it came from here:The risk of congenital defects has been reported to be 90% when maternal infection occurs before 11 weeks of gestation, 33% at 11–12 weeks, 11% at 13–14 weeks, 24% at 15–16 weeks, and 0% after 16 weeks. Therefore, the risk of congenital defects after maternal infection is essentially limited to the first 16 weeks of gestation. Little, if any, risk of CRS is associated with infection beyond 20 weeks