The CDC (Center for Disease Control) and ACOG (The American College Of Obstetrics and Gynecology) recommend that all women, including those who are pregnant, receive the seasonal flu vaccine. No study to date has shown an adverse consequence of inactivated influenza vaccine in pregnant women or their offspring. Vaccination early in the season and regardless of gestational age is optimal, but unvaccinated pregnant women should be immunized at any time during influenza season as long as the vaccine supply lasts.