He stated flatly in the Huffington Post (a hotbed of medical misinformation) recently that pregnant women should not get the DTaP vaccine.

FORBES: Whooping Cough Epidemic: Blame The Anti-Vaccination Movement

The pertussis vaccine, called DTaP (diphtheria, tetanus, and pertussis) has been responsible for a dramatic drop in whooping cough in recent decades.

FORBES: Whooping Cough Epidemic: Blame The Anti-Vaccination Movement

Babies and children are vaccinated against pertussis, diphtheria and tetanus through a similar vaccine that's referred to as Dtap in a five-dose series during infancy and up to age 6.

WSJ: Panel Pushes Vaccine for Pregnant Women