Disruptions in normal brain growth suggests that also may be the cause of ASD, since those disruptions can defect the genes that controls the brain development and regulate how brain cells communicate with each others
Mother's who had a child with ASD is more likely that if she have a second one, the chances are one in 20 that will have ASD as well. In identical twins is more likely that both siblings have ASD than twins that are fraternal.
A higher chance for boys being diagnosed with ASD than girls, four times higher.
Paternal age, the mother age appear