Diptheria/Tetanus/Pertussis (dTap) Vaccine
Tdap is only for children 7 years and older, adolescents, and adults.
Adolescents should receive a single dose of Tdap, preferably at age 11 or 12 years.
Pregnant people should get a dose of Tdap during every pregnancy, preferably during the early part of the third trimester, to help protect the newborn from pertussis. Infants are most at risk for severe, life-threatening complications from pertussis.
Adults who have never received Tdap should get a dose of Tdap.
Also, adults should receive a booster dose of either Tdap or Td (a different vaccine that protects against tetanus and diphtheria but not pertussis) every 10 years, or after 5 years in the case of a severe or dirty wound or burn.
Source: CDC