evidence: DTaP is a vaccine that protects children from three serious infectious diseases caused by bacteria: diphtheria (D), tetanus (T), and pertussis (aP). [...] The DTaP vaccine is only for use in infants and young children. Pregnant women shouldn’t receive the DTaP vaccine. [...] The DTaP vaccine is given to infants and young children in five doses and protects against three infectious diseases: diphtheria, tetanus, and pertussis. Infants should receive their first dose at 2 months of age.