evidence: CDC recommends routine DTaP vaccination for all infants and children younger than 7 years old. [...] CDC only recommends Tdap in the immediate postpartum period for women who've never received Tdap, including during - Adolescence - Adulthood - A previous or current pregnancy [...] Immunity to pertussis following Tdap vaccination wanes after a few years. However, there's no recommendation to administer booster doses to maintain protection against pertussis.