<prompt> Risk of damage to the fetus by maternal rubella is maximum if a mother gets infected in6 - 12 weeks of pregnancy20 - 24 weeks of pregnancy24 - 28 weeks of pregnancy32 - 36 weeks of pregnancy  <response>: The first trimester of pregnancy is the most disastrous time - results in abnormalities in the infant in 85 of cases.16 in the second trimester.Bih defects uncommon after 20 weeks of gestation.Park 23e pg: 145 