Hepatitis B (Hep B): This is a series of three vaccines to protect against hepatitis B. Within the US, all babies should receive this vaccination within their first year. The first is usually given shortly after birth in the hospital, the second should be given between one and two months of age, and the third at six months.
If a combination vaccine is given (for example: Hep B/DTaP/IPV in one), then the third dose may be given at four months and a fourth at six months. Older adolescents may not have received this series beginning at birth and may need a catch-up series.