No adverse event; HCP stated they had 12 patients from 6 months to 5 years not previously vaccinated, and accidentally they administered 2 doses 1 month apart (0.25 mL); This spontaneous case was reported by an other health professional and describes the occurrence of WRONG PRODUCT ADMINISTERED (HCP stated they had 12 patients from 6 months to 5 years not previously vaccinated, and accidentally they administered 2 doses 1 month apart (0.25 mL)) and NO ADVERSE EVENT (No adverse event) in a 15-month-old male patient who received mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) for COVID-19 prophylaxis.     Relevant medical history or conditions, allergy, concomitant diseases and risk factor were unknown.     On 27-Jul-2023, the patient received second dose of mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (unknown route) .25 milliliter. On 27-Jul-2023,  after starting mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)), the patient experienced WRONG PRODUCT ADMINISTERED (HCP stated they had 12 patients from 6 months to 5 years not previously vaccinated, and accidentally they administered 2 doses 1 month apart (0.25 mL)). On an unknown date, the patient experienced NO ADVERSE EVENT (No adverse event). At the time of the report, WRONG PRODUCT ADMINISTERED (HCP stated they had 12 patients from 6 months to 5 years not previously vaccinated, and accidentally they administered 2 doses 1 month apart (0.25 mL)) and NO ADVERSE EVENT (No adverse event) outcome was unknown.        For mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (Unknown), the reporter considered NO ADVERSE EVENT (No adverse event) to be not related. No further causality assessment was provided for WRONG PRODUCT ADMINISTERED (HCP stated they had 12 patients from 6 months to 5 years not previously vaccinated, and accidentally they administered 2 doses 1 month apart (0.25 mL)).    Patient did not receive any other vaccines in the 4 weeks prior to COVID-19 vaccine. Concomitant medication details not reported by the reporter. Treatment details was not reported by the reporter. This case contains information about 1st patient out of 12.   This case was linked to US-MODERNATX, INC.-MOD-2023-737363, US-MODERNATX, INC.-MOD-2023-737360, US-MODERNATX, INC.-MOD-2023-737361, US-MODERNATX, INC.-MOD-2023-737359, US-MODERNATX, INC.-MOD-2023-737216, US-MODERNATX, INC.-MOD-2023-737364, US-MODERNATX, INC.-MOD-2023-737534, US-MODERNATX, INC.-MOD-2023-737289, US-MODERNATX, INC.-MOD-2023-737358, US-MODERNATX, INC.-MOD-2023-737301, US-MODERNATX, INC.-MOD-2023-737519 (Linked Report).; Sender's Comments:  US-MODERNATX, INC.-MOD-2023-737363:Patient 2 US-MODERNATX, INC.-MOD-2023-737360:Patient 3 US-MODERNATX, INC.-MOD-2023-737361:Patient 4 US-MODERNATX, INC.-MOD-2023-737359:Patient 5 US-MODERNATX, INC.-MOD-2023-737216:Patient 6 US-MODERNATX, INC.-MOD-2023-737364:Patient 7 US-MODERNATX, INC.-MOD-2023-737534:Patient 9 US-MODERNATX, INC.-MOD-2023-737289:Patinet 10 US-MODERNATX, INC.-MOD-2023-737358:Patient 11 US-MODERNATX, INC.-MOD-2023-737301:Patient 8 US-MODERNATX, INC.-MOD-2023-737519:Patient 12