pregnancy. The majority of women in these studies received mRNA vaccines (Moderna/Spikevax® or Pfizer/Comirnaty®).