There is no need to postpone polio vaccination after hepatitis B vaccination, but both must not be shorter than 1 month. The normal time for hepatitis B vaccination is 0 months, 1 month and 6 months after birth. If the vaccination is postponed for various reasons, it can generally be done within 3 months of age. If it is more than 3 months later, liver function and hepatitis B five items need to be retested, and if there is no abnormality, the vaccination will be done again according to the procedure of 0 month, 1 month and 6 months. Polio is for the prevention of poliomyelitis and is administered at the age of 2 months, 3 months and 4 months, with a booster at the age of 4. The two cannot be administered at the same time, but polio vaccine is not subject to the special restrictions of hepatitis B vaccine.