How long can the second dose of neonatal hepatitis B vaccine be delayed

The second dose of hepatitis B vaccine for newborns should not be delayed for 1 month at the latest. The second dose of

hepatitis B vaccine for newborns generally needs to be injected according to the immunization procedures of 0, 1 and 6 months. only within the specified time can the vaccination be obtained. In theory, it needs to be injected one month after the first dose. If the vaccination cannot be completed within the specified time due to diseases or other special circumstances, it can be postponed appropriately in this case, but it should not be delayed for 1 month at the latest.

If there are no special circumstances, it is recommended that parents take their children for vaccination at the specified time to improve the vaccination effect.