Catch-up vaccination:  The maximum age for the first dose in the series is 14 weeks, 6 days.  Vaccination should not be initiated for infants aged 15 weeks 0 days or older.  The maximum age for the final dose in the series is 8 months, 0 days.  If RV-1(Rotarix) is administered for the first and second doses, a third dose is not indicated.  For other catch-up issues, see Figure 2.
3. Diphtheria and tetanus toxoids and acellular pertussis (DTaP)  vaccine. (Minimum age: 6 weeks) Routine vaccination:  Administer a 5-dose series of DTaP vaccine at ages 2, 4, 6, 15–18  months, and 4 through 6 years. The fourth dose may be administered as  early as age 12 months, provided at least 6 months have elapsed since  the third dose. Catch-up vaccination:  The fifth (booster) dose of DTaP vaccine is not necessary if the fourth  dose was administered at age 4 years or older.  For other catch-up issues, see Figure 2.
4. Tetanus and diphtheria toxoids and acellular pertussis (Tdap) vaccine. (Minimum age: 10 years for Boostrix, 11 years for Adacel). Routine vaccination:  Administer 1 dose of Tdap vaccine to all adolescents aged 11 through 12  years.  Tdap can be administered regardless of the interval since the last tetanus  and diphtheria toxoid-containing vaccine.  Administer one dose of Tdap vaccine to pregnant adolescents during  each pregnancy (preferred during 27 through 36 weeks gestation)  regardless of number of years from prior Td or Tdap vaccination. Catch-up vaccination:  Persons aged 7 through 10 years who are not fully immunized with the  childhood DTaP vaccine series, should receive Tdap vaccine as the first  dose in the catch-up series; if additional doses are needed, use Td  vaccine. For these children, an adolescent Tdap vaccine should not be  given.  Persons aged 11 through 18 years who have not received Tdap vaccine  should receive a dose followed by tetanus and diphtheria toxoids (Td) booster doses every 10 years thereafter.  An inadvertent dose of DTaP vaccine administered to children aged 7  through 10 years can count as part of the catch-up series. This dose can  count as the adolescent Tdap dose, or the child can later receive a Tdap  booster dose at age 11–12 years.  For other catch-up issues, see Figure 2.