Vaginal spotting on and off after first shot; Mild fever after first shot; Body ache after first shot; Breastfeeding before and after first shot; This spontaneous case was reported by a consumer and describes the occurrence of VAGINAL HAEMORRHAGE (Vaginal spotting on and off after first shot), PYREXIA (Mild fever after first shot), MYALGIA (Body ache after first shot) and MATERNAL EXPOSURE DURING BREAST FEEDING (Breastfeeding before and after first shot) in a 23-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. Unknown) for COVID-19 vaccination.     No Medical History information was reported.    On 04-Oct-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 04-Oct-2021, the patient experienced VAGINAL HAEMORRHAGE (Vaginal spotting on and off after first shot), PYREXIA (Mild fever after first shot), MYALGIA (Body ache after first shot) and MATERNAL EXPOSURE DURING BREAST FEEDING (Breastfeeding before and after first shot). On 04-Oct-2021, MATERNAL EXPOSURE DURING BREAST FEEDING (Breastfeeding before and after first shot) had resolved. On 07-Oct-2021, PYREXIA (Mild fever after first shot) and MYALGIA (Body ache after first shot) had resolved. On 01-Nov-2021, VAGINAL HAEMORRHAGE (Vaginal spotting on and off after first shot) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 04-Oct-2021, Body temperature: high (High) High.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       Concomitant and treatment medication were not provided by the reporter.  Company comment: This case concerns a 23 year old female , with no reported medical history,  who experienced non-serious event of Maternal Exposure during breast feeding which occurred on the same day after vaccination with the 1st dose of mRNA-1273 vaccine (Moderna Covid 19 Vaccine) . She also experienced non-serious , unexpected event of vaginal hemorrhage and expected events of pyrexia and myalgia which occurred n an unknown date after vaccination with the 1st dose of mRNA  - 1273 vaccine (Moderna Covid 19 vaccine) . The re-challenge for this case is positive for the events  fever, myalgia and vaginal hemorrhage since these events recurred after the vaccination with the 2nd dose as documented in the system. The benefit-risk relationship of mRNA-1273 vaccine (Moderna Covid 19 Vaccine ) is not affected by this report.   This case was linked to MOD-2021-375571 (Patient Link).; Sender's Comments: This case concerns a 23 year old female , with no reported medical history,  who experienced non-serious event of Maternal Exposure during breast feeding which occurred on the same day after vaccination with the 1st dose of mRNA-1273 vaccine (Moderna Covid 19 Vaccine) . She also experienced non-serious , unexpected event of vaginal hemorrhage and expected events of pyrexia and myalgia which occurred n an unknown date after vaccination with the 1st dose of mRNA  - 1273 vaccine (Moderna Covid 19 vaccine) . The re-challenge for this case is positive for the events  fever, myalgia and vaginal hemorrhage since these events recurred after the vaccination with the 2nd dose as documented in the system. The benefit-risk relationship of mRNA-1273 vaccine (Moderna Covid 19 Vaccine ) is not affected by this report.