<prompt> Risk of the damage to fetus by material rubella is maximum if mother gets infected in -6-12 weeks of pregnancy6-12 weeks of pregnancy6-12 weeks of pregnancy6-12 weeks of pregnancy  <response>: If rubella occurs in very early pregnancy the fetus may die. Congenital malformation are commonest during the first trimester 1st 12 wk REF:ANANTHANARYANAN TTEXTBOOKOF MICROBIOLOGY 9EDITION PGNO.555 