Getting the Tdap vaccine in the third trimester of pregnancy helps protect your baby from pertussis (whooping cough). After a pregnant women gets vaccinated, antibodies are passed to the baby that give protection until they are old enough to get vaccinated. In-person visits are limited due to #COVID19, but you can get your Tdap when you go into for other tests at the beginning of the third trimester. health.state.mn.us #NIIW