A nurse is caring for several clients who are receiving well-child check-ups. The nurse should identify that the initial diphtheria, tetanus, and pertussis (DTaP) vaccine is indicated for which of the following clients?

The initial diphtheria, tetanus, and pertussis (DTaP) vaccine is indicated for a 2-month-old infant. The DTaP vaccine is typically administered as a series of doses starting in infancy to provide protection against diphtheria, tetanus, and pertussis (whooping cough). The recommended schedule for the DTaP vaccine includes a series of doses at 2, 4, and 6 months of age, with additional booster doses given later in childhood. Therefore, the first dose of DTaP is given to infants at 2 months of age. The other options are incorrect because: b) A 4-month-old infant: By 4 months of age, the second dose of the DTaP vaccine should be administered, not the initial dose. c) A 6-month-old infant: By 6 months of age, the third dose of the DTaP vaccine should be administered, not the initial dose. d) A 15-month-old toddler: By 15 months of age, the toddler would have already received multiple doses of the DTaP vaccine as part of the recommended series. The initial dose is typically given earlier, at 2 months of age.