Inclusion Criteria:  Currently pregnant The outcome of pregnancy (that is, pregnancy loss or live birth) must not be known at entry. Agrees to electronically sign the release of medical information form permitting the study to contact her HCPs (for example, primary care provider [PCP], obstetrician, nurse midwife) and the infant's HCP (for example, pediatrician) for medical information. Received the Moderna COVID-19 vaccine at any point from 28 days prior to last menstrual period (LMP) throughout pregnancy.  Exclusion Criteria:  Participant has received any other COVID-19 vaccines at any point from 28 days prior to LMP throughout pregnancy. Women currently participating in another investigational device or drug study, currently taking an investigational medicinal product, or having taken an investigational product within 28 days prior to LMP or during pregnancy.