Fifty-six (56) per cent of neonates of women with active rubella infection were Rubella IgM seropositive at birth, and 14.3% of the neonates of Rubella IgM seropositive pregnant women with active rubella infection had occipitofrontal circumference of less than 10th percentile for gestational age. The gene discussed is CD40LG; the disease is rubella.