Can Pediarix (DTaP-HepB-IPV) be used in infants and children who have fallen behind?

Yes. As with any combination vaccine, it may be used when any of the components are indicated and none are contraindicated. Providers must observe spacing intervals such that the minimum interval between doses is equal to the greatest interval of any of the individual antigens. Pediarix may only be used in children younger than age 7 years.