has been refreshed! Take a tour.
  • Diphtheria
  • Scheduling Vaccines
  • Pertussis
  • Scheduling Vaccines
  • Tetanus
  • Scheduling Vaccines

If a child didn’t have the recommended 6-month interval between DTaP doses #3 and #4, should it be repeated?

If DTaP #4 is given with at least a 4-month interval after DTaP #3, it does not need to be repeated. The minimum age of 12 months for the fourth dose must be met. Decreasing the interval to less than 6 months, however, is not recommended.

Last reviewed: March 31, 2022

This page was updated on .