For Adults: Starting May 2022, USCIS is requiring adults who are under 59 must have Hep B Vaccine Record. (Check USCIS website instructions about the vaccine for I-693, or you can check the link herehttps://www.cdc.gov/immigrantrefugeehealth/civil-surgeons/vaccinations.html)
Regarding the new policy published by USCIS, Starting July 25th, 2022, for children 6 months to 4 years of age, the primary series is either 3 doses of Pfizer BioTech (3-8weeks between the first and second dose, at least 8 weeks between the second dose and third doses), or 2 doses of Moderna (4-8weeks between the 2 doses). For kids above the age of 4, the primary shots are 2 of Pfizer/Moderna.
If you have any questions, please check the I-693 Instruction Page on USCIS Website.